Academic literature on the topic 'Pseudoalteromonas tunicata'
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Journal articles on the topic "Pseudoalteromonas tunicata"
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Mai-Prochnow, Anne, Flavia Evans, Doralyn Dalisay-Saludes, Sacha Stelzer, Suhelen Egan, Sally James, Jeremy S. Webb, and Staffan Kjelleberg. "Biofilm Development and Cell Death in the Marine Bacterium Pseudoalteromonas tunicata." Applied and Environmental Microbiology 70, no. 6 (June 2004): 3232–38. http://dx.doi.org/10.1128/aem.70.6.3232-3238.2004.
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ABSTRACT The newly described green-pigmented bacterium Pseudoalteromonas tunicata (D2) produces target-specific inhibitory compounds against bacteria, algae, fungi, and invertebrate larvae and is frequently found in association with living surfaces in the marine environment. As part of our studies on the ecology of P. tunicata and its interaction with marine surfaces, we examined the ability of P. tunicata to form biofilms under continuous culture conditions within the laboratory. P. tunicata biofilms exhibited a characteristic architecture consisting of differentiated microcolonies surrounded by water channels. Remarkably, we observed a repeatable pattern of cell death during biofilm development of P. tunicata, similar to that recently reported for biofilms of Pseudomonas aeruginosa (J. S. Webb et al., J. Bacteriol. 185:4585-4595, 2003). Killing and lysis occurred inside microcolonies, apparently resulting in the formation of voids within these structures. A subpopulation of viable cells was always observed within the regions of killing in the biofilm. Moreover, extensive killing in mature biofilms appeared to result in detachment of the biofilm from the substratum. A novel 190-kDa autotoxic protein produced by P. tunicata, designated AlpP, was found to be involved in this biofilm killing and detachment. A ΔalpP mutant derivative of P. tunicata was generated, and this mutant did not show cell death during biofilm development. We propose that AlpP-mediated cell death plays an important role in the multicellular biofilm development of P. tunicata and subsequent dispersal of surviving cells within the marine environment.
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Rao, Dhana, Jeremy S. Webb, and Staffan Kjelleberg. "Competitive Interactions in Mixed-Species Biofilms Containing the Marine Bacterium Pseudoalteromonas tunicata." Applied and Environmental Microbiology 71, no. 4 (April 2005): 1729–36. http://dx.doi.org/10.1128/aem.71.4.1729-1736.2005.
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ABSTRACT Pseudoalteromonas tunicata is a biofilm-forming marine bacterium that is often found in association with the surface of eukaryotic organisms. It produces a range of extracellular inhibitory compounds, including an antibacterial protein (AlpP) thought to be beneficial for P. tunicata during competition for space and nutrients on surfaces. As part of our studies on the interactions between P. tunicata and the epiphytic bacterial community on the marine plant Ulva lactuca, we investigated the hypothesis that P. tunicata is a superior competitor compared with other bacteria isolated from the plant. A number of U. lactuca bacterial isolates were (i) identified by 16S rRNA gene sequencing, (ii) characterized for the production of or sensitivity to extracellular antibacterial proteins, and (iii) labeled with a fluorescent color tag (either the red fluorescent protein DsRed or green fluorescent protein). We then grew single- and mixed-species bacterial biofilms containing P. tunicata in glass flow cell reactors. In pure culture, all the marine isolates formed biofilms containing microcolony structures within 72 h. However, in mixed-species biofilms, P. tunicata removed the competing strain unless its competitor was relatively insensitive to AlpP (Pseudoalteromonas gracilis) or produced strong inhibitory activity against P. tunicata (Roseobacter gallaeciensis). Moreover, biofilm studies conducted with an AlpP− mutant of P. tunicata indicated that the mutant was less competitive when it was introduced into preestablished biofilms, suggesting that AlpP has a role during competitive biofilm formation. When single-species biofilms were allowed to form microcolonies before the introduction of a competitor, these microcolonies coexisted with P. tunicata for extended periods of time before they were removed. Two marine bacteria (R. gallaeciensis and P. tunicata) were superior competitors in this study. Our data suggest that this dominance can be attributed to the ability of these organisms to rapidly form microcolonies and their ability to produce extracellular antibacterial compounds.
