4ar1 | pdb_00004ar1

Crystal Structure of the Peptidase Domain of Collagenase H from Clostridium histolyticum at 2.01 Angstrom resolution.

spinqualitylabelsall models 4ar1, resolution 2.01Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ar1 is a 1 chain structure with sequence from Clostridium histolyticum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, ZN Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Clostridial collagenases are among the most efficient enzymes to degrade by far the most predominant protein in the biosphere. Here we present crystal structures of the peptidases of three clostridial collagenase isoforms (ColG, ColH and ColT). The comparison of unliganded and liganded structures reveal a quaternary subdomain dynamics. In the unliganded ColH structure this globular dynamics is modulated by an aspartate switch motion that binds to the catalytic zinc. We further identified a calcium binding site in proximity to the catalytic zinc. Both ions are required for full activity, explaining why calcium critically affects the enzymatic activity of clostridial collagenases. Our studies further reveal that loops close to the active site thus serve as characteristic substrate selectivity filter. These elements explain the distinct peptidolytic and collagenolytic activities of these enzymes and provide a rational to engineer collagenases with customized substrate specificity as well as for inhibitor design. Structural basis for activity regulation and substrate preference of clostridial collagenases G, H, and T.,Eckhard U, Schonauer E, Brandstetter H J Biol Chem. 2013 May 23. PMID:23703618 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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