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Literatura académica sobre el tema "Shewanellae"

Autor: Grafiati

Publicado: 11 de marzo de 2023

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Artículos de revistas sobre el tema "Shewanellae"

Yin, Jianhua y Haichun Gao. "Stress Responses ofShewanella". International Journal of Microbiology 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/863623.

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The shewanellae are ubiquitous in aquatic and sedimentary systems that are chemically stratified on a permanent or seasonal basis. In addition to their ability to utilize a diverse array of terminal electron acceptors, the microorganisms have evolved both common and unique responding mechanisms to cope with various stresses. This paper focuses on the response and adaptive mechanism of the shewanellae, largely based on transcriptional data.

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Marritt, Sophie J., Thomas G. Lowe, Jordan Bye, Duncan G. G. McMillan, Liang Shi, Jim Fredrickson, John Zachara et al. "A functional description of CymA, an electron-transfer hub supporting anaerobic respiratory flexibility in Shewanella". Biochemical Journal 444, n.º 3 (29 de mayo de 2012): 465–74. http://dx.doi.org/10.1042/bj20120197.

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CymA (tetrahaem cytochrome c) is a member of the NapC/NirT family of quinol dehydrogenases. Essential for the anaerobic respiratory flexibility of shewanellae, CymA transfers electrons from menaquinol to various dedicated systems for the reduction of terminal electron acceptors including fumarate and insoluble minerals of Fe(III). Spectroscopic characterization of CymA from Shewanella oneidensis strain MR-1 identifies three low-spin His/His co-ordinated c-haems and a single high-spin c-haem with His/H2O co-ordination lying adjacent to the quinol-binding site. At pH 7, binding of the menaquinol analogue, 2-heptyl-4-hydroxyquinoline-N-oxide, does not alter the mid-point potentials of the high-spin (approximately −240 mV) and low-spin (approximately −110, −190 and −265 mV) haems that appear biased to transfer electrons from the high- to low-spin centres following quinol oxidation. CymA is reduced with menadiol (Em=−80 mV) in the presence of NADH (Em=−320 mV) and an NADH–menadione (2-methyl-1,4-naphthoquinone) oxidoreductase, but not by menadiol alone. In cytoplasmic membranes reduction of CymA may then require the thermodynamic driving force from NADH, formate or H2 oxidation as the redox poise of the menaquinol pool in isolation is insufficient. Spectroscopic studies suggest that CymA requires a non-haem co-factor for quinol oxidation and that the reduced enzyme forms a 1:1 complex with its redox partner Fcc3 (flavocytochrome c3 fumarate reductase). The implications for CymA supporting the respiratory flexibility of shewanellae are discussed.

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Pinchuk, Grigoriy E., Christine Ammons, David E. Culley, Shu-Mei W. Li, Jeff S. McLean, Margaret F. Romine, Kenneth H. Nealson, Jim K. Fredrickson y Alexander S. Beliaev. "Utilization of DNA as a Sole Source of Phosphorus, Carbon, and Energy by Shewanella spp.: Ecological and Physiological Implications for Dissimilatory Metal Reduction". Applied and Environmental Microbiology 74, n.º 4 (21 de diciembre de 2007): 1198–208. http://dx.doi.org/10.1128/aem.02026-07.

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ABSTRACT The solubility of orthophosphate (PO4 3−) in iron-rich sediments can be exceedingly low, limiting the bioavailability of this essential nutrient to microbial populations that catalyze critical biogeochemical reactions. Here we demonstrate that dissolved extracellular DNA can serve as a sole source of phosphorus, as well as carbon and energy, for metal-reducing bacteria of the genus Shewanella. Shewanella oneidensis MR-1, Shewanella putrefaciens CN32, and Shewanella sp. strain W3-18-1 all grew with DNA but displayed different growth rates. W3-18-1 exhibited the highest growth rate with DNA. While strain W3-18-1 displayed Ca2+-independent DNA utilization, both CN32 and MR-1 required millimolar concentrations of Ca2+ for growth with DNA. For S. oneidensis MR-1, the utilization of DNA as a sole source of phosphorus is linked to the activities of extracellular phosphatase(s) and a Ca2+-dependent nuclease(s), which are regulated by phosphorus availability. Mass spectrometry analysis of the extracellular proteome of MR-1 identified one putative endonuclease (SO1844), a predicted UshA (bifunctional UDP-sugar hydrolase/5′ nucleotidase), a predicted PhoX (calcium-activated alkaline phosphatase), and a predicted CpdB (bifunctional 2′,3′ cyclic nucleotide 2′ phosphodiesterase/3′ nucleotidase), all of which could play important roles in the extracellular degradation of DNA under phosphorus-limiting conditions. Overall, the results of this study suggest that the ability to use exogenous DNA as the sole source of phosphorus is widespread among the shewanellae, and perhaps among all prokaryotes, and may be especially important for nutrient cycling in metal-reducing environments.

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Lee, On On, Stanley C. K. Lau, Mandy M. Y. Tsoi, Xiancui Li, Ioulia Plakhotnikova, Sergey Dobretsov, Madeline C. S. Wu, Po-Keung Wong, Markus Weinbauer y Pei-Yuan Qian. "Shewanella irciniae sp. nov., a novel member of the family Shewanellaceae, isolated from the marine sponge Ircinia dendroides in the Bay of Villefranche, Mediterranean Sea". International Journal of Systematic and Evolutionary Microbiology 56, n.º 12 (1 de diciembre de 2006): 2871–77. http://dx.doi.org/10.1099/ijs.0.64562-0.

