MMP103
Ontology highlight
ABSTRACT:
ORGANISM(S): Methanococcus maripaludis
PROVIDER: GSE8728 | GEO | 2007/08/30
SECONDARY ACCESSION(S): PRJNA101983
REPOSITORIES: GEO
Similar Datasets
Project description:Methanococcus maripaludis is a methanogenic Archaea that conserves energy from molecular hydrogen to reduce carbon dioxide to methane. Chemostat grown cultures limited for hydrogen, phosphate, or leucine were compared to determine the regulatory response to hydrogen limitation. This was done by comparing hydrogen limited cultures to both leucine limited and phosphate limited cultures. Slow and rapid growing samples limited for either hydrogen or phosphate were compared to determine the regulatory effects of growth rate. Keywords: archaea, hydrogen, leucine, phosphate, nutrient limitation, growth rate, methanogen
2007-04-01 | GSE6747 | GEO
Project description:Methanococcus maripaludis is a methanogenic archaeon. Within its genome, there are two operons for membrane associated hydrogenases, eha and ehb. To investigate the regulation of ehb on the cell, an S40 mutant was constructed in such a way that a portion of the ehb operon was replaced by pac cassette in the wild type parental strain S2 (done by Whitman's group at the University of Georgia). Four samples of each strain were grown in batch culture. Differences in transcriptional expression between S40 and S2 were measured using cDNA arrays, with flip dye experiments for each biological replicate. Keywords: mutant, archaea, carbon, hydrogenase, methanogen
2005-09-20 | GSE2745 | GEO
Project description:Methanococcus maripaludis response to hydrogen limitation
| PRJNA98989 | ENA
Project description:Genome reorganization by large scale indels, gene displacements, and horizontal gene transfers allow an organism to re-organize genes into operons (“operonization”) and explore novel strategies for adapting to its changing environment. We have characterized the process of operonization by mapping and comparing transcriptome structures (TSs) of four phylogenetically diverse exptremophilic archaea: a hydrogenotrophic methanogen (Methanococcus maripaludis S2), an anaerobic thermophile (Pyrococcus furiosis DSM 3638), an acidophilic and aerobic thermophile (Sulfolobus solfataricus P2), and a photoheterotrophic halophile (Halobacterium salinarum NRC-1). We demonstrate how the evolution of new transcriptional elements (promoters and terminators) is utilized as a mechanism to incorporate translocated, inverted, and newly acquired genes into existing gene regulatory programs. This SuperSeries is composed of the following subset Series: GSE26777: Methanococcus maripaludis S2 growth curve, tiling arrays GSE26778: Pyrococcus furiosus DSM 3638 growth curve, tiling arrays GSE26779: Sulfolobus solfataricus P2 growth curve, tiling arrays Refer to individual Series
2011-06-27 | E-GEOD-26782 | biostudies-arrayexpress
Project description:Effects of hydrogen on physiology and regulation of methanogenesis in Methanococcus maripaludis
2013-09-16 | GSE42124 | GEO
Project description:Hydrogenotrophic methanogenic Archaea are defined by a H2 requirement for growth. Despite this requirement, many hydrogenotrophs are also capable of growth with formate as an electron donor for methanogenesis. Hydrogenotrophs respond to H2 starvation both phenotypically and at the level of gene expression; however, the responses during growth on formate have not been characterized. Here we report that during continuous culture of Methanococcus maripaludis under defined nutrient conditions, growth yields relative to methane production decreased markedly with either H2 excess or formate excess, suggesting that energy spilling occurs. Using microarray analysis, we show that the expression of genes encoding F420-dependent steps of methanogenesis, including one of two formate dehydrogenases, increased with H2 starvation, but with formate occurred at high levels regardless of limitation or excess. One gene, encoding H2-dependent methylene-tetrahydromethanopterin dehydrogenase, decreased in expression with either H2 limitation or formate limitation. Expression of genes for the second formate dehydrogenase, molybdenum-dependent formylmethanofuran dehydrogenase, and molybdenum transport increased specifically with formate limitation. Of the two formate dehydrogenases, only the first could support growth on formate in batch culture where formate was in excess.
2013-05-03 | GSE42111 | GEO
Project description:The microbiologically influenced corrosion is one of the serious problems in petroleum tanks. It was found that the methanogenic archaea Methanococcus maripaludis OS7 isolated from the inside of petroleum tanks has the iron corrosive property. To identify the genes related to the iron corrosion, we have performed proteome analysis of iron-corrosive archaeon M. maripaludis OS7 and its corrosion-defective mutant.
