CPDadh: a new peptidase family homologous to the cysteine protease domain in bacterial MARTX toxins

Protein Sci. 2009 Apr;18(4):856-62. doi: 10.1002/pro.78.

Abstract

A cysteine protease domain (CPD) has been recently discovered in a group of multifunctional, autoprocessing RTX toxins (MARTX) and Clostridium difficile toxins A and B. These CPDs (referred to as CPDmartx) autocleave the toxins to release domains with toxic effects inside host cells. We report identification and computational analysis of CPDadh, a new cysteine peptidase family homologous to CPDmartx. CPDadh and CPDmartx share a Rossmann-like structural core and conserved catalytic residues. In bacteria, domains of the CPDadh family are present at the N-termini of a diverse group of putative cell-cell interaction proteins and at the C-termini of some RHS (recombination hot spot) proteins. In eukaryotes, catalytically inactive members of the CPDadh family are found in cell surface protein NELF (nasal embryonic LHRH factor) and some putative signaling proteins.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Bacterial Proteins / chemistry*
  • Bacterial Proteins / genetics*
  • Bacterial Proteins / metabolism
  • Bacterial Toxins / chemistry*
  • Bacterial Toxins / metabolism
  • Clostridium difficile / enzymology*
  • Cysteine Endopeptidases / chemistry*
  • Cysteine Endopeptidases / genetics*
  • Cysteine Endopeptidases / metabolism
  • Molecular Sequence Data
  • Protein Conformation
  • Protein Structure, Tertiary
  • Sequence Alignment
  • Structural Homology, Protein

Substances

  • Bacterial Proteins
  • Bacterial Toxins
  • Cysteine Endopeptidases