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Strain UST040317-058T, comprising non-pigmented, rod-shaped, facultatively anaerobic, Gram-negative cells that are motile by means of single polar flagella, was isolated from the surface of a marine sponge (Ircinia dendroides) collected from the Mediterranean Sea. Comparative 16S rRNA gene sequence-based phylogenetic analysis placed the strain in a separate cluster with the recognized bacterium Shewanella algae IAM 14159T, with which it showed a sequence similarity of 95.0 %. The sequence similarity between strain UST040317-058T and its other (six) closest relatives ranged from 91.6 to 93.8 %. Strain UST040317-058T showed oxidase, catalase and gelatinase activities. The typical respiratory quinones for shewanellas, menaquinone MK-7 and ubiquinones Q-7 and Q-8, were also detected. The predominant fatty acids in strain UST040317-058T were i15 : 0, 16 : 0, 17 : 1ω8c and summed feature 3 (comprising i15 : 0 2-OH and/or 16 : 1ω7c), altogether representing 56.9 % of the total. The DNA G+C content was 39.9 mol%. The strain could be differentiated from other Shewanella species by its inability to reduce nitrate or produce H2S and by 10–22 additional phenotypic characteristics. On the basis of the phylogenetic and phenotypic data presented in this study, strain UST040317-058T represents a novel species in the genus Shewanella, for which the name Shewanella irciniae sp. nov. is proposed. The type strain is UST040317-058T (=JCM 13528T=NRRL B-41466T).

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Du, Guangqing, Yuanming Gai, Hui Zhou, Shaoping Fu y Dawei Zhang. "Assessment of Spoilage Microbiota of Rainbow Trout (Oncorhynchus mykiss) during Storage by 16S rDNA Sequencing". Journal of Food Quality 2022 (30 de marzo de 2022): 1–10. http://dx.doi.org/10.1155/2022/5367984.

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Due to the high contents of protein and fat in rainbow trout, it is highly susceptible to spoilage, which limits the storage and transportation processes. Exploring the spoilage microbial community during rainbow trout storage is essential to develop an effective preservation method. Here, the changes in the total bacterial colony and total volatile base nitrogen (TVB-N) during the storage of rainbow trout were investigated. Storage at 0 °C can effectively slow down the spoilage process with bacterial counts and TVB-N contents decreased from 8.7 log CFU/g and 18.7 mg/100 g obtained at 4 °C to 5.6 log CFU/g and 14.5 mg/100 g, respectively. 16S rDNA high-throughput sequencing results showed that the diversity of microbial genera decreased during storage. Acinetobacter, Pseudomonas, and Shewanells gradually became the dominant spoilage genera with contents of 59.9%, 18.6%, and 1.7%, respectively, in the late stage of storage. The spoilage abilities of bacteria belonging to the Pseudomonas and Shewanells genera were analyzed. Shewanella sp. S5-52 showed the highest level of TVB-N content (100.6 mg/100 g) in sterile fish juice, indicating that it had a strong spoilage ability. This study confirmed the dominant spoilage bacterial genera and evaluated the spoilage abilities of isolated strains during the storage of rainbow trout, which laid the foundation for further investigation of the spoilage mechanism of rainbow trout and other aquatic products.

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Jiang, Shenghua, Ji-Hoon Lee, Min-Gyu Kim, Nosang V. Myung, James K. Fredrickson, Michael J. Sadowsky y Hor-Gil Hur. "Biogenic Formation of As-S Nanotubes by Diverse Shewanella Strains". Applied and Environmental Microbiology 75, n.º 21 (28 de agosto de 2009): 6896–99. http://dx.doi.org/10.1128/aem.00450-09.

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ABSTRACT Shewanella sp. strain HN-41 was previously shown to produce novel, photoactive, As-S nanotubes via the reduction of As(V) and S2O3 2− under anaerobic conditions. To determine if this ability was unique to this bacterium, 10 different Shewanella strains, including Shewanella sp. strain HN-41, Shewanella sp. strain PV-4, Shewanella alga BrY, Shewanella amazonensis SB2B, Shewanella denitrificans OS217, Shewanella oneidensis MR-1, Shewanella putrefaciens CN-32, S. putrefaciens IR-1, S. putrefaciens SP200, and S. putrefaciens W3-6-1, were examined for production of As-S nanotubes under standardized conditions. Of the 10 strains examined, three formed As-S nanotubes like those of strain HN-41. While Shewanella sp. strain HN-41 and S. putrefaciens CN-32 rapidly formed As-S precipitates in 7 days, strains S. alga BrY and S. oneidensis MR-1 reduced As(V) at a much lower rate and formed yellow As-S after 30 days. Electron microscopy, energy-dispersive X-ray spectroscopy, and extended X-ray absorption fine-structure spectroscopy analyses showed that the morphological and chemical properties of As-S formed by strains S. putrefaciens CN-32, S. alga BrY, and S. oneidensis MR-1 were similar to those previously determined for Shewanella sp. strain HN-41 As-S nanotubes. These studies indicated that the formation of As-S nanotubes is widespread among Shewanella strains and is closely related to bacterial growth and the reduction rate of As(V) and thiosulfate.

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Yang, Sung-Hyun, Kae Kyoung Kwon, Hee-Soon Lee y Sang-Jin Kim. "Shewanella spongiae sp. nov., isolated from a marine sponge". International Journal of Systematic and Evolutionary Microbiology 56, n.º 12 (1 de diciembre de 2006): 2879–82. http://dx.doi.org/10.1099/ijs.0.64540-0.

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A psychrophilic bacterium, designated strain HJ039T, was isolated from a marine sponge collected in the East Sea of Korea (also known as the Sea of Japan). Cells were Gram-negative, motile and rod-shaped (1.8–3.54 μm×0.27–0.73 μm). Growth was observed between 5 and 26 °C (optimum 15 °C), at pH 5.0–8.5 (optimum pH 6.0–6.5) and in the presence of 0–6.0 % NaCl (optimum 2.0 %). The 16S rRNA gene sequence of strain HJ039T showed high levels of similarity (93.7–95.4 %) with members of the genus Shewanella, especially with Shewanella gaetbuli TF-27T (95.2 %), Shewanella decolorationis S12T (94.9 %), Shewanella putrefaciens LMG 26268T (94.6 %), Shewanella hafniensis P010T (94.6 %), Shewanella algae ATCC 51192T (94.5 %) and Shewanella kaireitica c931T (94.5 %). However, phylogenetic analysis revealed that strain HJ039T shared a phyletic line with S. algae and Shewanella amazonensis. The major respiratory quinone was Q-8. The DNA G+C content was 52.8 mol%. The major fatty acids were i-13 : 0 (8.5 %), 15 : 0 (4.2 %), i-15 : 0 (23.2 %), i-15 : 1 (7.9 %), 16 : 0 (8.7 %), 16 : 1ω7 (21.0 %) and 17 : 1ω8 (6.4 %). From this polyphasic taxonomic evidence, strain HJ039T is considered to represent a novel species of the genus Shewanella, for which the name Shewanella spongiae sp. nov. is proposed. The type strain is HJ039T (=KCCM 42304T=JCM 13830T).

