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symbionts, a promising source of bioactive natural products

Science China Chemistry 2015年第7期58卷 1097-1109页

作者： Xuan Zhang Wei Wei Renxiang Tan State Key Laboratory of Pharmaceutical Biotechnology College of Life Science Nanjing University

symbionts are microorganisms residing in multicellular hosts(e.g., plants and animals), and they have been witnessed to be a rich source of diverse functional molecules. This review describes structures and biological activities of symbiont-derived secondary metabolites commonly referred to as "natural products", and highlights that symbiotic microbes represent an underexplored reservoir of natural products with unique scaffolds and promising significance in managing human healthcare and agricultural production.

关键词： symbionts natural products bioactivities

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Construction of a Metagenomic DNA Library of Sponge symbionts and Screening of Antibacterial Metabolites

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Journal of Ocean University of China 2006年第2期5卷 119-122页

作者： CHEN Juan ZHU Tianjiao LI Dehai CUI Chengbin FANG Yuchun LIU Hongbing LIU Peipei GU Qianqun ZHU Weiming Key Laboratory of Marine Drugs of Chinese Ministry of Education Institute of Marine Drug and FoodOcean University of China Qingdao 266003 P. R. China Beijing Institute of Pharmacology and Toxicology AMMS Beijing 100850 P.R. China

To study the bioactive metabolites produced by sponge-derived uncultured symbionts, a metagenomic DNA library of the symbionts of sponge Gelliodes gracilis was constructed. The average size of DNA inserts in the library was 20 kb. This library was screened for antibiotic activity using paper disc assaying. Two clones displayed the antibacterial activity against Micrococcus tetragenus. The metabolites of these two clones were analyzed through HPLC. The result showed that their metabolites were quite different from those of the host E. coli DNA and the host containing vector pHZ132. This study may present a new approach to exploring bioactive metabolites of sponge symbionts.

关键词： metagenomic DNA library sponge symbionts metabolite bioactivity

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Antifouling Activity of Bacterial symbionts of Seagrasses against Marine Biofilm-Forming Bacteria

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Journal of Environmental Protection 2011年第9期2卷 1245-1249页

作者： Dietriech G. Bengen Miftahuddin Majid Khoeri Bintang Marhaeni Ocky Karna Radjasa Agus Sabdono Herawati Sudoyo Graduate School of Marine Sciences Bogor Agricultural University Department of Fisheries and Marine Science Soedirman University Marine Microbiology Unit Eijkman Institute for Molecular Biology Department of Marine Science Diponegoro University

Marine biofouling has been regarded as a serious problem in the marine environment. The application of TBT and other heavy metal-based antifoulants has created another environmental problem. The present study explored the possible role of baterial symbionts of seagrasses Thalassia hemprichii, and Enhalus acoroides, which were successfully screened for antifouling activity against marine biofilm-forming bacteria isolated from the surrounding colonies of seagrasses. Bacterial symbionts were isolated and tested against biofilm-forming bacteria resulted in 4 bacterial symbionts capable of inhibiting the growth biofilm-forming isolates. Molecular identification based on 16S rRNA gene sequences revealed that the active bacterial symbionts belonged to the members of the genera Bacillus and Virgibacillus. Further tests of the crude extracts of the active bacterial symbionts supported the potential of these symbionts as the alternative source of environmentally friendly marine antifoulants.

关键词： Biofouling Antifoulant Bacterial symbionts Seagrasses

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Wolbachia symbiosis and insect immune response

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Insect Science 2008年第1期15卷 89-100页

作者： Stefanos Siozios Panagiotis Sapountzis Panagiotis Ioannidis Kostas Bourtzis Department of Environmental and Natural Resources Management University of Ioannina Agrinio 30100 Greece

