Coupling of methyl coenzyme M reduction with carbon dioxide activation in extracts of Methanobacterium thermoautotrophicum
- 1 November 1982
- journal article
- research article
- Published by American Society for Microbiology in Journal of Bacteriology
- Vol. 152 (2), 840-847
- https://doi.org/10.1128/jb.152.2.840-847.1982
Abstract
The stimulation of CO2 reduction to methane by addition of 2-(methylthio)ethanesulfonate (CH3-S-CoM) to cell extracts of M. thermoautotrophicum was investigated. Similar stimulation of CO2 reduction by CH3-S-CoM was found for cell extracts of M. bryantii and Methanospirillum hungatei. The CH3-S-CoM requirement could be met by the methanogenic precursors formaldehyde, serine or pyruvate, or by 2-(ethylthio)ethanesulfonate (CH3CH2-S-CoM), but not by other coenzyme M derivatives. Efficient reduction of CO2 to CH4 was favored by low concentrations of CH3-S-CoM and high concentrations of CO2. SH compounds were identified as effective inhibitors of CO2 reduction. Both an allosteric model and a free radical model for the mechanism of CO2 activation and reduction are discussed.This publication has 11 references indexed in Scilit:
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