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Latif, Azka, Vikas Kapoor, Renuga Vivekanandan y Joseph Thilumala Reddy. "A rare case of Shewanella septicemia: risk factors, environmental associations and management". BMJ Case Reports 12, n.º 9 (septiembre de 2019): e230252. http://dx.doi.org/10.1136/bcr-2019-230252.

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Shewanella species are Gram-negative, saprophytic, motile bacilli. Exposure to aquatic environment and raw fish ingestion have been defined as significant associated risk factors. The two species most commonly associated with human infections are Shewanella algae and Shewanella putrefaciens and major portion of infections (80%) caused by the former. Herein, we report a case of Shewanella septicaemia in a 70-year-old man in Omaha, NE who had no exposure to aquatic environment. To date, no defined treatment guidelines are present due to rarity of Shewanella infections, which is contributing to emerging antibiotic resistance.

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Zhao, Jian-Shen, Dominic Manno, Chantale Beaulieu, Louise Paquet y Jalal Hawari. "Shewanella sediminis sp. nov., a novel Na+-requiring and hexahydro-1,3,5-trinitro-1,3,5-triazine-degrading bacterium from marine sediment". International Journal of Systematic and Evolutionary Microbiology 55, n.º 4 (1 de julio de 2005): 1511–20. http://dx.doi.org/10.1099/ijs.0.63604-0.

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Previously, a psychrophilic rod-shaped marine bacterium (strain HAW-EB3T) isolated from Halifax Harbour sediment was noted for its ability to degrade hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). In the present study phenotypic, chemotaxonomic and genotypic characterization showed that strain HAW-EB3T represents a novel species of Shewanella. Strain HAW-EB3T contained lysine decarboxylase, which is absent in other known Shewanella species, and distinguished itself from most other species of Shewanella by the presence of arginine dehydrolase, ornithine decarboxylase and chitinase, and by its ability to oxidize and ferment N-acetyl-d-glucosamine. Strain HAW-EB3T grew on several carbon sources (N-acetyl-d-glucosamine, Tween 40, Tween 80, acetate, succinate, butyrate and serine) and showed distinctive fatty acid and quinone compositions. Both phenotypic and 16S rRNA gene phylogenetic cluster analyses demonstrated that HAW-EB3T belongs to the Na+-requiring group of Shewanella species. The HAW-EB3T 16S rRNA gene sequence displayed ⩽97·4 % similarity to all known Shewanella species and was most similar to those of two bioluminescent species, Shewanella hanedai and Shewanella woodyi. However, gyrB of strain HAW-EB3T was significantly different from those of other Shewanella species, with similarities less than 85 %. DNA-DNA hybridization showed that its genomic DNA was less than 25 % related to that of S. hanedai or S. woodyi. Therefore we propose Shewanella sediminis sp. nov., with HAW-EB3T (=NCIMB 14036T=DSM 17055T) as the type strain.

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Huang, Jiexun, Baolin Sun y Xiaobo Zhang. "Shewanella xiamenensis sp. nov., isolated from coastal sea sediment". International Journal of Systematic and Evolutionary Microbiology 60, n.º 7 (1 de julio de 2010): 1585–89. http://dx.doi.org/10.1099/ijs.0.013300-0.

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A Gram-negative, motile, rod-shaped bacterium, strain S4T, was isolated from coastal sediment collected off Xiamen, China. The physiological and biochemical features of strain S4T, determined using the API 20NE, API ZYM and Biolog GN2 systems, were similar to those of members of the genus Shewanella. Phylogenetic analyses based on 16S rRNA and gyrB gene sequences placed strain S4T in the genus Shewanella, and it was most closely related to Shewanella oneidensis and related species. DNA–DNA hybridization demonstrated only 11.9–30.4 % relatedness between S4T and the type strains of related Shewanella species. On the basis of phylogenetic and phenotypic characteristics, strain S4T is classified in the genus Shewanella as a representative of a distinct novel species, for which the name Shewanella xiamenensis sp. nov. is proposed. The type strain is S4T (=CCTCC M 209017T =JCM 16212T).

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Tesis sobre el tema "Shewanellae"

Black, Ann Charlotte. "Flavocytochrome c from Shewanella putrefaciens". Thesis, University of Edinburgh, 1991. http://hdl.handle.net/1842/10823.

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Flavocytochrome c, a multihaem cytochrome from Shewanella putrefaciens induced under anaerobic conditions, was studied to investigate the physiological function of this protein. These studies comprised two facets: the cloning and sequence analysis of the structural gene for flavocytochrome c and a biochemical study of the fumarate reductase activity associated with flavocytochrome c. A S. putrefaciens genomic library was constructed in the expression vector pEX3. This library was screened in E. coli MM294 by colony hybridization of induced recombinants with antibody raised to purified flavocytochrome c protein. One clone giving a strong signal to antibody was identified from this library. Restriction digests of this recombinant showed the insert DNA to be approximately 1.5 kb. Southern blot analysis of the clone gave hybridization of flavocytochrome c antibody to a protein of approximately 45 kDa which was encoded by the recombinant pEX3 vector. This cloned fragment was proposed to encode part of the flavocytochrome c gene and investigated in more detail. The 1.5 kb cloned fragment was partially sequenced and mapped. Sequencing yielded two non-overlapping contigs of 438 bp and 966 bp respectively. The DNA fragment joining the two contigs remained unsequenced. Database analysis showed that the second contig contained 4 conserved c-type haem binding site motifs CXYCH within the first 90 residues. A second region in this contig from bases 123-151 was found to be completely homologous with a highly conserved FAD-binding fingerprint common to many flavoproteins. This molecular analysis strongly suggested that the cloned DNA fragment encoded at least 322 residues of the N-terminal region of the flavocytochrome c protein. This was further confirmed by the finding that the first 8 residues of the second contig were completely homologous with residues 6-13 of the N-terminal sequence of flavocytochrome c. Cloning the entire flavocytochrome c gene was attempted also by functional complementation of an E. coli fumarate reductase mutation.

