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Dissertation
Analysis of secondary metabolite biosynthetic gene clusters in lichen metagenomes
Authors: --- --- --- --- --- et al.
Year: 2022 Publisher: Liège Université de Liège (ULiège)

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Abstract

Lichens are organisms resul-ng from the symbio-c associa-on between a fungus and a photosynthe-c partner, a green alga or a cyanobacterium. The unique chemical diversity that results from this way of life reveals numerous compounds with various therapeu-c interests.
To exploit this poten-al, I use a recent method of genome reconstruc-on for six species of Pel-gera lichens and highlight the capabili-es of automated bioinforma-cs tools in the context of this metagenomic study. ASer obtaining the genome assemblies, the gene-c mo-fs involved in the biosynthesis of secondary metabolites of cyanobionts were inves-gated with automated bioinforma-cs tools.
In a first step, this study demonstrated the validity of the metagenomic assembly protocol to reconstruct the genome of cyanobionts of the genus Nostoc from Pel-gera species collected in the wild. In a second step, the inves-ga-on of the Nostoc genomes revealed a remarkably high biosynthe-c poten-al and promise for the discovery of new natural products. The gene clusters mainly detected were associated with the NRPS (non-ribosomal pep-de synthetases) and PKS (polyke-de synthases) enzyme synthesis pathways. On the other hand, the majority of the gene-c biosynthe-c pathways detected in this study had no biological descrip-on to date. These observa-ons highlighted the interest in automated methods in the search for new metabolomic profiles. Finally, the iden-fica-on of par-cularly rich secondary metabolite synthesis poten-als revealed by cyanobionts from P.appalacchensis, P.asia-ca, P.borenquensis, and P.mikado species, suggested a gene-c heritage.


Book
Biofertilizer germplasm collections at IRRI.
Authors: --- --- ---
ISBN: 9712200256 Year: 1992 Publisher: Manila : International Rice Research Institute,

Genomes and genomics of nitrogen-fixing organisms
Authors: ---
ISBN: 1280283254 9786610283255 1402030541 1402030533 1402025106 9048167787 Year: 2005 Volume: 3 Publisher: Dordrecht, The Netherlands : Springer,

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Abstract

Genomes and Genomics of Nitrogen-fixing Organisms This is Volume 3 of a seven-volume series on all aspects of Nitrogen Fixation. The series aims to be the definitive authority in the field and to act as a benchmark for some years to come. Rather than attempting to cram the whole field into a single volume, the subject matter is divided among seven volumes to allow authors the luxury of writing in depth with a comprehensive reference base. All authors are recognized practicing scientists in the area of their contribution, which ensures the high quality, relevance, and readability of the chapters. In establishing the rationale for, and the organization of, this book, we realized the need to divide it into two sections. The first section should be organism based and should review our current knowledge of the genomes of nitrogen-fixing organisms and what these nucleotide sequences tell us. The second section should then be technology based. It should review what technologies are available to mine the data inherent in the nucleotide sequences and how they are now being used to produce gene-function data from differential gene expression.


Book
Bioactive Molecules from Marine Microorganisms
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

For this Special Issue book, ten papers focusing on novel bioactive molecules from different marine microorganisms, including fungi, cyanobacteria, actinobacteria and diatoms, were selected. The isolated biomolecules represent different structures and showed anticancer, antiviral, antifungal, antibacterial, anti-inflammatory and enzyme-inhibiting activities. One of the papers is a review article on microviridins, a class of bioactive cyanobacterial peptides.

Keywords

Medicine --- marine-derived fungus --- Aspergillus terreus --- thiodiketopiperazines --- dihydroisocoumarins --- Epicoccum nigrum --- deep-sea-derived fungus --- diketopiperazine enantiomers --- cytotocxic activity --- diatoms --- marine biotechnology --- anti-inflammatory --- drug discovery --- Cylindrotheca closterium --- mangrove Streptomyces --- genetic dereplication --- anti-microbial --- antiproliferative --- endophyte fungus --- Aspergillus versicolor --- diketopiperazines --- ECD calculation --- enantiomers --- bianthraquinones --- meroterpenoids --- anti-inflammatory activity --- Stemphylium sp. --- cyanobacteria --- nostocyclopeptides --- Nostoc --- ncp gene cluster --- nonribosomal peptide synthetase --- aeruginosamides --- Limnoraphis --- cytotoxicity --- oligopeptide --- microviridin --- biotechnology --- ecology --- Penicillium citrinum --- chromone derivatives --- anti-cancer activity --- marine-derived fungus --- Aspergillus terreus --- thiodiketopiperazines --- dihydroisocoumarins --- Epicoccum nigrum --- deep-sea-derived fungus --- diketopiperazine enantiomers --- cytotocxic activity --- diatoms --- marine biotechnology --- anti-inflammatory --- drug discovery --- Cylindrotheca closterium --- mangrove Streptomyces --- genetic dereplication --- anti-microbial --- antiproliferative --- endophyte fungus --- Aspergillus versicolor --- diketopiperazines --- ECD calculation --- enantiomers --- bianthraquinones --- meroterpenoids --- anti-inflammatory activity --- Stemphylium sp. --- cyanobacteria --- nostocyclopeptides --- Nostoc --- ncp gene cluster --- nonribosomal peptide synthetase --- aeruginosamides --- Limnoraphis --- cytotoxicity --- oligopeptide --- microviridin --- biotechnology --- ecology --- Penicillium citrinum --- chromone derivatives --- anti-cancer activity


Book
Bioactive Molecules from Marine Microorganisms
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

For this Special Issue book, ten papers focusing on novel bioactive molecules from different marine microorganisms, including fungi, cyanobacteria, actinobacteria and diatoms, were selected. The isolated biomolecules represent different structures and showed anticancer, antiviral, antifungal, antibacterial, anti-inflammatory and enzyme-inhibiting activities. One of the papers is a review article on microviridins, a class of bioactive cyanobacterial peptides.