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Franks, A., S. Egan, C. Holmstr�m, S. James, H. Lappin-Scott, and S. Kjelleberg. "Inhibition of Fungal Colonization by Pseudoalteromonas tunicata Provides a Competitive Advantage during Surface Colonization." Applied and Environmental Microbiology 72, no. 9 (September 2006): 6079–87. http://dx.doi.org/10.1128/aem.00559-06.
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ABSTRACT The marine epiphytic bacterium Pseudoalteromonas tunicata produces a range of extracellular secondary metabolites that inhibit an array of common fouling organisms, including fungi. In this study, we test the hypothesis that the ability to inhibit fungi provides P. tunicata with an advantage during colonization of a surface. Studies on a transposon-generated antifungal-deficient mutant of P. tunicata, FM3, indicated that a long-chain fatty acid-coenzyme A ligase is involved in the production of a broad-range antifungal compound by P. tunicata. Flow cell experiments demonstrated that production of an antifungal compound provided P. tunicata with a competitive advantage against a marine yeast isolate during surface colonization. This compound enabled P. tunicata to disrupt an already established fungal biofilm by decreasing the number of yeast cells attached to the surface by 66% � 9%. For in vivo experiments, the wild-type and FM3 strains of P. tunicata were used to inoculate the surface of the green alga Ulva australis. Double-gradient denaturing gradient gel electrophoresis analysis revealed that after 48 h, the wild-type P. tunicata had outcompeted the surface-associated fungal community, whereas the antifungal-deficient mutant had no effect on the fungal community. Our data suggest that P. tunicata is an effective competitor against fungal surface communities in the marine environment.
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Rao, Dhana, Jeremy S. Webb, Carola Holmström, Rebecca Case, Adrian Low, Peter Steinberg, and Staffan Kjelleberg. "Low Densities of Epiphytic Bacteria from the Marine Alga Ulva australis Inhibit Settlement of Fouling Organisms." Applied and Environmental Microbiology 73, no. 24 (October 26, 2007): 7844–52. http://dx.doi.org/10.1128/aem.01543-07.
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ABSTRACT Bacteria that produce inhibitory compounds on the surface of marine algae are thought to contribute to the defense of the host plant against colonization of fouling organisms. However, the number of bacterial cells necessary to defend against fouling on the plant surface is not known. Pseudoalteromonas tunicata and Phaeobacter sp. strain 2.10 (formerly Roseobacter gallaeciensis) are marine bacteria often found in association with the alga Ulva australis and produce a range of extracellular inhibitory compounds against common fouling organisms. P. tunicata and Phaeobacter sp. strain 2.10 biofilms with cell densities ranging from 102 to 108 cells cm−2 were established on polystyrene petri dishes. Attachment and settlement assays were performed with marine fungi (uncharacterized isolates from U. australis), marine bacteria (Pseudoalteromonas gracilis, Alteromonas sp., and Cellulophaga fucicola), invertebrate larvae (Bugula neritina), and algal spores (Polysiphonia sp.) and gametes (U. australis). Remarkably low cell densities (102 to 103 cells cm−2) of P. tunicata were effective in preventing settlement of algal spores and marine fungi in petri dishes. P. tunicata also prevented settlement of invertebrate larvae at densities of 104 to 105 cells cm−2. Similarly, low cell densities (103 to 104cells cm−2) of Phaeobacter sp. strain 2.10 had antilarval and antibacterial activity. Previously, it has been shown that abundance of P. tunicata on marine eukaryotic hosts is low (<1 × 103 cells cm−2) (T. L. Skovhus et al., Appl. Environ. Microbiol. 70:2373-2382, 2004). Despite such low numbers of P. tunicata on U. australis in situ, our data suggest that P. tunicata and Phaeobacter sp. strain 2.10 are present in sufficient quantities on the plant to inhibit fouling organisms. This strongly supports the hypothesis that P. tunicata and Phaeobacter sp. strain 2.10 can play a role in defense against fouling on U. australis at cell densities that commonly occur in situ.