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Morris, Christopher John. "C-type cytochromes of Shewanella putrefaciens". Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11195.

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Atanasiu, Doina. "Respiratory enzymes from Shewanella MR-1". Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/11653.

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Shewanella MR-1 is a Gram-negative, facultatively anaerobic bacterium isolated from Lake Oneida, New York. It can couple its anaerobic growth to the reduction of a wide variety of compounds such as nitrate, nitrite, TMAO, DMSO, fumarate, manganese(IV) and iron(III) oxides, sulfite and thiosulfate. Analysis of the genome sequence reveals the presence of a large number of respiratory enzymes. Three of these proteins were selected for further study: a decaheme cytochrome c, a heptaheme cytpchrome c and a flavoprotein. Decaheme 129 (Cyc129) is 37% similar to MtrC, a decaheme protein from the same organisms that have been shown to be involved in iron(III) and manganese(IV) respiration. The DNA sequence indicated the presence of a lipoprotein signal sequence but the protein is loosely associated to the membrane. Compared to the wild-type strain, no phenotypic differences were noted when the cyc129 gene was disrupted by the insertion of an antibiotic cassette. The second protein, heptaheme 202 (Cyc202) is a soluble, periplasmic protein and is the only heptaheme cytochrome c in Shewanella MR-1. Phenotypic studies indicate that it might be involved in the electron transport to the outer-membrane located iron-manganese reductases. FccA56 is similar to the flavin domain of flavocytochrome c₃, the fumarate reductase from Shewanella MR-1. The gene encoding this protein is part of a cluster that also encodes a tetraheme c-type cytochrome and a histidine ammonia lyase-like protein. Substitution of the highly conserved amino acids involved in substrate binding suggests that fumarate is not the physiological substrate of FcA56, but has a similar substrate that contains only one carboxylic group. The protein was purified after overexpression in E. coli. A UV-visible absorption spectrum confirmed that the ~52 kDa protein has absorption maxima at 450 and 380 nm, characteristic for flavoproteins.

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Zhang, Mengni. "Dissimilatory iron reduction: insights from the interaction between Shewanella oneidensis MR-1 and ferric iron (oxy)(hydr)oxide mineral surfaces". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37129.

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Dissimilatory iron reduction (DIR) is significant to the biogeochemical cycling of iron, carbon and other elements, and may be applied to bioremediation of organic pollutants, toxic metals, and radionuclides; however, the mechanism(s) of DIR and factors controlling its kinetics are still unclear. To provide insights into these questions, the interaction between a common dissimilatory iron reducing bacterium (DIRB)was studied, Shewanella oneidensis MR-1, and ferric iron (Fe(III)) (oxy)(hydr)oxide mineral surfaces. Firstly, atomic force microscopy was used to study how S. oneidensis MR-1 dissolved Fe(III) (oxy)(hydr)oxides and compared it to two other cases where Fe(III) (oxy)(hydr)oxides were either dissolved by a chemical reductant or by a mutant with an electron shuttling compound. Without the electron shuttling compound, the mutant is unable to respire on Fe(III) (oxy)(hydr)oxides, but with the electron shuttling compound, it can. It was found that the cells of S. oneidensis MR-1 formed microcolonies on mineral surfaces and dissolved the minerals in a non-uniform way which was consistent with the shape of microcolonies, whereas Fe(III) (oxy)(hydr)oxides were uniformly dissolved in both of the other cases. Secondly, confocal microscopy was used to study the adhesion behavior of S. oneidensis MR-1 cells on Fe(III) (oxy)(hydr)oxide surfaces across a broad range of bulk cell densities. While the cells were evenly distributed under low bulk cell densities, microcolonies were observed at high bulk cell densities. This adhesion behavior was modeled by a new, two-step adhesion isotherm which fit better than a simple Langmuir or Freundlich isotherm. The results of these studies suggest that DIR is in-part transport limited and the surface cell density may control DIR.

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Rothery, Emma L. "Mechanistic studies on multiheme cytochromes from Shewanella". Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/14338.

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Fumarate reduction in Shewanella is catalysed by a fumarate reductase known as flavocytochrome c₃ (Fcc₃). This enzyme consists of three domains: a cytochrome domain containing four c-type heme groups; a flavin domain containing a non-covalently bound FAD; and a mobile clamp domain. Fumarate is saccinate by hydride transfer from the flavin N5 and protonation by the active site acid, Arg402. Access of substrate to the active site in Fcc₃ was believed to be controlled by movement of the clamp domain. To test this assumption, site-directed mutagenesis has been used to create a disulfide bond between the clamp and flavin domains via the double mutation A251C:S430C. The disulfide bond in the mutant enzyme has been confirmed by both crystal structure and Ellman analysis. When the disulfide bond is formed both the steady-state and pre-steady-state rate constants for fumarate reduction fall to 25 and 30% of the wild-type values respectively whilst K_M values for fumarate are unaffected. Deuterium solvent kinetic isotope effects in the mutant enzyme are unchanged from wild-type (8.2 ±0.4 at pL 7.2), indicating that proton and/or hydride transfer is still rate-limiting. These results suggest that clamp domain mobility has little role in controlling fumarate reduction. The reduction of fumarate also requires the delivery of reducing equivalents to the active site. This is facilitated by the four bis-histidine-ligated heme groups within the cytochrome domain. Hemes I, II and III are solvent exposed and therefore able to collect electrons from the electron donor CymA, and deliver them to the FAD via heme IV. Mutations to His61, a ligand to the iron of heme IV, results in a lowering of both the steady-state and pre-steady-state rate constants for fumarate reduction (WT>H61Y>H61M>H61A). Crystal structures of H61A and H61M show that there is an exogenous ligand bound to the heme iron in both cases; acetate and water respectively.

