Electron Bifurcation and Confurcation in Methanogenesis and Reverse Methanogenesis
Abstract
Reduction of the disulfide of coenzyme M and coenzyme B (CoMS–SCoB) by heterodisulfide reductases (HdrED and HdrABC) is the final step in all methanogenic pathways. Flavin-based electron bifurcation (FBEB) by soluble HdrABC homologs play additional roles in driving essential endergonic reactions at the expense of the exergonic reduction of CoMS–SCoM. In the first step of the CO2 reduction pathway, HdrABC complexed with hydrogenase or formate dehydrogenase generates reduced ferredoxin (Fdx2-) for the endergonic reduction of CO2 coupled to the exergonic reduction of CoMS–SCoB dependent on FBEB of electrons from H2 or formate. Roles for HdrABC:hydrogenase complexes are also proposed for pathways wherein the methyl group of methanol is reduced to methane with electrons from H2. The HdrABC complexes catalyze FBEB-dependent oxidation of H2 for the endergonic reduction of Fdx driven by the exergonic reduction of CoMS–SCoB. The Fdx2- supplies electrons for reduction of the methyl group to methane. In H2- independent pathways, three-fourths of the methyl groups are oxidized producing Fdx2- and reduced coenzyme F420 (F420H2). The F420H2 donates electrons for reduction of the remaining methyl groups to methane requiring transfer of electrons from Fdx2- to F420. HdrA1B1C1 is proposed to catalyze FBEB-dependent oxidation of Fdx2- for the endergonic reductionmore »
- Authors:
-
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Biochemistry and Molecular Biology
- Publication Date:
- Research Org.:
- Pennsylvania State University, State College, PA 16801 (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1510457
- Grant/Contract Number:
- FG02-95ER20198
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Frontiers in Microbiology
- Additional Journal Information:
- Journal Volume: 9; Journal ID: ISSN 1664-302X
- Publisher:
- Frontiers Research Foundation
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; archaea; heterodisulfide reductase; methane; ferredoxin; hydrogen; acetate; formate
Citation Formats
Yan, Zhen, and Ferry, James G. Electron Bifurcation and Confurcation in Methanogenesis and Reverse Methanogenesis. United States: N. p., 2018.
Web. doi:10.3389/fmicb.2018.01322.
Yan, Zhen, & Ferry, James G. Electron Bifurcation and Confurcation in Methanogenesis and Reverse Methanogenesis. United States. https://doi.org/10.3389/fmicb.2018.01322
Yan, Zhen, and Ferry, James G. Wed .
"Electron Bifurcation and Confurcation in Methanogenesis and Reverse Methanogenesis". United States. https://doi.org/10.3389/fmicb.2018.01322. https://www.osti.gov/servlets/purl/1510457.
@article{osti_1510457,
title = {Electron Bifurcation and Confurcation in Methanogenesis and Reverse Methanogenesis},
author = {Yan, Zhen and Ferry, James G.},
abstractNote = {Reduction of the disulfide of coenzyme M and coenzyme B (CoMS–SCoB) by heterodisulfide reductases (HdrED and HdrABC) is the final step in all methanogenic pathways. Flavin-based electron bifurcation (FBEB) by soluble HdrABC homologs play additional roles in driving essential endergonic reactions at the expense of the exergonic reduction of CoMS–SCoM. In the first step of the CO2 reduction pathway, HdrABC complexed with hydrogenase or formate dehydrogenase generates reduced ferredoxin (Fdx2-) for the endergonic reduction of CO2 coupled to the exergonic reduction of CoMS–SCoB dependent on FBEB of electrons from H2 or formate. Roles for HdrABC:hydrogenase complexes are also proposed for pathways wherein the methyl group of methanol is reduced to methane with electrons from H2. The HdrABC complexes catalyze FBEB-dependent oxidation of H2 for the endergonic reduction of Fdx driven by the exergonic reduction of CoMS–SCoB. The Fdx2- supplies electrons for reduction of the methyl group to methane. In H2- independent pathways, three-fourths of the methyl groups are oxidized producing Fdx2- and reduced coenzyme F420 (F420H2). The F420H2 donates electrons for reduction of the remaining methyl groups to methane requiring transfer of electrons from Fdx2- to F420. HdrA1B1C1 is proposed to catalyze FBEB-dependent oxidation of Fdx2- for the endergonic reduction of F420 driven by the exergonic reduction of CoMS–SCoB. In H2- independent acetotrophic pathways, the methyl group of acetate is reduced to methane with electrons derived from oxidation of the carbonyl group mediated by Fdx. Electron transport involves a membrane-bound complex (Rnf) that oxidizes Fdx2- and generates a Na+ gradient driving ATP synthesis. It is postulated that F420 is reduced by Rnf requiring HdrA2B2C2 catalyzing FBEB-dependent oxidation of F420H2 for the endergonic reduction of Fdx driven by the exergonic reduction of CoMS–SCoB. The Fdx2- is recycled by Rnf and HdrA2B2C2 thereby conserving energy. The HdrA2B2C2 is also proposed to play a role in Fe(III)-dependent reverse methanogenesis. A flavin-based electron confurcating (FBEC) HdrABC complex is proposed for nitrate-dependent reverse methanogenesis in which the oxidation of CoM-SH/CoB-SH and Fdx2- is coupled to reduction of F420. The F420H2 donates electrons to a membrane complex that generates a proton gradient driving ATP synthesis.},
doi = {10.3389/fmicb.2018.01322},
journal = {Frontiers in Microbiology},
number = ,
volume = 9,
place = {United States},
year = {Wed Jun 20 00:00:00 EDT 2018},
month = {Wed Jun 20 00:00:00 EDT 2018}
}
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FIGURE 1: | The global carbon cycle. Solid lines indicate aerobic (red) and anaerobic (blue) steps in the cycle and dotted lines indicate transfer of material between aerobic and anaerobic environments. (1) Photosynthesis, (2) aerobic decomposition, (3) fermentation, (4) syntrophic acetogenesis, (5) CO2 reduction to methane with electrons derived frommore »
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Genomic analysis of methanogenic archaea reveals a shift towards energy conservation
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Metabolic, Phylogenetic, and Ecological Diversity of the Methanogenic Archaea
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A Metagenomics-Based Metabolic Model of Nitrate-Dependent Anaerobic Oxidation of Methane by Methanoperedens-Like Archaea
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Acetate Metabolism in Anaerobes from the Domain Archaea
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- Nazem-Bokaee, Hadi; Maranas, Costas D.
- Frontiers in Microbiology, Vol. 9
Electron and Proton Flux for Carbon Dioxide Reduction in Methanosarcina barkeri During Direct Interspecies Electron Transfer
journal, December 2018
- Holmes, Dawn E.; Rotaru, Amelia-Elena; Ueki, Toshiyuki
- Frontiers in Microbiology, Vol. 9
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.