Chlamydia protease-like activity factor (CPAF): characterization of proteolysis activity in vitro and development of a nanomolar affinity CPAF zymogen-derived inhibitor.

Journal Article (Journal Article)

During infection of epithelial cells, the obligate intracellular pathogen Chlamydia trachomatis secretes the serine protease Chlamydia protease-like activity factor (CPAF) into the host cytosol to regulate a range of host cellular processes through targeted proteolysis. Here we report the development of an in vitro assay for the enzyme and the discovery of a cell-permeable CPAF zymogen-based peptide inhibitor with nanomolar inhibitory affinity. Treating C. trachomatis-infected HeLa cells with this inhibitor prevented CPAF cleavage of the intermediate filament vimentin and led to the loss of vimentin cage surrounding the intracellular vacuole. Because Chlamydia is a genetically intractable organism, this inhibitor may serve as a tool for understanding the role of CPAF in pathogenesis.

Full Text

Duke Authors

Cited Authors

  • Bednar, MM; Jorgensen, I; Valdivia, RH; McCafferty, DG

Published Date

  • September 6, 2011

Published In

Volume / Issue

  • 50 / 35

Start / End Page

  • 7441 - 7443

PubMed ID

  • 21830778

Pubmed Central ID

  • PMC3608462

Electronic International Standard Serial Number (EISSN)

  • 1520-4995

Digital Object Identifier (DOI)

  • 10.1021/bi201098r


  • eng

Conference Location

  • United States