Everything about Coenzyme B totally explained
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Coenzyme B is a
coenzyme required for
redox reactions in
methanogens. The full chemical name of coenzyme B is 7-thioheptanoylthreoninephosphate. The molecule contains a
thiol, which is its principal site of reaction.
Coenzyme B reacts with 2-methylthioethanesulfonate, abbreviated CH
3-S-CoM, to release
methane in
methanogenesis:
» CH3-S-CoM + HS-CoB → CH
4 + CoB-S-S-CoM
This conversion is catalyzed by the
enzyme methyl coenzyme M reductase, which contains cofactor
F430 as the
prosthetic group.
A related conversion that utilizes both HS-CoB and HS-CoM is the reduction of
fumarate to
succinate,
catalyzed by
fumarate reductase:
» CH
3-S-CoM + HS-CoB
-O
2CCH=CHCO
2- →
-O
2CCH
2-CH
2CO
2- + CoB-S-S-CoM
Further Information
Get more info on 'Coenzyme B'.
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