22.214.171.124: coenzyme F420:CoB-CoM heterodisulfide,ferredoxin reductase
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Systematic Name on EC 126.96.36.199 - coenzyme F420:CoB-CoM heterodisulfide,ferredoxin reductase
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CoB,CoM,ferredoxin:coenzyme F420 oxidoreductase
The enzyme, characterized from the archaeon Methanosarcina acetivorans, catalyses the reduction of CoB-CoM heterodisulfide back to CoB and CoM. The enzyme consists of three components, HdrA, HdrB and HdrC, all of which contain [4Fe-4S] clusters. Electrons enter at HdrA, which also contains FAD, and are transferred via HdrC to the catalytic component, HdrB. During methanogenesis from acetate the enzyme catalyses the activity of EC 188.8.131.52, ferredoxin:CoB-CoM heterodisulfide reductase. However, it can also use electron bifurcation to direct electron pairs from reduced coenzyme F420 towards the reduction of both ferredoxin and CoB-CoM heterodisulfide. This activity is proposed to take place during Fe(III)-dependent anaerobic methane oxidation. cf. EC 184.108.40.206, H2:CoB-CoM heterodisulfide,ferredoxin reductase, EC 220.127.116.11, formate:CoB-CoM heterodisulfide,ferredoxin reductase, and EC 18.104.22.168, dihydromethanophenazine:CoB-CoM heterodisulfide reductase.