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Gambari, Cyril. "Biogenèse de la pellicule chez Shewanella oneidensis". Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0218/document.

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La bactérie aquatique Shewanella oneidensis est capable, en condition statique et en présence d'oxygène, de former un biofilm à l'interface air-liquide, appelé pellicule. Mon travail a porté sur la biogenèse de la pellicule.Il a été montré dans le groupe que le régulateur de réponse du système chimiotactique, la protéine CheY3, était impliqué dans la biogenèse de la pellicule. Cette protéine est essentielle dans les étapes précoces et tardives de sa formation alors que son partenaire habituel, CheA3, semble ne jouer un rôle que dans les étapes tardives. Mon travail s'est focalisé sur la recherche de partenaires de CheY3.J'ai introduit une banque d'ADN génomique de S. oneidensis dans la souche ΔcheY3 et j'ai cherché des gènes dont la surexpression permettait de restaurer la formation de la pellicule. Cette approche a révélé deux gènes pdgA et pdgB. J'ai montré que les protéines PdgA et PdgB étaient capables de synthétiser du di-GMPc, suggérant que ce messager secondaire est impliqué dans la biogenèse de la pellicule. L'hydrolyse du di-GMPc par des enzymes dédiées empêche en effet sa formation.J'ai montré que l'opéron mxd, contrôlant la synthèse d'exopolysaccharides dans les biofilms de surface, était impliqué dans la formation de la pellicule. La première protéine codée par cet opéron, MxdA, est capable de lier le di-GMPc. Des expériences de pontage chimique et de double hybride ont révélé que MxdA, CheY3, PdgA et PdgB, formaient un réseau de régulation gouvernant la biogenèse de la pellicule.J'ai montré que les systèmes à deux composants BarA/UvrY et ArcS/ArcA contrôlant la transcription de l'opéron mxd sont aussi impliqués dans la formation du biofilm flottant
The aquatic bacterium Shewanella oneidensis is able to form, under static conditions and in the presence of oxygen, a biofilm at the air-liquid interface, called pellicle. My work was focused on the biogenesis of this pellicle.It was previously shown in the team that, surprisingly, the CheY3 protein, the response regulator of the chemotactic regulatory system, is involved in the biogenesis of the pellicle. This protein was shown to be essential both in early and late steps of pellicle formation whereas its usual partner, the kinase CheA3, seems to play a role in the late steps only. I was therefore looked for the partners of the CheY3 protein for pellicle formation.For this purpose, I have introduced a multi-copy genomic library in the ΔcheY3 strain and searched for genes whose overexpression allowed pellicle restoration. Strikingly, this approach revealed two genes pdgA and pdgB. Interestingly, we showed that PdgA and PdgB proteins are able to synthesize c-di-GMP, suggesting a role for this second messenger in pellicle biogenesis. Indeed, c-di-GMP hydrolysis by dedicated enzymes blocks pellicle formation.We also showed that the mxd operon, controlling the exopolysaccharides synthesis in biofilm associated with a solid surface, is also involved in pellicle formation. Moreover, the first protein encoded by this operon, MxdA, is able to bind c-di-GMP. Cross-linking and bacterial two-hybrid experiments revealed that MxdA, CheY3, PdgA and PdgB, form a complex regulatory pathway governing the biogenesis of the pellicle.Finally, we have shown that the two-component systems BarA/UvrY and ArcS/ArcA, controlling the mxd transcription, are also involved in pellicle formation

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Moule, Anne Louise. "The cell envelope of Alteromonas putrefaciens (Shewanella putrefaciens)". Thesis, University of Hull, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314672.

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Davies, Jonathan A. "Characterisation of the reversible formate dehydrogenases of Shewanella". Thesis, University of East Anglia, 2017. https://ueaeprints.uea.ac.uk/66856/.

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The reversible action of tungsten or molybdenum-containing formate dehydrogenase (FDH) enzymes in reducing CO2 to formate has been proposed for storing renewably produced electricity with concomitant CO2 sequestration. Previous attempts have highlighted the unfeasibility of using purified enzyme systems for biotechnological purposes. In response the possibility of using the exoelectrogenic bacteria Shewanella oneidensis in association with a cathode to drive intracellular CO2 reduction is proposed. Since the native FDH enzymes of S.oneidensis have not been previously studied, this work concerns their characterisation and directionality to inform both on native physiology and possible future biotechnological applications. This thesis demonstrates that the native FDH enzymes of S.oneidensis are capable of CO2 reductase activity. Both forward (Km 39 μM) and reverse (Km 1.43 mM) directions of FDH catalysis in whole cell cultures are maximal when cultured in the presence of W. When grown under such conditions, two FDH isoforms (Fdh1αβγ and Fdh2αβγ) contribute to these activities, with protein purification confirming Fdh2αβγ as a tungstoenzyme. CO2 reductase activity in S.oneidensis cultures could be driven by a cathode in simple three electrode electrochemical experiments without exogenous mediators with high coloumbic efficiency, representing an interesting paradigm for future inexpensive microbial electrosynthetic study.

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Bilsland, Morag. "Novel respiratory flavocytochromes of Shewanella oneidensis MR-1". Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/10812.

