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tfrB

Gene
tfrB
Protein
Fumarate reductase (CoM/CoB) subunit B
Organism
Methanothermobacter marburgensis (strain ATCC BAA-927 / DSM 2133 / JCM 14651 / NBRC 100331 / OCM 82 / Marburg)
Length
489 amino acids
Function
Catalyzes the reduction of fumarate with reduced coenzyme M (CoM-S-H) and coenzyme B (CoB-S-H). In vitro, is able to reduces fumarate with reduced benzyl viologen, oxidize CoM-S-H and CoB-S-H to CoM-S-S-CoB with methylene blue, and reduce CoM-S-S-CoB with reduced benzyl viologen. The enzyme has specificity for the two thiol compounds as the CoB--CoM heterodisulfide reductase. The enzyme is very sensitive to oxygen.
Mass
54.086 kDa
Sequence
MINVKVLRFEPGVDEKPHLESYDIPSKEKMKVLDALQLINKMYNANIAFRSSCRAGQCGSCAVKMNGEVVLACRAEVEDGAVIEPVDLPVIKDLMVDRSEIEDKVRAMGLYLQSEARGIQRIKPEDYQDTKKLRGCIECFSCISSCPVIKESTEYAGPYFMRYISKFAFDPRDEAERAAGGVEEGLYCCTTCGKCAEVCPKELNVPGDAIEKLRAMACREGAGPLDAHRKIKKLISETGRSVDHIGKGFIESVGQNPGSRIGFFTGCLVDYRMPDVGMALLRVLREHGFEVDVPDGQVCCGSPMIRTGQLDIVEDLVERNRRALEGYDTIITVCAGCGATLKKDYPRYGVELNVLDISEFLADRIDDIKMKPVNMRVTYHDPCHLLRGQGVKLEPRKILNSIPGLEFVEMEKQGQCCGSGGGVKSGKPEIAESLGKKKAEMIRKLNVDAVITICPFCQLHIKDSLEKEGLGDVKVMNILELLDMAYSDD