Coenzyme B
From Infogalactic: the planetary knowledge core
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Names | |
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IUPAC name
2-[(7-mercapto-1-oxoheptyl)amino]-3-phosphonooxybutanoic acid
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Identifiers | |
104302-77-4 | |
ChemSpider | 343 |
Jmol 3D model | Interactive image Interactive image |
PubChem | 350 |
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Properties | |
C 11H 22NO 7PS |
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Molar mass | 343.333641 |
Vapor pressure | {{{value}}} |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references | |
Coenzyme B is a coenzyme required for redox reactions in methanogens. The full chemical name of coenzyme B is 7-mercaptoheptanoylthreoninephosphate.[1] The molecule contains a thiol, which is its principal site of reaction.
Coenzyme B reacts with 2-methylthioethanesulfonate (methyl-Coenzyme M, abbreviated CH
3–S–CoM), to release methane in methanogenesis:[2]
- CH
3–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:[3]
- CH
3–S–CoM + HS–CoB −O
2CCH=CHCO−
2 → −O
2CCH
2–CH
2CO−
2 + CoB–S–S–CoM
References
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