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Shewanella oneidensis MR-1 is a Gram-negative bacterium isolated from anaerobic freshwater lake sediments of Lake Oneida that exhibits remarkable respiratory versatility. In the absence of molecular oxygen, S. oneidensis MR-1 couples anaerobic growth to the reduction of various substrates, including ferric iron (FeIII), thiosulfate (S₂O₃^2-), sulfite (SO₃^2-), trimethylamine N-oxide (TMAO), nitrate (NO₃^-), nitrite (NO₂^-) and organic substrates such was fumarate. The metabolic flexibility of S. oneidensis MR-1 is coupled to a complex and branched anaerobic respiratory chain. The respiratory enzymes of the fumarate reduction pathway have been extensively studied in S. oneidensis MR-1 and the related marine bacterium, S. frigidimarina NCIMB400. The terminal fumarate reductase of Shewanella is a soluble periplasmic flavocytochrome c₃ (Fcc₃) that catalyses the unidirectional production of succinate. The X-ray crystal structure of Fcc₃ solved to high resolution provided the first detailed insight into the catalytic mechanism of fumarate reduction. In this work, the Fcc₃ X-ray crystal structure provided a structural template to construct homology models of related flavoenzymes of unknown structure and function. The novel flavoenzymes were identified by sequence analysis of the S. oneidensis MR-1 genome and were shown to comprise separately encoded flavin (FccA54, FccA56 and FccA342) and cytochrome subunits (FccB54, FccB56 and FccB342), respectively, that were related by sequence to the corresponding domains in Fcc₃. Molecular modelling of the catalytic flavin-binding subunits led to the suggestion that these related enzymes catalyse the reduction of acrylate-like substrates. Several biologically relevant plant metabolites, including phenylacrylates incorporated into lignin, were identified as potential substrates of the Fcc₃-like enzymes. An fccA54 and fccB54 knockout strain of S. oneidensis MR-1 (MB5415) was constructed and grown anaerobically with each of the candidate acrylates to ascertain the biological function of FccA54.

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Silva, Amanda Lys dos Santos. "Estudos ecogen?micos e bioprospectivos de Shewanella spp". Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16770.

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Bacteria trom Shewanella and Geobacter ganera are the most studied iron-reducing microorganisms particularly due to their electron transport systems and contribution to some industrial and environmental problems, including steel corrosion, bioenergy and bioremediation of petroleum-impacted sites. The present study was focused in two ways: the first is an in silico comparative ecogenomic study of Shewanella spp. with sequenced genomes, and the second is an experimental metagenomic work to detect iron-reducing Shewanella through PCR-DGGE of a metabolic gene. The in silico study resulted in positive correIation between copy number of 16S rDNA and genome size in Shewanella spp., with clusters of rrn near lhe origin of replication. This way, the genus is inferred as opportunist. There are no compact genomes and their sequences length varied, ranging from 4306142 nt in S. amazonensis SB2B to 5935403 nt in S. woodyi ATCC 51908, without correIation to temperature range characteristic of each specie. Intragenomic 16S rDNA sequences possess little divergence, but reasonable to resuIt in different phyIogenetic trees, depending on the sequence that is chosen to compare. For moIecuIar detection of iron-reducing Shewanella, it is proposed the mtrB gene as new biomarker. because it codes to a fundamental protein at Fe (III)-reduction. The specific primers were designed and evaluated in silico and resulted in a fragment of 360 pb. In the second study, these primers were tested in a genomic sample from S. oneidensis MR-1, amplifying the expected region. After this successfuI resuIt, the primer set was used as a tool to assess the iron-reducing communities of ShewaneIla genus under an environmental stress, i.e. crude oil contamination in mangrove sediment in Rio Grande do Norte State (Brazil). The primers presented high specificity and the reactions performed resulted in one single band of ampIification in the metagenomic samples. The fingerprinting obtained at DGGE reveaIed temporal variation of Shewanella spp. in analyzed samples. The resuIts presented show the detection of a biotechnological important group of microorganisms, the iron-reducing Shewanella spp. using a metabolic gane as target. It is concluded there are eight or more 16S rDNA sequences in Shewanella genus, with little divergence among them that affects the phylogeny; the pair of primers designed to ampIify mtrB sequences is a viable alternative to detect iron-reducing ShewanelIa in metagenomic approaches; such bacteria are present in the mangrove sediment anaIyzed, with temporal variations in the samples. This is the first experimental study that screened the iron-reducing Shewanella genus in a metagenomic experiment of mangrove sediments subjected to oil contamination through a key metabolic gene
Bact?rias dos g?neros Shewanella e Geobacter s?o os microrganismos redutores de ferro mais estudados. Esse interesse ocorre particularmente devido aos seus sistemas de transporte de el?trons e contribui??o em alguns problemas industriais e ambientais, tais como corros?o de oIeodutos, bioenergia e biorremedia??o de locais contaminados com petr?leo. O presente estudo foi tocado em duas partes: a primeira ? um estudo ecogen?mico comparativo de ShewanelIa spp. com genomas seq?enciados, e a segunda ? um trabalho metagen?mico experimental para detectar Shewanella redutoras de ferro atrav?s de PCR-DGGE de um gene metab?lico. O estudo in silico resultou em correla??o positiva entre o n?mero de c?pias 16S rDNA e tamanho do genoma em ShewaneIla spp., com agrupamentos de rrn. pr?ximo ? origem de replica??o. Desta maneira, o g?nero ? inferido como oportunista. N?o existem genomas compactos e o tamanho de suas sequ?ncias variam de 4306142 nt em S. amazonensis SB2B at? 5935403 nt em S. woodyi ATCC 51908, sem correla??o com a faixa de temperatura caracter?stica de cada esp?cie. Sequ?ncias intragen?micas de 16S rDNA possuem pouca diverg?ncia. mas razo?vel para resultar em diferentes ?rvores filogen?ticas. dependendo da sequ?ncia que ? escolhida para compara??o. Para a detec??o moIecuIar de ShewanelIa redutoras de ferro, ? proposto o gene mtrB como um novo biomarcador, por ser codante de uma prote?na fundamental na redu?ao de Fe (III). Os primers espec?ficos foram desenhados e avaliados in silico e resultou em um fragmento de 360 pb. No segundo estudo, esses primers foram testados em . amostra gen?mica de S. oneidensis MR-1, amplificando a regi?o esperada. Depois desse resultado favor?vel, o par de primers foi utilizado como ferramenta para acessar as comunidades redutoras de ferro do g?nero ShewanelIa sob um stress ambiental - contamina??o com ?leo cru em sedimento de mangue, no Estado do Grande do Norte (Brasil). Os primers apresentaram alta especificidade e as rea??es resultaram em banda ?nica de amplifica??o das amostras metagen?micas. O perfil obtido no DGGE revelou varia??o temporal de ShewanelIa spp. nas amostras analisadas. Os resultados apresentados mostram a defec??o de um grupo de microrganismos biotecnologicamente importante. ShewaneIla spp. redutoras de ferro, usando um gene metab?lico como alvo. Concluiu-se que existem oito ou mais sequ?ncias 16S rDNA no g?nero ShewaneIla, com pouca diverg?ncia entre elas que afetam a filogenia; o par de primers desenhados para amplificar sequ?ncias mtrB ? uma alternativa vi?vel para detectar Shewanella redutoras de ferro em abordagens metagen?micas; tais bact?rias est?o presentes no sedimento de mangue analisado, com varia??es temporais nas amostras. Este ? o primeiro estudo experimental que examina Shewanella redutoras de ferro em um experimento metagen?mico de sedimento de mangue submetido a contamina??o por ?leo atrav?s de um gene metab?lico

