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CMY-30, a Val211Gly mutant of CMY-2 cephalosporinase, was derived by mutagenesis. The hydrolytic efficiency of CMY-30 against expanded-spectrum cephalosporins was higher than that of CMY-2 due to increased k(cat) values. Findings indicate a role of the Omega loop residue 211 in determining the substrate specificities of CMYs also corroborated by modeling studies.
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Kotsakis et al. (2009) studied this question.
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