1iav
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STRUCTURE ON NATIVE (ASN 87) SUBTILISIN FROM BACILLUS LENTUS
OverviewOverview
The three-dimensional structures of engineered variants of Bacillus lentus, subtilisin having increased enzymatic activity, K27R/N87S/V104Y/N123S/T274A (RSYSA) and N76D/N87S/S103A/V104I (DSAI), were, determined by X-ray crystallography. In addition to identifying changes in, atomic position we report a method that identifies protein segments having, altered flexibility. The method utilizes a statistical analysis of, variance to delineate main-chain temperature factors that represent, significant departures from the overall variance between equivalent, regions seen throughout the structure. This method reveals changes in, main-chain mobility in both variants. Residues 125-127 have increased, mobility in the RSYSA variant while residues 100-104 have decreased, mobility in the DSAI variant. These segments are located at the, substrate-binding site and changes in their mobility are believed to, relate to the observed changes in proteolytic activity. The effect of, altered crystal lattice contacts on segment flexibility becomes apparent, when identical variants, determined in two crystal forms, are compared, with the native enzyme.
About this StructureAbout this Structure
1IAV is a Single protein structure of sequence from Bacillus lentus with SO4 and CA as ligands. This structure superseeds the now removed PDB entry 1C13. Active as Subtilisin, with EC number 3.4.21.62 Full crystallographic information is available from OCA.
ReferenceReference
Engineered Bacillus lentus subtilisins having altered flexibility., Graycar T, Knapp M, Ganshaw G, Dauberman J, Bott R, J Mol Biol. 1999 Sep 10;292(1):97-109. PMID:10493860
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