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Capítulos de libros sobre el tema "Shewanellae"

Fengler, Ingo. "Shewanella". En Lexikon der Infektionskrankheiten des Menschen, 754–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-39026-8_1019.

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Quéric, Nadia-Valérie. "Shewanella". En Encyclopedia of Geobiology, 791–92. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-9212-1_183.

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Larson, K. E. y M. C. Shaw. "Electrical and Morphological Characterization of Monocultures and Co-Cultures of Shewanella Putrefaciens and Shewanella Oneidensis in a Microbial Fuel Cell". En Ceramic Transactions Series, 25–36. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118585160.ch3.

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Kato, Chiaki, Takako Sato, Kaoru Nakasone y Hideyuki Tamegai. "Molecular Biology of the Model Piezophile, Shewanella violacea DSS12". En High-Pressure Microbiology, 305–17. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555815646.ch17.

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Saffarini, Daad, Ken Brockman, Alex Beliaev, Rachida Bouhenni y Sheetal Shirodkar. "Shewanella oneidensis and Extracellular Electron Transfer to Metal Oxides". En Bacteria-Metal Interactions, 21–40. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18570-5_2.

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Otero, Fernanda Jiménez, Matthew D. Yates y Leonard M. Tender. "Extracellular Electron Transport in Geobacter and Shewanella: A Comparative Description". En Microbial Electrochemical Technologies, 3–14. Boca Raton : CRC Press, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429487118-1.

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Yam, Hong Meng, Sean Kar Weng Leong, Xinzhi Qiu y Norazean Zaiden. "Bioremediation of Arsenic-Contaminated Water Through Application of Bioengineered Shewanella oneidensis". En IRC-SET 2020, 559–74. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9472-4_49.

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Bücking, Clemens, Marcus Schicklberger y Johannes Gescher. "The Biochemistry of Dissimilatory Ferric Iron and Manganese Reduction in Shewanella oneidensis". En Microbial Metal Respiration, 49–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-32867-1_3.

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Brenzinger, Susanne y Kai M. Thormann. "Dynamics in the Dual Fuel Flagellar Motor of Shewanella oneidensis MR-1". En Methods in Molecular Biology, 285–95. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6927-2_23.

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Ona-Nguema, G., M. Abdelmoula, F. Jorand, O. Benali, A. Géhin, J. C. Block y J. M. R. Génin. "Microbial Reduction of Lepidocrocite γ-FeOOH by Shewanella putrefaciens; The Formation of Green Rust". En Industrial Applications of the Mössbauer Effect, 231–37. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0299-8_24.

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Actas de conferencias sobre el tema "Shewanellae"

Nilufar, Sharmin y Mst Jannatul Ferdousi Ara. "Cluster analysis of microarray data of Shewanella oneidensis". En 2008 11th International Conference on Computer and Information Technology (ICCIT). IEEE, 2008. http://dx.doi.org/10.1109/iccitechn.2008.4803062.

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Liu, Jinxiang, Fen Xiong, Lishan Rong, Shiyou Li y Shuibo Xie. "A reduction mechanism of U( ) on Shewanella oneidensis by spectral analysis". En 2015 International Forum on Energy, Environment Science and Materials. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/ifeesm-15.2015.254.

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Wray, Addien y Drew Gorman-Lewis. "BIOENERGETICS OF AEROBIC GROWTH BY SHEWANELLA PUTREFACIENS STRAIN CN32". En GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-370641.

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Kwon, Jae-Sung, Sandeep Ravindranath, Aloke Kumar, Joseph Irudayaraj y Steven T. Wereley. "Application of an Optically Induced Electrokinetic Manipulation Technique on Live Bacteria". En ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39324.

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In this paper, we apply a recently demonstrated rapid electrokinetic patterning (REP) technique to Shewanella oneidensis MR-1 and confirm the application possibility of the technique on bio-materials. This technique utilizes a simple microfluidic chip with two indium tin oxide (ITO) coated parallel electrodes and requires the simultaneous application of AC electric field and the hologram provided from an infrared (1064 nm) laser, in order to control and aggregate particles onto electrodes. For the experimentation in this paper, Shewanella oneidensis MR-1 are cultured by green fluorescent protein (GFP) on Luria-Bertani (LB) agar plate and through sample pretreatment process, mid-log phase samples of the bacteria finally are obtained. As a result of applying REP technique to this bacteria sample, we could collect a lot of the bacteria onto ITO electrode surfaces rapidly and the bacteria cluster could be translated with the movement of laser focus position under uniform electric field. Also it was confirmed that there exists a particular frequency range, i.e. critical frequency for REP based bacteria cluster. We could find that under the application of REP technique, the ellipsoidal bacteria are reoriented with respect to electric field lines as electrical frequency increases up. Also the change in the vertical distance between the bacteria and the electrode surface with electrical voltages could be observed. These results show that the REP technique can be used to separate, sort and manipulate bioparticles like bacteria.