2018-10-04 | PXD010311 | JPOST Repository
Project description:Genome reorganization by large scale indels, gene displacements, and horizontal gene transfers allow an organism to re-organize genes into operons (“operonization”) and explore novel strategies for adapting to its changing environment. We have characterized the process of operonization by mapping and comparing transcriptome structures (TSs) of four phylogenetically diverse exptremophilic archaea: a hydrogenotrophic methanogen (Methanococcus maripaludis S2), an anaerobic thermophile (Pyrococcus furiosis DSM 3638), an acidophilic and aerobic thermophile (Sulfolobus solfataricus P2), and a photoheterotrophic halophile (Halobacterium salinarum NRC-1). We demonstrate how the evolution of new transcriptional elements (promoters and terminators) is utilized as a mechanism to incorporate translocated, inverted, and newly acquired genes into existing gene regulatory programs. This SuperSeries is composed of the SubSeries listed below.
2011-06-27 | GSE26782 | GEO
Project description:Catabolic and anabolic processes are finely coordinated in microbes to provide optimized fitness under varying environmental conditions. Understanding this coordination and the resulting physiological traits identifies fundamental microbial strategies of acclimation. Here, we characterized the systems-level physiology of Methanococcus maripaludis, a niche-specialized methanogenic archaeon, at different growth rates under phosphate (i.e., anabolic) limitation. We observed a decoupling of catabolism and anabolism resulting in lower biomass yield relative to catabolically limited cells. In addition, the mass abundance of several coarse-grained proteome sectors exhibited a linear relationship with growth rate, most notably ribosomes and their biogenesis. Accordingly, cellular RNA content also correlated with growth rate. Although the methanogenesis proteome sector was invariant, the metabolic capacity for methanogenesis correlated with growth rate suggesting translationally independent regulation. These observations are in stark contrast to the physiology of M. maripaludis under formate (i.e., catabolic) limitation, where cells keep an invariant proteome including ribosomal content and a high methanogenesis capacity across a wide range of growth rates. Our findings reveal that although highly niche-specialized, M. maripaludis employs fundamentally different strategies to coordinate global physiology during anabolic phosphate and catabolic formate limitation.
2021-06-14 | MSV000087621 | MassIVE
Project description:Conversion of biomass-derived syngas (gaseous mixture of mainly H2, CO and CO2) to methane might be a sustainable alternative for the biofuel industry. Via the syngas route more methane can be produced from biomass than via conventional anaerobic digestion. Methanogenic archaea are key players in syngas conversion, but only a few are known to utilize CO (or syngas). Methanothermobacter thermoautotrophicus is one of the few hydrogenotrophic methanogens which has been observed to grow on CO. However, carboxydotrophic growth is slow and is reported to be readily inhibited above 50 kPa CO. The aim of this work was to get more insight of the CO metabolism in hydrogenotrophic archaea and to assess the potential toxic effects of CO towards these microorganisms. Archaeal genomic databases were searched for putative homologues of the Methanothermobacter thermoautotrophicus CODH alpha subunit (containing the catalytic site): the highest scores were for the CODH subunits of Methamothermobacter marburgensis (93% identity) and Methanococcus maripaludis (71%). M. thermoautotrophicus and the other two potential carboxydotrophic strains were incubated with CO and CO + H2 as sole substrates. In addition to M. thermoautotrophicus, M. marburgensis was able to grow methanogenically on CO alone and on CO + H2. In contrast to M. thermoautotrophicus, M. marburgensis was not as strongly inhibited when grown in presence of CO alone and was able to adapt its metabolism, shifting its lag phase from ~500 to ~100 hours. It was observed for both strains that presence of hydrogen stimulates the carbon monoxide metabolism. To gain further insight, the proteome of M. marburgensis culture grown on H2 + CO2 and H2 + CO2 + CO were analysed. Cultures grown with H2 + CO showed relative higher abundance of enzymes involved in CODH/ACS associated reactions and reactions involved in redox metabolism. Overall, the data suggests the strong reducing capacity of CO inhibits the hydrogenotrophic methanogen, making growth on CO as a sole substrate difficult for these organisms.
2016-08-03 | PXD003661 | Pride