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Dalisay, Doralyn S., Jeremy S. Webb, André Scheffel, Charles Svenson, Sally James, Carola Holmström, Suhelen Egan, and Staffan Kjelleberg. "A mannose-sensitive haemagglutinin (MSHA)-like pilus promotes attachment of Pseudoalteromonas tunicata cells to the surface of the green alga Ulva australis." Microbiology 152, no. 10 (October 1, 2006): 2875–83. http://dx.doi.org/10.1099/mic.0.29158-0.
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This study demonstrates that attachment of the marine bacterium Pseudoalteromonas tunicata to the cellulose-containing surface of the green alga Ulva australis is mediated by a mannose-sensitive haemagglutinin (MSHA-like) pilus. We have identified an MSHA pilus biogenesis gene locus in P. tunicata, termed mshI1I2JKLMNEGFBACDOPQ, which shows significant homology, with respect to its genetic characteristics and organization, to the MSHA pilus biogenesis gene locus of Vibrio cholerae. Electron microscopy studies revealed that P. tunicata wild-type cells express flexible pili peritrichously arranged on the cell surface. A P. tunicata mutant (SM5) with a transposon insertion in the mshJ region displayed a non-piliated phenotype. Using SM5, it has been demonstrated that the MSHA pilus promotes attachment of P. tunicata wild-type cells in polystyrene microtitre plates, as well as to microcrystalline cellulose and to the living surface of U. australis. P. tunicata also demonstrated increased pilus production in response to cellulose and its monomer constituent cellobiose. The MSHA pilus thus functions as a determinant of attachment in P. tunicata, and it is proposed that an understanding of surface sensing mechanisms displayed by P. tunicata will provide insight into specific ecological interactions that occur between this bacterium and higher marine organisms.
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Zhao, Chang-Hui, Jing-Jing Luo, Ting Gong, Xiang-Ling Huang, De-Zan Ye, and Zhu-Hua Luo. "Pseudoalteromonas xiamenensis sp. nov., a marine bacterium isolated from coastal surface seawater." International Journal of Systematic and Evolutionary Microbiology 64, Pt_2 (February 1, 2014): 444–48. http://dx.doi.org/10.1099/ijs.0.050229-0.
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A Gram-negative, oxidase- and catalase-positive, rod-shaped, non-spore-forming, motile, aerobic bacterium, designated Y2T, was isolated from surface seawater of Yundang Lake, Xiamen, China. The strain was able to grow in the presence of 0.5–6.0 % NaCl (optimum 1.0–1.5 %), at pH 5–10 (optimum pH 8) and at 10–40 °C (optimum 25 °C). Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain Y2T belongs to the genus Pseudoalteromonas , with the highest sequence similarity of 94.9 % to Pseudoalteromonas tunicata D2T; within the genus Pseudoalteromonas , it showed the lowest similarity of 92.8 % to Pseudoalteromonas denitrificans ATCC 43337T. The G+C content of the chromosomal DNA of strain Y2T was 45.1 mol%. The predominant fatty acids were summed feature 3 (C16 : 1ω6c and/or C16 : 1ω7c), C16 : 0, C12 : 0 3-OH and summed feature 8 (C18 : 1ω6c and/or C18 : 1ω7c). The only respiratory quinone detected was Q-8. Based on the phylogenetic and phenotypic characteristics, strain Y2T represents a novel species of the genus Pseudoalteromonas , for which the name Pseudoalteromonas xiamenensis sp. nov. is proposed; the type strain is Y2T ( = CGMCC 1.12157T = JCM 18779T).
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Egan, Suhelen, Sally James, Carola Holmstrom, and Staffan Kjelleberg. "Correlation between pigmentation and antifouling compounds produced by Pseudoalteromonas tunicata." Environmental Microbiology 4, no. 8 (August 2002): 433–42. http://dx.doi.org/10.1046/j.1462-2920.2002.00322.x.
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HOLMSTROM, C., S. JAMES, B. A. NEILAN, D. C. WHITE, and S. KJELLEBERG. "Pseudoalteromonas tunicata sp. nov., a bacterium that produces antifouling agents." International Journal of Systematic Bacteriology 48, no. 4 (October 1, 1998): 1205–12. http://dx.doi.org/10.1099/00207713-48-4-1205.