Book
Freshwater Algal Toxins : Monitoring and Toxicity Profile
Authors: ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Cyanobacterial abundance has increased disproportionately, and this trend is likely to continue in the coming decades. This increase not only has deleterious effects on ecosystem biodiversity but also adversely affects drinking water supplies, livestock watering, crop yields, aquaculture, etc. Thus, the proliferation of cyanobacterial blooms presents human and animal health risks due to the common production of potent toxins, cyanotoxins. Moreover, these risks are aggravated by the accumulation potential of cyanotoxins and their transference to the food chain. In spite of the worldwide increasing occurrence of cyanotoxins, they are still underestimated in regulations. However, risk management of cyanotoxins is only possible after a thorough risk evaluation, and for that purpose, toxicity and exposure data are required. Thus, occurrence and monitoring information is of key importance, and new data in relation to the conditions that favor cyanobacterial growth and cyanotoxin production are welcome in order to prevent their appearance. On the other hand, in regard to toxicity, there are still many data gaps to fill. This book compiles 10 research papers and a review, which provide valuable contributions on all these aspects and demonstrate the importance of cyanobacteria toxins research.

Keywords

Research & information: general --- Environmental economics --- inflammatory bowel disease --- dextran sulfate sodium --- colitis --- microcystin --- colon --- HAB --- Adda --- canine intoxication --- MMPB --- urinalysis --- hair --- ELISA --- LC-MS/MS --- Microcystin-LR --- Non-alcoholic Fatty Liver Disease --- No Observed Adverse Effect Level --- Leprdb/J mice --- hepatotoxicity --- oxidative stress --- TiO2 enriched phosphopeptides --- Cyanotoxins --- microcystin congeners --- MC-LA --- nutrients --- climate --- Great Lakes --- raw water intake --- multivariate statistics --- long-term monitoring --- cyanobacteria --- microcystin-LR --- cylindrospermopsin --- cyanotoxins mixture --- plant growth --- toxin bioaccumulation --- cyanotoxin --- structure --- PP2A inhibition --- liquid chromatography --- mass spectrometry --- cyanotoxins --- metal --- zinc --- Microcystis aeruginosa --- in vivo --- genotoxicity --- micronucleus --- comet assay --- enzyme-modified comet assay --- rats --- drinking water quality --- Mozambique --- public health --- Llayta --- Nostoc --- flow cytometry --- liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) --- risk assessment --- management strategies --- modelling --- inflammatory bowel disease --- dextran sulfate sodium --- colitis --- microcystin --- colon --- HAB --- Adda --- canine intoxication --- MMPB --- urinalysis --- hair --- ELISA --- LC-MS/MS --- Microcystin-LR --- Non-alcoholic Fatty Liver Disease --- No Observed Adverse Effect Level --- Leprdb/J mice --- hepatotoxicity --- oxidative stress --- TiO2 enriched phosphopeptides --- Cyanotoxins --- microcystin congeners --- MC-LA --- nutrients --- climate --- Great Lakes --- raw water intake --- multivariate statistics --- long-term monitoring --- cyanobacteria --- microcystin-LR --- cylindrospermopsin --- cyanotoxins mixture --- plant growth --- toxin bioaccumulation --- cyanotoxin --- structure --- PP2A inhibition --- liquid chromatography --- mass spectrometry --- cyanotoxins --- metal --- zinc --- Microcystis aeruginosa --- in vivo --- genotoxicity --- micronucleus --- comet assay --- enzyme-modified comet assay --- rats --- drinking water quality --- Mozambique --- public health --- Llayta --- Nostoc --- flow cytometry --- liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) --- risk assessment --- management strategies --- modelling


Book
Freshwater Algal Toxins : Monitoring and Toxicity Profile
Authors: ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Cyanobacterial abundance has increased disproportionately, and this trend is likely to continue in the coming decades. This increase not only has deleterious effects on ecosystem biodiversity but also adversely affects drinking water supplies, livestock watering, crop yields, aquaculture, etc. Thus, the proliferation of cyanobacterial blooms presents human and animal health risks due to the common production of potent toxins, cyanotoxins. Moreover, these risks are aggravated by the accumulation potential of cyanotoxins and their transference to the food chain. In spite of the worldwide increasing occurrence of cyanotoxins, they are still underestimated in regulations. However, risk management of cyanotoxins is only possible after a thorough risk evaluation, and for that purpose, toxicity and exposure data are required. Thus, occurrence and monitoring information is of key importance, and new data in relation to the conditions that favor cyanobacterial growth and cyanotoxin production are welcome in order to prevent their appearance. On the other hand, in regard to toxicity, there are still many data gaps to fill. This book compiles 10 research papers and a review, which provide valuable contributions on all these aspects and demonstrate the importance of cyanobacteria toxins research.

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