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Methane Oxidation - OSTI GOV

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Last Updated: 03 May 2022

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Biochemistry of aerobic biological methane oxidation

Methane conversion and reduction of methane emissions are both a potential route to methane reuse and mitigation of methane emissions. aerobic methanotrophs use methane monooxygenases to produce methane, converting it to methanol in the first step of their metabolic pathway. MMOs come in two forms: a particulate, membrane-bound enzyme, and a soluble, cytoplasmic enzyme. By contrast, sMMO uses a diiron active site, the catalytic cycle of which is well understood.

Source link: https://www.osti.gov/biblio/1852178


Large freshwater phages with the potential to augment aerobic methane oxidation

We reconstructed large phage genomes from freshwater lakes that were found to have bacteria that oxidize methane. phage-associated PmoC sequences resemble, and collaborate phylogenetically with, those of coexisting bacterial methanotrophs, including Methyloparacoccus, Methylocystis, and Methylobacter spp. PmoC-associated with additional PmoC genes embedded in bacterial genomes, allowing for rise in methane growth. Future research is required to determine whether phage-associated PmoC has similar functionality to other versions of PmoC encoded in bacterial genomes. Some phage-associated pmoC genes were highly expressed in situ, and, of note, three pmoC-phages were particularly infected with methanotroph. Thus, an increase in bacterial methane oxidation by pmoC-phages during infection could reduce the efflux of this potent greenhouse gas into the environment.

Source link: https://www.osti.gov/biblio/1816092


Microbial interactions in the anaerobic oxidation of methane: model simulations constrained by process rates and activity patterns: Process modelling of anaerobic methane oxidation

The release of electron transfer by electron transfer between methane-oxidizing archaea and sulfate-reducing bacteria, electron exchange among methane-oxidizing archaea and sulfate-reducing bacteria, disproportionation, and direct interspecies electron transfer are among the proposed syntrophic interactions. FISH-nanoSIMS' experimental results showed that simulation experiments were conducted in various combinations of archaeal and bacterial cells and aggregate sizes, as well as empirical results for AOM rates and intra-aggregate spatial patterns of cell-specific anabolic activity determined by FISH-nanoSIMS' experimental results.

Source link: https://www.osti.gov/biblio/1612579


Subgroup Characteristics of Marine Methane-Oxidizing ANME-2 Archaea and Their Syntrophic Partners as Revealed by Integrated Multimodal Analytical Microscopy

In multicelled convenes within methane seep environments, phylogenetically diverse environmental ANME archaea and sulfate-reducing bacteria collaborately catalyze the anaerobic oxidation of methane in multicellular condensation. Representatives of the ANME-2b clade, but not other ANME-2 groups, contained polyphosphate-like granules, while some bacteria associated with ANME-2a/2c had two distinct phases of iron mineral chains resembling magnetosomes. Cell volumes of ANME and their symbiotic allies, which were larger than previous estimates based on light microscopy revealed cell volumes of ANME and their symbiotic partners that were larger than previous estimates based on light microscopy. The cell volume was increasing in proportion to the number of granules inside, but the percentage of the cell occupied by these granules did not change with granule numbers.

Source link: https://www.osti.gov/biblio/1529227


Methanobactin and the Link between Copper and Bacterial Methane Oxidation

mbs are characterized by two heterocyclic rings containing thioamide groups that make up the copper coordination site's structurally. The mb molecule is derived from a peptide precursor that undergoes a series of posttranslational transformations, including ring formation, cleavage of a leader peptide sequence, and in some cases, the addition of a sulfate group. Mbs have a strong affinity for copper ions, which is consistent with their position in copper acquisition. Following binding, mbs rapidly reduce Cu 2+ to Cu 1+. Mbs will bind most transition metals and near-transition metals, as well as other hazardous metal-borne bacteria. We also investigate the potential uses, how mbs can influence multiple metals' bioavailability, and the numerous functions mbs can play in methanotrophic biology.

Source link: https://www.osti.gov/biblio/1470738


Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

In such a way, higher MO rates are usually found at the oxic/anoxic interface, where both molecules are present, most relying on lake CH4 and oxygen levels are mainly dependent on lake CH 4 and oxygen levels. With a new field laser spectroscopy device, we measured CH4 oxidation rates in 30 Alaskan lakes along a north-south latitudinal transect in winter and summer. In the winter, aerobic CH 4 oxidation was mainly governed by the dissolved O2 concentration, according to dissolved O 2. In non-yedoma permafrost lakes, thermokarst lakes which were established in yedoma-type permafrost were significantly higher CH4 oxidation rates compared to other thermokarst and non-thermokarst lakes that were in non-yedoma permafrost lakes.

Source link: https://www.osti.gov/biblio/1441151

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions