4tpi

THE REFINED 2.2-ANGSTROMS (0.22-NM) X-RAY CRYSTAL STRUCTURE OF THE TERNARY COMPLEX FORMED BY BOVINE TRYPSINOGEN, VALINE-VALINE AND THE ARG15 ANALOGUE OF BOVINE PANCREATIC TRYPSIN INHIBITOR

spinqualitylabelsall models 4tpi, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4tpi is a 2 chain structure with sequence from Bos taurus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: CA, SO4, VAL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TRY1_BOVIN 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 Large orthorhombic crystals of the complex formed by bovine trypsinogen and a semisynthetic homologous bovine pancreatic trypsin inhibitor with the reactive-site lysine residue replaced by an arginine residue [( Arg15]PTI) have been obtained which are isomorphous with the crystals of PTI-trypsinogen [Bode, W., Schwager, P. and Huber, R. (1978) J. Mol. Biol. 118, 99-112]. The X-ray crystal structure of the ternary complex of trypsinogen-[Arg15]PTI with the dipeptide Val-Val has been determined by X-ray data to 2.2-A (0.22-nm) resolution by means of difference Fourier methods and has been crystallographically refined to a final R-value of 0.17. Replacement of the reactive-site Lys15 by an arginine residue is accompanied in the complex by small movements of polar side groups of trypsin and enclosed solvent molecules within the specificity pocket. Only solvent molecule 414 OH which mediates the hydrogen bond interactions between Lys15 NZ and Asp189 carboxylate is expelled, thus allowing the bulkier guanidyl group to approach this carboxylate. The dipeptide Val-Val binds in the pocket accepting the Ile-Val N-terminus in trypsin. The cavity left by the CD-methyl group of Ile16 upon replacement by a valine residue is only partially filled by slight rearrangements of neighbouring peptide side chains. Part of the positive free energy change observed upon replacement of Ile-Val may allow for the maintenance of this cavity. The refined 2.2-A (0.22-nm) X-ray crystal structure of the ternary complex formed by bovine trypsinogen, valine-valine and the Arg15 analogue of bovine pancreatic trypsin inhibitor.,Bode W, Walter J, Huber R, Wenzel HR, Tschesche H Eur J Biochem. 1984 Oct 1;144(1):185-90. PMID:6207021 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also BPTI 3D structures

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