Bibliographies thématiques / Hemiterpenes

Littérature scientifique sur le sujet « Hemiterpenes »

Auteur : Grafiati

Publié le 6 septembre 2023

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Articles de revues sur le sujet "Hemiterpenes"

Abrahanr, Wolf-Rainer, et Dawit Abate. « Chromanones from Lentinus crinitus (Basidiomycetes) ». Zeitschrift für Naturforschung C 50, n^o 11-12 (1 décembre 1995) : 748–50. http://dx.doi.org/10.1515/znc-1995-11-1202.

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The fungus Lentinus crinitus DR-5 (Basidiomycotina) produces in submerse culture the new natural products 2,2-dimethyl-6-methoxy-4-chromanone 1, its alcohol 3 and (S)-2,2-di-methyl-3-hydroxy-6-methoxy-4-chromanone 2. Beside these merohemiterpenes the antibioti-cally active hirsutane sesquiterpenes 5 -8 were isolated. The formation of these metabolites displayed strong dependence from the carbon source in the medium. While lactose favoured the formation of the antibiotic sesquiterpene ketones 5 and 6, they were suppressed with mannose where the hemiterpenes 1 and 4 and the hirsutane-diol 8 were the dominating metabolites.

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Yadav, Indrajeet, Akhil Rautela, Agendra Gangwar, Vigya Kesari, Aditya K. Padhi et Sanjay Kumar. « Geranyl Diphosphate Synthase (CrtE) Inhibition Using Alendronate Enhances Isoprene Production in Recombinant Synechococcus elongatus UTEX 2973 : A Step towards Isoprene Biorefinery ». Fermentation 9, n^o 3 (24 février 2023) : 217. http://dx.doi.org/10.3390/fermentation9030217.

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A hemiterpene, isoprene, is commercially produced from crude oil refining processes. As a result of fossil fuel depletion, isoprene production process development is gaining attention from recombinant cyanobacteria and other microbial systems for its industrial and biofuel applications. In the present study, a fast-growing and CO2-tolerant cyanobacteria, Synechococcus elongatus UTEX 2973, is engineered with Pueraria montana isoprene synthase (IspS) at neutral site I (NSI) in the genome of S. elongatus UTEX 2973. Furthermore, to enhance isoprene production a key enzyme (isopentenyl diphosphate isomerase, IDI) of the methyl-D-erythritol 4-phosphate (MEP) pathway is also overexpressed at neutral site III (NSIII). Wild-type and recombinant strains of S. elongatus UTEX 2973 (UTEX IspS and UTEX IspS.IDI) are studied for growth and isoprene production in the presence of an inducer (IPTG) and/or inhibitor (alendronate). Alendronate is used for the inhibition of geranyl diphosphate synthase (CrtE), downstream of the MEP pathway that catalyzes dimethylallyl diphosphate/isopentenyl pyrophosphate (DMAPP/IPP) condensation in the recombinant UTEX 2973 strains. The docking studies on SeCrtE (CrtE of Synechcoccus elongatus PCC 7942) and alendronate as an inhibitor have revealed that alendronate binds more tightly than IPP in the cavity of SeCrtE, with a higher number of intermolecular interactions and energy. The UTEX IspS strain has shown isoprene production below the limit of detection in the presence of an inducer and/or inhibitor; however, production studies using UTEX IspS.IDI showed a maximum production of 79.97 and 411.51 µg/g dry cell weight (DCW) in a single day in the presence of an inducer only and an inducer along with an inhibitor, respectively. The UTEX IspS.IDI strain produced 0.41 mg/g DCW of cumulative isoprene in the presence of an inducer and 1.92 mg/g DCW in the presence of an inducer as well as an inhibitor during six days of production. The yield improvement of isoprene is observed as being 4.7-fold by using the inhibition strategy, which is used for the first time in the recombinant cyanobacterial system. The average productivities of isoprene obtained from UTEX IspS.IDI are observed to be 2.8 μg/g DCW/h in the presence of an inducer and 13.35 μg/g DCW/h in the presence of an inducer as well as an inhibitor. This study provides a basis for the process development and yield improvement in isoprene production using a novel inhibition strategy in fast-growing recombinant cyanobacteria. Recombinant strains and metabolic pathway inhibition studies can be used in future attempts to photosynthetically produce hemiterpenes.

