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ENZYME

ENZYME entry: EC 1.8.98.4

PURL: https://purl.expasy.org/enzyme/EC/1.8.98.4
Accepted Name
coenzyme F420:CoB-CoM heterodisulfide,ferredoxin reductase
Reaction catalysed
coenzyme B + 2 oxidized coenzyme F420-(gamma-L-Glu)(n) + coenzyme M + 2 reduced [2Fe-2S]-[ferredoxin] + 4 H(+) = coenzyme M-coenzyme B heterodisulfide + 2 reduced coenzyme F420-(gamma-L-Glu)(n) + 2 oxidized [2Fe-2S]-[ferredoxin]
Comment(s)
  • The enzyme, characterized from the archaeon Methanosarcina acetivorans, catalyzes 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 catalyzes the activity of EC 1.8.7.3.
  • However, it can also use electron bifurcation to direct electron pairs from reduced coenzyme F420 toward 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 1.8.98.5, EC 1.8.98.6, and EC 1.8.98.1.
Cross-references
BRENDA1.8.98.4
EC2PDB1.8.98.4
ExplorEnz1.8.98.4
KEGG Ligand Database for Enzyme Nomenclature1.8.98.4
IUBMB Enzyme Nomenclature1.8.98.4
MEDLINEFind literature relating to 1.8.98.4
MetaCyc1.8.98.4
Rhea expert-curated reactions1.8.98.4
UniProtKB/Swiss-Prot
Q8TM02, HDRA2_METACQ8TIB8, HDRB2_METACQ8TIB9, HDRC2_METAC

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