1amh

UNCOMPLEXED RAT TRYPSIN MUTANT WITH ASP 189 REPLACED WITH SER (D189S)

spinqualitylabelsall models 1amh, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1amh is a 2 chain structure with sequence from Rattus rattus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA Activity: Trypsin, with EC number 3.4.21.4 Resources: FirstGlance, OCA, RCSB, PDBsum 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 Trypsin mutant Asp189Ser, first described by Graf et al. [Graf, L., Jancso, A., Szilagyi, L., Hegyi, G., Pinter, K., Naray-Szabo, G., Hepp, J., Medzihradszky, K. & Rutter, W.J. (1988) Proc. Natl Acad. Sci. USA 85, 4961-4965] has played an important role in recent studies on the structural basis of substrate-specific catalysis by serine proteases. The present work reports the three-dimensional structure of this mutant crystallized in unliganded form: the first unliganded rat trypsin structure reported. The X-ray structure of the Asp189Ser trypsin mutant in complex with bovine pancreatic trypsin inhibitor is already known. The X-ray structure of free Asp189Ser rat trypsin revealed that the single amino acid mutation at the bottom of the substrate binding pocket of trypsin resulted in extensive structural changes around the mutated site and in dimerization of the mutant, in contrast with the complexed enzyme the structure of which is practically the same as that of wild-type trypsin. The structural rearrangement in the mutant was shown to be restricted to the activation domain region providing further evidence for the allosteric property of this structural-functional unit of the enzyme. This study supports our view that the plasticity of the activation domain may play an important role in the mechanism of substrate-specific serine protease action. The three-dimensional structure of Asp189Ser trypsin provides evidence for an inherent structural plasticity of the protease.,Szabo E, Bocskei Z, Naray-Szabo G, Graf L Eur J Biochem. 1999 Jul;263(1):20-6. PMID:10429182 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Trypsin

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