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Ilyas, F., J. Bahgat, S. Saidy, K. Kashinsky, M. Verderame y F. Hastrup. "A Putrifying Dive: Septic Shock and Resultant Death from Shewanella Putrifaciens Infection". En American Thoracic Society 2022 International Conference, May 13-18, 2022 - San Francisco, CA. American Thoracic Society, 2022. http://dx.doi.org/10.1164/ajrccm-conference.2022.205.1_meetingabstracts.a1618.

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Yang, Jie, Sasan Ghobadian, Reza Montazami y Nastaran Hashemi. "Using Shewanella Oneidensis MR1 as a Biocatalyst in a Microscale Microbial Fuel Cell". En ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 7th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fuelcell2013-18373.

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Microbial fuel cell (MFC) technology is a promising area in the field of renewable energy because of their capability to use the energy contained in wastewater, which has been previously an untapped source of power. Microscale MFCs are desirable for their small footprints, relatively high power density, fast start-up, and environmentally-friendly process. Microbial fuel cells employ microorganisms as the biocatalysts instead of metal catalysts, which are widely applied in conventional fuel cells. MFCs are capable of generating electricity as long as nutrition is provided. Miniature MFCs have faster power generation recovery than macroscale MFCs. Additionally, since power generation density is affected by the surface-to-volume ratio, miniature MFCs can facilitate higher power density. We have designed and fabricated a microscale microbial fuel cell with a volume of 4 μL in a polydimethylsiloxane (PDMS) chamber. The anode and cathode chambers were separated by a proton exchange membrane. Carbon cloth was used for both the anode and the cathode. Shewanella Oneidensis MR-1 was chosen to be the electrogenic bacteria and was inoculated into the anode chamber. We employed Ferricyanide as the catholyte and introduced it into the cathode chamber with a constant flow rate of approximately 50 μL/hr. We used trypticase soy broth as the bacterial nutrition and added it into the anode chamber approximately every 15 hours once current dropped to base current. Using our miniature MFC, we were able to generate a maximum current of 4.62 μA.

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Sackett, Joshua, Leah Trutschel y Annette Rowe. "Elucidating a Novel Mechanism of Extracellular Electron Uptake in Shewanella oneidensis MR-1". En Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2259.

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Zhou, Alyssa Y., Tom J. Zajdel, Michaela A. TerAvest y Michel M. Maharbiz. "A miniaturized monitoring system for electrochemical biosensing using Shewanella oneidensis in environmental applications". En 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2015. http://dx.doi.org/10.1109/embc.2015.7320131.

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Hajimorad, Meghdad y Jeffrey A. Gralnick. "Plasmid copy number variation of a modular vector set in Shewanella oneidensis MR-1". En 2020 42nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) in conjunction with the 43rd Annual Conference of the Canadian Medical and Biological Engineering Society. IEEE, 2020. http://dx.doi.org/10.1109/embc44109.2020.9176029.

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DRISCOLL, MICHAEL E., MARGIE F. ROMINE, FRANK S. JUHN, MARGRETHE H. SERRES, LEE ANNE MCCUE, ALEX S. BELIAEV, JAMES K. FREDRICKSON y TIMOTHY S. GARDNER. "IDENTIFICATION OF DIVERSE CARBON UTILIZATION PATHWAYS IN SHEWANELLA ONEIDENSIS MR-1 VIA EXPRESSION PROFILING". En Proceedings of the 7th Annual International Workshop on Bioinformatics and Systems Biology (IBSB 2007). IMPERIAL COLLEGE PRESS, 2007. http://dx.doi.org/10.1142/9781860949920_0028.

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Informes sobre el tema "Shewanellae"

Zhou, Jizhong y Zhili He. The Shewanella Federation: Functional Genomic Investigations of Dissimilatory Metal-Reducing Shewanella. Office of Scientific and Technical Information (OSTI), enero de 2009. http://dx.doi.org/10.2172/946694.

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Tiedje, James M., Kostas Konstantinidis y Mark Worden. Integrated genome-based studies of Shewanella Ecophysiology. Office of Scientific and Technical Information (OSTI), enero de 2014. http://dx.doi.org/10.2172/1113809.

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Zhou, Jizhong y Zhili He. Integrated Genome-Based Studies of Shewanella Ecophysiology. Office of Scientific and Technical Information (OSTI), abril de 2014. http://dx.doi.org/10.2172/1127087.

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Spormann, Alfred. Integrated Genome-Based Studies of Shewanella Ecophysiology. Office of Scientific and Technical Information (OSTI), julio de 2011. http://dx.doi.org/10.2172/1077855.

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NEALSON, KENNETH H. INTEGRATED GENOME-BASED STUDIES OF SHEWANELLA ECOPHYSIOLOGY. Office of Scientific and Technical Information (OSTI), octubre de 2013. http://dx.doi.org/10.2172/1096441.

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Serres, Margrethe H. Integrated Genome-Based Studies of Shewanella Echophysiology. Office of Scientific and Technical Information (OSTI), junio de 2012. http://dx.doi.org/10.2172/1044590.

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Andrei L Osterman, Ph D. Integrated Genome-Based Studies of Shewanella Ecophysiology. Office of Scientific and Technical Information (OSTI), diciembre de 2012. http://dx.doi.org/10.2172/1057485.

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Saffarini, Daad A. Integrated genome based studies of Shewanella ecophysiology. Office of Scientific and Technical Information (OSTI), marzo de 2013. http://dx.doi.org/10.2172/1068002.

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Segre Daniel y Beg Qasim. Integrated genome-based studies of Shewanella ecophysiology. Office of Scientific and Technical Information (OSTI), febrero de 2012. http://dx.doi.org/10.2172/1034753.

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Heidelberg, John F. Complete genome sequence of Shewanella putrefaciens. Final report. Office of Scientific and Technical Information (OSTI), abril de 2001. http://dx.doi.org/10.2172/811383.

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