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Cell Mol Life Sci. 2005 Oct;62(19-20):2161-72.

The catalytic triad of serine peptidases.

Author information

  • Institute of Enzymology, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 7, 1518, Budapest 112, Hungary. polgar@enzim.hu

Abstract

The catalytic action of serine peptidases depends on the interplay of a nucleophile, a general base and an acid. In the classic trypsin and subtilisin families this catalytic triad is composed of serine, histidine and aspartic acid residues and exhibits similar spatial arrangements, but the order of the residues in the amino acid sequence is different. By now several new families have been discovered, in which the nucleophile-base-acid pattern is generally conserved, but the individual components can vary. The variations illustrate how different groups and different protein structures achieve the same reaction.

PMID:
16003488
[PubMed - indexed for MEDLINE]
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