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Mai-Prochnow, Anne, Jeremy S. Webb, Belinda C. Ferrari, and Staffan Kjelleberg. "Ecological Advantages of Autolysis during the Development and Dispersal of Pseudoalteromonas tunicata Biofilms." Applied and Environmental Microbiology 72, no. 8 (August 2006): 5414–20. http://dx.doi.org/10.1128/aem.00546-06.
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ABSTRACT In the ubiquitous marine bacterium Pseudoalteromonas tunicata, subpopulations of cells are killed by the production of an autocidal protein, AlpP, during biofilm development. Our data demonstrate an involvement of this process in two parameters, dispersal and phenotypic diversification, which are of importance for the ecology of this organism and for its survival within the environment. Cell death in P. tunicata wild-type biofilms led to a major reproducible dispersal event after 192 h of biofilm development. The dispersal was not observed with a ΔAlpP mutant strain. Using flow cytometry and the fluorescent dye DiBAC4(3), we also show that P. tunicata wild-type cells that disperse from biofilms have enhanced metabolic activity compared to those cells that disperse from ΔAlpP mutant biofilms, possibly due to nutrients released from dead cells. Furthermore, we report that there was considerable phenotypic variation among cells dispersing from wild-type biofilms but not from the ΔAlpP mutant. Wild-type cells that dispersed from biofilms showed significantly increased variations in growth, motility, and biofilm formation, which may be important for successful colonization of new surfaces. These findings suggest for the first time that the autocidal events mediated by an antibacterial protein can confer ecological advantages to the species by generating a metabolically active and phenotypically diverse subpopulation of dispersal cells.
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Egan, Suhelen, Sally James, and Staffan Kjelleberg. "Identification and Characterization of a Putative Transcriptional Regulator Controlling the Expression of Fouling Inhibitors in Pseudoalteromonas tunicata." Applied and Environmental Microbiology 68, no. 1 (January 2002): 372–78. http://dx.doi.org/10.1128/aem.68.1.372-378.2002.
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ABSTRACT The dark green pigmented marine bacterium Pseudoalteromonas tunicata colonizes living surfaces and produces a range of extracellular compounds that inhibit common fouling organisms, including marine invertebrate larvae, algae, bacteria, and fungi. We have observed a positive correlation between the antifouling activity of P. tunicata strain D2 and the expression of pigmentation. To address the hypothesis that pigmentation and antifouling may be jointly regulated in this organism and to begin to identify potential regulatory elements, we used transposon mutagenesis to generate a strain of P. tunicata deficient in antifouling activity. The data presented here describe the phenotypic and molecular characterization of a nonpigmented transposon mutant strain of P. tunicata (D2W2). Analyses of the antifouling capabilities of D2W2 demonstrate that this strain is deficient in the ability to inhibit each of the target fouling organisms. Genetic analysis of D2W2 identified a gene, designated wmpR (white mutant phenotype), with high sequence similarity to transcriptional regulators ToxR from Vibrio cholerae and CadC from Escherichia coli. Two-dimensional polyacrylamide gel electrophoresis analysis revealed that WmpR is essential for the expression of a significant subset of stationary-phase-induced proteins likely to be important for the synthesis of fouling inhibitors. The identification of a gene involved in the regulation of expression of antifouling phenotypes will contribute to the understanding of the interactions between bacteria and other surface-colonizing organisms in the marine environment.
Dissertations / Theses on the topic "Pseudoalteromonas tunicata"
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Evans, Flavia F. Biotechnology & Biomolecular Sciences Faculty of Science UNSW. "Analysis of the secretome and type II secretion in pseudoalteromonas tunicata." Awarded by:University of New South Wales. Biotechnology & Biomolecular Sciences, 2007. http://handle.unsw.edu.au/1959.4/40449.
