KEGG Orthology (KO) [BR:ko00001] 09100 Metabolism 09102 Energy metabolism 00680 Methane metabolism [PATH:ko00680] K00399 mcrA; methyl-coenzyme M reductase alpha subunit [EC:2.8.4.1] Enzymes [BR:ko01000] 2. Transferases 2.8 Transferring sulfur-containing groups 2.8.4 Transferring alkylthio groups 2.8.4.1 coenzyme-B sulfoethylthiotransferase K00399 mcrA; methyl-coenzyme M reductase alpha subunit [EC:2.8.4.1]