2fmj | pdb_00002fmj

220-loop mutant of streptomyces griseus trypsin

spinqualitylabelsall models 2fmj, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2fmj is a 1 chain structure with sequence from Streptomyces griseus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, SO4 Related: 1sgt, 1os8, 1oss Gene: sprT (Streptomyces griseus) 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 Serine proteases of the chymotrypsin family show a dichotomous amino acid distribution for residue 225. Enzymes carrying Tyr at position 225 are activated by Na(+), whereas those carrying Pro are devoid of Na(+) binding and activation. Previous studies have demonstrated that the Y225P conversion is sufficient to abrogate Na(+) activation in several enzymes. However, the reverse substitution P225Y is necessary but not sufficient to introduce Na(+) binding and activation. Here we report that Streptomyces griseus trypsin, carrying Pro-225, can be engineered into a Na(+)-activated enzyme by replacing residues in the 170, 186, and 220 loops to those of coagulation factor Xa. The findings represent the first instance of an engineered Na(+)-activated enzyme and a proof of principle that should enable the design of other proteases with enhanced catalytic activity and allosteric regulation mediated by monovalent cation binding. Conversion of trypsin into a Na(+)-activated enzyme.,Page MJ, Bleackley MR, Wong S, MacGillivray RT, Di Cera E Biochemistry. 2006 Mar 7;45(9):2987-93. PMID:16503653 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Trypsin

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