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

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

Author information

1
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9050, USA. jpei@chop.swmed.edu

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.

PMID:
19309740
PMCID:
PMC2762598
DOI:
10.1002/pro.78
[Indexed for MEDLINE]
Free PMC Article

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