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The eukaryote-associated Pseudoalteromonas tunicata produces two pigments and several other bioactive compounds that are able to inhibit a range of marine organisms including bacteria, protozoa, fungi, algal spores and invertebrate larvae. Early studies suggested that the production of bioactive compounds is correlated with pigmentation in P. tunicata. In one of these studies, a transposon mutagenesis library identified a white mutant, wmpD-, which had been disrupted in a gene encoding a component of the type 11 secretion (T2S) machinery. The T2S system is involved in the transport of different extracellular enzymes in many bacteria. In some cases, the T2S pathway also exports proteins that remain attached to the cells. This thesis aimed to investigate the role of the T2S pathway in the production of the pigments and bioactive compounds in P. tunicata. In order to gain insight into this relationship, two proteomics approaches (2D-PAGE and iTRAQ) were applied to investigate the profile of the secreted proteins (or secretome) in P. tunicata wild-type and the white mutant wmpD-. Proteomic analysis using 2D-PAGE revealed that 23 proteins were differentially expressed between P. tunicata Wt and the mutant wmpD-. The identities of some of these proteins could be correlated with the function of the T2S system in P. tunicata. The role of one of the proteins identified using 2D-PAGE was further investigated through the construction of a gene knockout mutant (hiik mutant). The supernatant activity of the hiik mutant was compared to that of P. tunicata Wt, and it was found that the HiiA protease is required to block the activity of antimicrobial peptides, such as cecropins, produced by eukaryotic hosts in the environment. The second proteomics approach (iTRAQ) used in this thesis, enabled the relative quantitation of a number of proteins in the supernatant of P. tunicata Wt and the white mutant wmpD-. Some proteins with no function to date (hypothetical) were absent in the extracellular fraction of the wmpD- mutant, indicating they may be transported to the extracellular environment via the T2S pathway in P. tunicata. The comparative analysis of the secretome also revealed that TonS-related proteins, involved in iron acquisition, were up-regulated in the wmpD- mutant, possibly to compensate for the lack of TonS-dependant receptors in the outer membrane. Assays for iron binding activity showed that P. tunicata Wt seems to release iron binding compounds (or siderophores) constitutively into the supernatant, in contrast to the white mutant wmpD-, which responds to iron limitation by increasing the production of siderophores. Further outer membrane fractionation studies, indicated that the P. tunicata T2S system is likely to be involved in the transport of TonB-dependant receptors to the outer membrane. The overall results discussed in this thesis indicate that the T2S system has an essential role in the general physiology of P. tunicata, as for iron metabolism, as well as in the in the relationship between this bacterium and eukaryotic hosts in the environment.
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Egan, Suhelen Microbiology & Immunology UNSW. "Production and regulation of fouling inhibitory compounds by the marine bacterium Pseudoalteromonas tunicata." Awarded by:University of New South Wales. Microbiology and Immunology, 2001. http://handle.unsw.edu.au/1959.4/17838.
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The marine surface-associated bacterium Pseudoaltermonas tunicata, produces a range of compounds that inhibit fouling organisms, including invertebrate larvae, bacteria, algal spores and fungi. In addition to these antifouling compounds P. tunicata cells produce both a yellow and a purple pigment. The aim of this study was to further characterise the antifouling activities, their regulation and relationship with pigmentation, and the ecological significance of P. tunicata and related organisms. It was discovered that the anti-algal compound was extracellular, heat sensitive, polar and between 3 and 10 kDa in size. The anti-fungal compound was found to be the yellow pigment and active against a wide range of fungal and yeast isolates. Chemical analysis suggests that this compound consists of a carbon ring bound to a fatty-acid side chain. Genetic analysis supports the chemical data for the active compound as a mutant in a gene encoding for a long-chain fatty-acid CoA ligase was deficient for anti-fungal activity. To address the regulation of antifouling compounds and their relationship to pigmentation transposon mutagenesis of P. tunicata was performed. Mutants lacking the yellow pigment displayed a reduced ability to inhibit fouling organisms. Further analysis of these mutants identified genes involved with the synthesis and regulation of synthesis of pigment and antifouling compounds. One of these mutants was disrupted in a gene (wmpR) with similarity to the transcriptional regulators ToxR from Vibrio cholerae and CadC from Escherichia coli. Analysis of global protein expression using two-dimensional gel electrophoresis showed that WmpR is essential for the expression of at least fifteen proteins important for the synthesis of fouling inhibitors. The ecological significance of antifouling bacteria was addressed by assessing the antifouling capabilities of a collection of bacteria isolated from different marine surfaces. Overall, isolates from living surfaces displayed more antifouling traits then strains isolated from non-living surfaces. Five dark-pigmented strains originating from the alga Ulva lactuca were further studied. Phylogenetic and phenotypic analysis revealed that they were all members of the genus Pseudoalteromonas and were closely related to P. tunicata. Two strains represented a novel species within the genus and were taxonomically defined as P. ulvae sp. nov.
