IUBMB Enzyme Nomenclature


Accepted name: 2-oxopropyl-CoM reductase (carboxylating)

Reaction: 2-mercaptoethanesulfonate + acetoacetate + NADP+ = 2-(2-oxopropylthio)ethanesulfonate + CO2 + NADPH

For diagram click here.

coenzyme M (CoM) = 2-sulfanylethane-1-sulfonate = 2-mercaptoethanesulfonate (deprecated)

Other name(s): NADPH:2-(2-ketopropylthio)ethanesulfonate oxidoreductase/carboxylase; NADPH:2-ketopropyl-coenzyme M oxidoreductase/carboxylase

Systematic name: 2-mercaptoethanesulfonate,acetoacetate:NADP+ oxidoreductase (decarboxylating)

Comments: Also acts on thioethers longer in chain length on the oxo side, e.g. 2-oxobutyl-CoM, but this portion must be attached to CoM (2-mercaptoethanesulfonate); no CoM analogs will substitute. This enzyme forms component II of a four-component enzyme system {comprising EC (2-hydroxypropyl-CoM lyase; component I), EC [2-oxopropyl-CoM reductase (carboxylating); component II], EC [2-(R)-hydroxypropyl-CoM dehydrogenase; component III] and EC [2-(S)-hydroxypropyl-CoM dehydrogenase; component IV]} that is involved in epoxyalkane carboxylation in Xanthobacter sp. strain Py2.

Links to other databases: BRENDA, EAWAG-BBD, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 244301-63-1


1. Allen, J.R., Clark, D.D., Krum, J.G. and Ensign, S.A. A role for coenzyme M (2-mercaptoethanesulfonic acid) in a bacterial pathway of aliphatic epoxide carboxylation. Proc. Natl. Acad. Sci. USA 96 (1999) 8432-8437. [PMID: 10411892]

2. Clark, D.D., Allen, J.R. and Ensign, S.A. Characterization of five catalytic activities associated with the NADPH:2-ketopropyl-coenzyme M [2-(2-ketopropylthio)ethanesulfonate] oxidoreductase/carboxylase of the Xanthobacter strain Py2 epoxide carboxylase system. Biochemistry 39 (2000) 1294-1304. [PMID: 10684609]

[EC created 2001]

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