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Liu, Hong-Xin, Hai-Bo Tan, Kai Chen, Li-Yun Zhao, Yu-Chan Chen, Sai-Ni Li, Hao-Hua Li et Wei-Min Zhang. « Cytosporins A–D, novel benzophenone derivatives from the endophytic fungus Cytospora rhizophorae A761 ». Organic & ; Biomolecular Chemistry 17, n^o 9 (2019) : 2346–50. http://dx.doi.org/10.1039/c8ob03223h.

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Liu, Hongxin, Haibo Tan, Wenxuan Wang, Wenge Zhang, Yuchan Chen, Saini Li, Zhaoming Liu, Haohua Li et Weimin Zhang. « Cytorhizophins A and B, benzophenone-hemiterpene adducts from the endophytic fungus Cytospora rhizophorae ». Organic Chemistry Frontiers 6, n^o 5 (2019) : 591–96. http://dx.doi.org/10.1039/c8qo01306c.

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Baltenweck-Guyot, R., J. M. Trendel, P. Albrecht et A. Schaeffer. « New Hemiterpene Glycosides inVitis viniferaWine ». Journal of Natural Products 60, n^o 12 (décembre 1997) : 1326–27. http://dx.doi.org/10.1021/np970281x.

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Szabó, Géza, Harald Greger et Otmar Hofer. « Coumarin-hemiterpene ethers from Artemisia species ». Phytochemistry 24, n^o 3 (1985) : 537–41. http://dx.doi.org/10.1016/s0031-9422(00)80763-3.

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Nicoletti, Marcella, Lamberto Tomassini et Sebastiano Foddai. « A New Hemiterpene Glucoside fromOrnithogalum montanum ». Planta Medica 58, n^o 05 (octobre 1992) : 472. http://dx.doi.org/10.1055/s-2006-961519.

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FUCHINO, Hiroyuki, Hironori TACHIBANA et Nobutoshi TANAKA. « Three New Hemiterpene Glycosides from Ilex macropoda. » CHEMICAL & ; PHARMACEUTICAL BULLETIN 45, n^o 9 (1997) : 1533–35. http://dx.doi.org/10.1248/cpb.45.1533.

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Damtoft, Søren, et Søren Rosendal Jensen. « Hemialboside, a hemiterpene glucoside from Lamium album ». Phytochemistry 39, n^o 4 (juillet 1995) : 923–24. http://dx.doi.org/10.1016/0031-9422(95)00085-l.

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Choudhary, M. Iqbal, Nadra Naheed, Ahmed Abbaskhan, Sajjad Ali et Atta-ur-Rahman. « Hemiterpene glucosides and other constituents from Spiraea canescens ». Phytochemistry 70, n^o 11-12 (juillet 2009) : 1467–73. http://dx.doi.org/10.1016/j.phytochem.2009.07.013.

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Chapitres de livres sur le sujet "Hemiterpenes"

Shaaban, Hamdy A., et Amr Farouk. « Potential Antimicrobial Activities of Terpenoids ». Dans Terpenoids : Recent Advances in Extraction, Biochemistry and Biotechnology, 279–97. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9781681089645122010014.

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The antimicrobial effect of essential oils and their main constituents, the terpenoids, has been generally reviewed in this article, with a comparative investigation of the structure-activity relationship. Terpenoids are widespread metabolites in plants belonging to different chemical classes, whereas oxygenated derivatives constitute the predominates. They could be classified as diterpenes, triterpenes, tetraterpenes, or hemiterpenes and sesquiterpenes. As crude materials, terpenoids are also broadly utilized in drug, food, and beauty care product ventures. Terpenoids have antitumor, anti-inflammatory, antibacterial, antiviral, antimalarial effects, promote transdermal absorption, prevent and treat cardiovascular diseases, and hypoglycemic activities. Moreover, terpenoids have many critical uses as insecticides, immunoregulators, antioxidants, antiaging, and neuroprotection agents. Terpenoids have a complicated construction with assorted impacts and various components of activity. Using plants – containing – terpenoids as neutraceuticals in the nutrition of humans and animals also constitutes a potential issue as natural inhibitors for microbes. These phytochemicals are generally conveyed in soil products and are particularly helpful in food protection as microbial development inhibitors.

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Actes de conférences sur le sujet "Hemiterpenes"

Putri, Devi A., et Mardi Santoso. « Synthesis of hemiterpene 1-bromo-3-methyl-2-butene derivatives ». Dans 4TH INTERNATIONAL SEMINAR ON CHEMISTRY. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0052509.

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