3otj

A Crystal Structure of Trypsin Complexed with BPTI (Bovine Pancreatic Trypsin Inhibitor) by X-ray/Neutron Joint Refinement

spinqualitylabelsall models 3otj, resolution 2.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3otj is a 2 chain structure with sequence from Bovin. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, DOD, SO4 Activity: Trypsin, with EC number 3.4.21.4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [BPT1_BOVIN] Inhibits trypsin, kallikrein, chymotrypsin, and plasmin. Publication Abstract from PubMed In this work, the crystal structure of the beta-trypsin-bovine pancreatic trypsin inhibitor (BPTI) complex was refined and the D and H atoms in the complex were identified using data from both 1.6 A resolution X-ray diffraction and 2.15 A resolution neutron diffraction. After crystallization in an H(2)O solution, the sample crystal was soaked in a D(2)O solution for about two weeks. The protonation states of the catalytic triad (Asp102, His57 and Ser195) were observed. These results confirmed that the nucleophilic reactivity of the hydroxyl group of Ser195 was increased by forming a hydrogen bond with His57. According to structural analysis, the trypsin-BPTI interfaces located at the scissile peptide and the active sites were inaccessible to solvent water, and the amide H atoms of P2' Arg17/I, Gly216/E and Gly193/E at the binding interface were protected from H/D exchange. In contrast, both the amide H atom of P1' Ala16/I of the scissile peptide bond P1-P1' and the H atom between His57 N(2) and Ser195 O(gamma) were replaced by D atoms. The hydrogen-bond networks at the S1 pocket were also confirmed and discussed from the viewpoint of substrate recognition. Moreover, the first neutron crystallographic structure of the Michaelis complex state of trypsin-BPTI is presented. X-ray and neutron protein crystallographic analysis of the trypsin-BPTI complex.,Kawamura K, Yamada T, Kurihara K, Tamada T, Kuroki R, Tanaka I, Takahashi H, Niimura N Acta Crystallogr D Biol Crystallogr. 2011 Feb;67(Pt 2):140-8. Epub 2011, Jan 15. PMID:21245536 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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