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- *************************************************
- * Chloramphenicol acetyltransferase active site *
- *************************************************
-
- Chloramphenicol acetyltransferase (CAT) (EC 2.3.1.28) [1] catalyzes the
- acetyl-CoA dependent acetylation of chloramphenicol (Cm), an antibiotic which
- inhibits prokaryotic peptidyltransferase activity. Acetylation of Cm by CAT
- inactivates the antibiotic. A histidine residue, located in the C-terminal
- section of the enzyme, plays a central role in its catalytic mechanism. We
- derived a signature pattern from the region surrounding this active site
- residue.
-
- -Consensus pattern: Q-[LIV]-H-H-[SA]-x(2)-D-G-[FY]-H
- [The second H is the active site residue]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Note: there is a second family of CAT [2], evolutionary unrelated to the main
- family described above. These CAT belong to the cysE/lacA/nodL family of
- acetyltransferases (see the relevant section).
-
- -Last update: December 1992 / Text revised.
-
- [ 1] Shaw W.V., Leslie A.G.W.
- Annu. Rev. Biophys. Biophys. Chem. 20:363-386(1991).
- [ 2] Parent R., Roy P.H.
- J. Bacteriol. 174:2891-2897(1992).
-