Bacterial intraceUular symbiosis is very common in insects, having significant consequences in promoting the evolution of life and biodiversity. The bacterial group that has recently attracted particular attention is Wolbachia pipientis which probably represents the most ubiquitous endosymbiont on the planet. W. pipientis is a Gram-negative obligatory intracellular and maternally transmitted a-proteobacterium, that is able to establish symbiotic associations with arthropods and nematodes. In arthropods, Wolbachia pipientis infections have been described in Arachnida, in Isopoda and mainly in Insecta. They have been reported in almost all major insect orders including Diptera, Coleoptera, Hemiptera, Hymenoptera, Orthoptera and Lepidoptera. To enhance its transmission, W. pipientis can manipulate host reproduction by inducing parthenogenesis, feminization, male killing and cytoplasmic incompatibility. Several polymerase chain reaction surveys have indicated that up to 70% of all insect species may be infected with W. pipientis. How does W. pipientis manage to get established in diverse insect host species？ How is this intracellular bacterial symbiont species so successful in escaping the host immune response？ The present review presents recent advances and ongoing scientific efforts in the field. The current body of knowledge in the field is summarized, revelations from the available genomic information are presented and as yet unanswered questions are discussed in an attempt to present a comprehensive picture of the unique ability of W. pipientis to establish symbiosis and to manipulate reproduction while evading the host＇s immune system.

关键词： Drosophila immune response insects symbionts Wolbachia

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Predicted Functional Shifts Due to Type of Soil Microbiome and Watering of Two Wild Plants in Western Region of Saudi Arabia

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Phyton-International Journal of Experimental Botany 2022年第10期91卷 2249-2268页

作者： Lina Baz Aala A.Abulfaraj Manal A.Tashkandi Hanadi M.Baeissa Mohammed Y.Refai Aminah A.Barqawi Ashwag Shami Haneen W.Abuauf Ruba A.Ashy Rewaa S.Jalal Department of Biochemistry Faculty of ScienceKing AbdulAziz UniversityJeddah21589Saudi Arabia Biological Sciences Department College of Science&ArtsKing Abdulaziz UniversityRabigh21911Saudi Arabia Department of Biochemistry College of ScienceUniversity of JeddahJeddahSaudi Arabia Department of Chemistry Al-Leith University College Umm Al Qura UniversityMakkahSaudi Arabia Department of Biology College of SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Department of Biology Faculty of Applied ScienceUmm Al-Qura UniversityMakkahSaudi Arabia Department of Biology College of ScienceUniversity of JeddahJeddahSaudi Arabia

The present study aimed to predict differential enrichment of pathways and compounds in the rhizosphere microbiomes of the two wild plants(Abutilon fruticosum and Nitrosalsola vermiculata)and to predict functional shifts in microbiomes due to *** sequencing of 16S rRNA region V3–V4 was done and gene-based microbial compositions were enrolled in PICRUSt to predict enriched pathways and *** results indicated that“ABC transporters”and“Quorum sensing”pathways are among the highest enriched pathways in rhizosphere microbiomes of the two wild plants compared with those of the bulk soil *** highest enriched compounds in soil microbiomes of the two wild plants included five proteins and three enzymes participating in one or more KEGG *** of these eight compounds showed higher predicted enrichment in rhizosphere soil microbiomes,while only one,namely phosphate transport system substrate-binding protein,showed higher enrichment in the surrounding bulk soil *** terms of differentially enriched compounds due to watering,only the dual-specific aspartyl-tRNA(Asn)/glutamyl-tRNA(Gln)amidotransferase subunit A showed higher enrichment in rhizosphere soil of the two wild plants after 24 h of *** of the highly enriched compounds namely branched-chain amino acid transport system ATP-binding protein and branched-chain amino acid transport system substrate-binding protein,are encoded by genes stimulated by the plant’s GABA that participates in conferring biotic and abiotic stresses in plants and improves the plant’s growth *** 3-Oxoacyl-[ACP]reductase,a member of the short-chain alcohol dehydrogenase/reductase(SDR)superfamily,participates in fatty acids elongation cycles and contributes to plant-microbe symbiotic relationships,while enoyl-CoA hydratase has a reverse action as it participates in“Fatty acid degradation”*** methyl-accepting chemotaxis protein is an environmental signal that sense“Bacteri

关键词： Amplicon sequencing PICRUSt KEGG GABA symbionts wild plants

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