Methane formation and oxidation by prokaryotes

Niche Differentiation of Host-Associated Pelagic Microbes and Their Potential Contribution to Biogeochemical Cycling in Artificially Warmed Lakes

“…It is generally assumed that the bacterioplankton is the main driver for nutrient-cycling (e.g., C-cycling, N-cycling), however, recently zooplankton associated microbes have been shown to be more active in carbon cycling than their free-living counterparts (Eckert and Pernthaler, 2014) indicating modulation of pelagic biogeochemical activity by zooplankton associated bacteria. Methanotrophs and methylotrophs are groups of specialized microbes capable of using methane and methanol, respectively, (C1 cycling) as a sole carbon and energy source (Knief, 2015;Kallistova et al, 2017;Samad and Bertilsson, 2017). In this study, we observed that methanotrophic genera (e.g., Methylobacter, Methylocystis) predominantly occurred in the PA fraction.…”

Nickel(II)‐Mediated Reversible Thiolate/Disulfide Conversion as a Mimic for a Key Step of the Catalytic Cycle of Methyl‐Coenzyme M Reductase

“…TheX -ray structures of substrate or product bound MCR ox1-silent states of the enzyme [25] show N 4 SO and N 4 O 2 coordination to Ni II ,i nk eeping with N 4 -coordinated Ni II s affinity for Odonor ligands.Elemental analysis,ESI mass and other spectroscopic properties,similar to 1 Cl ( Figure S9-S11 [12-14,15a-b] No effect of chloride ion on the catalytic activity of MCR has been reported. [1][2][3][4][5][6][7][8] Complex 2 was synthesized either by refluxing aCH 3 OH solution of am ixture of L Figure S21B). Theelectronic spectrum of 2 in CH 3 CN ( Figure S12B) displays bands at l max /nm (e/ m À1 cm À1 ) = 866 (176), 468 sh (7050), 316 (43 860), 270 sh (42 845) and 232 sh (67 620), comparable to those of bisthiolato-S bridged hexa-coordinated Ni II complexes.…”

De genomas a comunidades: descrevendo alterações na comunidade bacteriana envolvida na oxidação do metano em solos da Amazônia

“…Embora o solo seja um filtro relativamente pequeno para o CH4, a ausência da oxidação deste composto pode resultar em um aumento na concentração atmosférica de aproximadamente 1,5 vezes. Assim, podemos concluir que o fluxo líquido de CH4 a partir de um determinado ambiente é um equilíbrio entre os dois processos opostos: a produção biológica (metanogenêse) e a oxidação (metanotrofia) (CHOWDHURY;DICK, 2013;KALLISTOVA et al, 2017).…”

“…(MEYER et al, 2017;NAVARRETE et al, 2015b;RODRIGUES et al, 2013). (DANILOVA et al, 2016;KALLISTOVA et al, 2017).…”

“…A assimilação do formaldeído encontrado em dois genomas montados pertencentes ao tipo II é comum, os metanotróficos da família Methylocystaceae (pertencentes ao tipo II) assimilam formaldeído através da via serina (KALLISTOVA et al, 2017). Metanotróficas e metilotróficos são aparentemente ambíguas, porém algumas metanotróficas não são metilo, elas liberam o metanol ou formaldeído para o meio modificando as condições do ambiente, o que pode estar ocorrendo com estes genomas montados (KELLY;WOOD, 2010;KOLB et al, 2003).…”