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( R )-Sulfolactate dehydrogenase (EC 1.1.1.337), termed ComC, is a member of an NADH/NADPH-dependent oxidoreductase family of enzymes that catalyze the interconversion of 2-hydroxyacids into their corresponding 2-oxoacids. The ComC reaction is reversible and in the biosynthetic direction causes the conversion of ( R )-sulfolactate to sulfopyruvate in the production of coenzyme M (2-mercaptoethanesulfonic acid). Coenzyme M is an essential cofactor required for the production of methane by the methyl-coenzyme M reductase complex. ComC catalyzes the third step in the first established biosynthetic pathway of coenzyme M and is also involved in methanopterin biosynthesis. In this study, ComC from  Methanobrevibacter millerae  SM9 was cloned and expressed in  Escherichia coli  and biochemically characterized. Sulfopyruvate was the preferred substrate using the reduction reaction, with 31% activity seen for oxaloacetate and 0.2% seen for  α -ketoglutarate. Optimal activity was observed at pH 6.5. The apparent  K  M  for coenzyme (NADH) was 55.1  μ M, and for sulfopyruvate, it was 196  μ M (for sulfopyruvate the  V  max  was 93.9  μ mol min −1  mg −1  and  k  cat  was 62.8 s −1 ). The critical role of ComC in two separate cofactor pathways makes this enzyme a potential means of developing methanogen-specific inhibitors for controlling ruminant methane emissions which are increasingly being recognized as contributing to climate change.

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Expression, Purification, and Characterization of (<i>R</i>)-Sulfolactate Dehydrogenase (ComC) from the Rumen Methanogen<i>Methanobrevibacter millerae</i>SM9

Expression, Purification, and Characterization of (R)-Sulfolactate Dehydrogenase (ComC) from the Rumen MethanogenMethanobrevibacter milleraeSM9