2zl4
From Proteopedia
Crystal structure of H.pylori ClpP S99A in complex with the peptide AAAA
Structural highlights
FunctionCLPP_HELPY Cleaves peptides in various proteins in a process that requires ATP hydrolysis. Has a chymotrypsin-like activity. Plays a major role in the degradation of misfolded proteins (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedClpP and its ATPase compartment, ClpX or ClpA, remove misfolded proteins in cells and are of utmost importance in protein quality control. The ring hexamers of ClpA or ClpX recognize, unfold, and translocate target substrates into the degradation chamber of the double-ring tetradecamer of ClpP. The overall reaction scheme catalyzed by ClpXP or ClpAP has been proposed; however, the molecular mechanisms associated with substrate recognition and degradation have not yet been clarified in detail. To investigate these mechanisms, we determined the crystal structures of ClpP from Helicobacter pylori in complex with product peptides bound to the active site as well as in the apo state. In the complex structure, the peptides are zipped with two antiparallel strands of ClpP and point to the adjacent active site, thus providing structural explanations for the broad substrate specificity, the product inhibition and the processive degradation of substrates in the chamber. The structures also suggest that substrate binding causes local conformational changes around the active site that ultimately induce the active conformation of ClpP. The structural basis for the activation and peptide recognition of bacterial ClpP.,Kim DY, Kim KK J Mol Biol. 2008 Jun 13;379(4):760-71. Epub 2008 Apr 20. PMID:18468623[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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