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Stelzer, Sacha Biotechnology & Biomolecular Sciences Faculty of Science UNSW. "WmpR regulation of antifouling compounds and iron uptake in the marine bacterium Pseudoalteromonas tunicata." Awarded by:University of New South Wales. School of Biotechnology and Biomolecular Sciences, 2006. http://handle.unsw.edu.au/1959.4/29354.
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The dark-green pigmented marine bacterium Pseudoalteromonas tunicata produces several extracellular compounds against a range of common fouling organisms including bacteria, fungi, protozoa, diatoms, invertebrate larvae and algal spores. The regulator WmpR, which has N-terminal similarity to ToxR from Vibrio cholerae and CadC from Escherichia coli, controls all of the pigment and antifouling phenotypes. These compounds appear at the onset of stationary phase. The role of WmpR as a stationary phase regulator in P. tunicata was investigated in this thesis. Starvation and stress studies demonstrated that WmpR does not appear to control genes necessary for survival during carbon, phosphate or nitrogen starvation and UV/hydrogen peroxide stress. Intriguingly, phosphate starvation caused pigmentation of wmpR mutant (D2W2) logarithmic phase cells, suggesting a second regulation of the pigments (and thus antifouling compounds) that could be mediated by the PhoR/B twocomponent regulatory system. Proteomic analysis using two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) found that 11 proteins were differentially regulated by WmpR, and the identities of some of these proteins suggested a role for WmpR as a general stationary phase regulator rather than a specific starvation or stress regulator. Gene expression studies using RNA-arbitrarily primed PCR introduced a new role for WmpR as a regulator of iron acquisition; a TonB-dependant outer membrane receptor gene and a non-ribosomal peptide synthetase (NRPS) gene were up-regulated in the stationary phase Wt strain compared to the D2W2 strain. An assay for iron-binding activity supported the proposal that the NRPS may be making a siderophore. Further studies demonstrated that WmpR is required for survival under long-term low-iron conditions and that the pigments and antifouling genes are down-regulated during low-iron, while biofilm formation is up-regulated. WmpR also appears to constitutively regulate the production of iron-binding compounds, a novel regulation of iron acquisition that has not been seen in other organisms studied so far. A model is proposed that describes WmpR as responding to environmental signals, including iron, and co-ordinating the expression of a complex regulon including a number of genes involved in iron acquisition, general stationary phase physiology and bioactive secondary metabolite production.
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Mai-Prochnow, Anne Gerda Erna Biotechnology & Bio-molecular Sciences UNSW. "Autolysis in the development and dispersal of biofilms formed by the marine bacterium Pseudoalteromonas tunicata." Awarded by:University of New South Wales. Biotechnology and Bio-molecular Sciences, 2006. http://handle.unsw.edu.au/1959.4/25537.
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The marine bacterium Pseudoalteromonas tunicata produces target-specific inhibitory compounds against bacteria, algae, fungi and invertebrate larvae and is frequently found in association with living surfaces in the marine environment. This study examined the ability of P. tunicata to form biofilms under continuous culture conditions within the laboratory. P. tunicata biofilms exhibited a characteristic architecture consisting of differentiated microcolonies surrounded by water-channels. Interestingly, a repeatable pattern of cell death in the centre of microcolonies was observed. The antibacterial and autolytic protein, AlpP, produced by P. tunicata was found to be involved in this biofilm killing and a
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Egan, Suhelen. "Production and regulation of fouling inhibitory compounds by the marine bacterium Pseudoalteromonas tunicata /." 2001. http://www.library.unsw.edu.au/~thesis/adt-NUN/public/adt-NUN20010925.141640/index.html.
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