Cellular and Molecular Life Sciences CMLS

, Volume 62, Issue 19, pp 2161-2172

First online:

The catalytic triad of serine peptidases

  • L. PolgárAffiliated withInstitute of Enzymology, Biological Research Center, Hungarian Academy of Sciences Email author 

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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.

Key words.

Mechanisms of peptidase action β-lactamase cytomegalovirus Ntp-hydrolyses oxyanion binding site