1nb3

Crystal structure of stefin A in complex with cathepsin H: N-terminal residues of inhibitors can adapt to the active sites of endo-and exopeptidases

spinqualitylabelsall models 1nb3, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1nb3 is a 12 chain structure with sequence from Homo sapiens and Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Ligands: BMA, NAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CATH_PIG 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 PubMed Binding of cystatin-type inhibitors to papain-like exopeptidases cannot be explained by the stefin B-papain complex. The crystal structure of human stefin A bound to an aminopeptidase, porcine cathepsin H, has been determined in monoclinic and orthorhombic crystal forms at 2.8A and 2.4A resolutions, respectively. The asymmetric unit of each form contains four complexes. The structures are similar to the stefin B-papain complex, but with a few distinct differences. On binding, the N-terminal residues of stefin A adopt the form of a hook, which pushes away cathepsin H mini-chain residues and distorts the structure of the short four residue insertion (Lys155A-Asp155D) unique to cathepsin H. Comparison with the structure of isolated cathepsin H shows that the rims of the cathepsin H structure are slightly displaced (up to 1A) from their position in the free enzyme. Furthermore, comparison with the stefin B-papain complex showed that molecules of stefin A bind about 0.8A deeper into the active site cleft of cathepsin H than stefin B into papain. The approach of stefin A to cathepsin H induces structural changes along the interaction surface of both molecules, whereas no such changes were observed in the stefin B-papain complex. Carboxymethylation of papain seems to have prevented the formation of the genuine binding geometry between a papain-like enzyme and a cystatin-type inhibitor as we observe it in the structure presented here. Crystal structure of Stefin A in complex with cathepsin H: N-terminal residues of inhibitors can adapt to the active sites of endo- and exopeptidases.,Jenko S, Dolenc I, Guncar G, Dobersek A, Podobnik M, Turk D J Mol Biol. 2003 Feb 21;326(3):875-85. PMID:12581647 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cathepsin 3D structures

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