PROSITE documentation PDOC00980
Coenzyme A transferases signatures


Coenzyme A (CoA) transferases are enzymes catalyzing the reversible transfer of CoA from one carboxylic acid to another. They have been identified in many prokaryotes and in mammalian tissues. They belong to an evolutionary conserved [1,2] family of proteins that consist of:

  • Succinyl CoA:3-oxoacid CoA transferase (EC (SCOT), which is responsible for the formation of acetoacetyl CoA by transfer of a CoA moiety from succinyl-CoA to a 3-oxoacid, usually acetoacetate. In higher eukaryotes it is a mitochondrial enzyme which plays a crucial role in ketone body metabolism. It has also been found in bacteria.
  • Bacterial 3-oxoadipate CoA-transferase (EC which carries out the penultimate step in the conversion of benzoate and 4-hydroxybenzoate to tricarboxylic acid cycle intermediates in bacteria utilizing the β- ketoadipate pathway.
  • Bacterial acetate CoA-transferase (EC
  • Clostridial butyrate-acetoacetate CoA-transferase (EC, which acts mainly to detoxify the medium by removing the acetate and butyrate excreted earlier in the fermentation.

The bacterial enzymes are heterodimer of two subunits (A and B) of about 25 Kd each while eukaryotic SCOT consist of a single chain which is colinear with the two bacterial subunits.

We developed two signature patterns for these enzymes. The first corresponds to a region in the N-terminal of the A subunit that may be implicated in the binding of CoA to the enzyme. The second corresponds to a region in the N-terminal of the B subunit and contains a glutamate that is involved in the catalytic mechanism [3].

Last update:

November 1997 / First entry.


Technical section

PROSITE methods (with tools and information) covered by this documentation:

COA_TRANSF_1, PS01273; Coenzyme A transferases signature 1  (PATTERN)

COA_TRANSF_2, PS01274; Coenzyme A transferases signature 2  (PATTERN)


1AuthorsParales R.E. Harwood C.S.
TitleCharacterization of the genes encoding beta-ketoadipate: succinyl-coenzyme A transferase in Pseudomonas putida.
SourceJ. Bacteriol. 174:4657-4666(1992).
PubMed ID1624453

2AuthorsCorthesy-Theulaz I.E. Bergonzelli G.E. Henry H. Bachmann D. Schorderet D.F. Blum A.L. Ornston L.N.
SourceJ. Biol. Chem. 272:25659-25667(1997).

3AuthorsRochet J.C. Bridger W.A.
TitleIdentification of glutamate 344 as the catalytic residue in the active site of pig heart CoA transferase.
SourceProtein Sci. 3:975-981(1994).
PubMed ID7915164

PROSITE is copyrighted by the SIB Swiss Institute of Bioinformatics and distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND 4.0) License, see prosite_license.html.


View entry in original PROSITE document format
View entry in raw text format (no links)