3fp7 | pdb_00003fp7

Anionic trypsin variant S195A in complex with bovine pancreatic trypsin inhibitor (BPTI) cleaved at the scissile bond (LYS15-ALA16) determined to the 1.46 A resolution limit

spinqualitylabelsall models 3fp7, resolution 1.46Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3fp7 is a 3 chain structure with sequence from Bos taurus and Rattus norvegicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.46Å Ligands: CA, EDO, PG4, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TRY2_RAT 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 The serine proteases are among the most thoroughly studied enzymes, and numerous crystal structures representing the enzyme-substrate complex and intermediates in the hydrolysis reactions have been reported. Some aspects of the catalytic mechanism remain controversial, however, especially the role of conformational changes in the reaction. We describe here a high-resolution (1.46 A) crystal structure of a complex formed between a cleaved form of bovine pancreatic trypsin inhibitor (BPTI) and a catalytically inactive trypsin variant with the BPTI cleavage site ideally positioned in the active site for resynthesis of the peptide bond. This structure defines the positions of the newly generated amino and carboxyl groups following the 2 steps in the hydrolytic reaction. Comparison of this structure with those representing other intermediates in the reaction demonstrates that the residues of the catalytic triad are positioned to promote each step of both the forward and reverse reaction with remarkably little motion and with conservation of hydrogen-bonding interactions. The results also provide insights into the mechanism by which inhibitors like BPTI normally resist hydrolysis when bound to their target proteases. Structure of a serine protease poised to resynthesize a peptide bond.,Zakharova E, Horvath MP, Goldenberg DP Proc Natl Acad Sci U S A. 2009 Jul 7;106(27):11034-9. Epub 2009 Jun 19. PMID:19549826 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also BPTI 3D structures Trypsin 3D structures

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