3pa8 | pdb_00003pa8

Structure of the C. difficile TcdB cysteine protease domain in complex with a peptide inhibitor

Loading... Status: waiting for Mol* initialization Structural highlights 3pa8 is a 2 chain structure with sequence from Clostridioides difficile 630. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: 621, CA, IHP, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q189K3_CLOD6 Publication Abstract from PubMed Clostridium difficile is a leading cause of nosocomial infections. The major virulence factors of this pathogen are the multi-domain toxins TcdA and TcdB. These toxins contain a cysteine protease domain (CPD) that autoproteolytically releases a cytotoxic effector domain upon binding intracellular inositol hexakisphosphate. Currently, there are no known inhibitors of this protease. Here, we describe the rational design of covalent small molecule inhibitors of TcdB CPD. We identified compounds that inactivate TcdB holotoxin function in cells and solved the structure of inhibitor-bound protease to 2.0 A. This structure reveals the molecular basis of CPD substrate recognition and informed the synthesis of activity-based probes for this enzyme. The inhibitors presented will guide the development of therapeutics targeting C. difficile, and the probes will serve as tools for studying the unique activation mechanism of bacterial toxin CPDs. Rational design of inhibitors and activity-based probes targeting Clostridium difficile virulence factor TcdB.,Puri AW, Lupardus PJ, Deu E, Albrow VE, Garcia KC, Bogyo M, Shen A Chem Biol. 2010 Nov 24;17(11):1201-11. PMID:21095570 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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