Site-saturation mutagenesis of Tyr-105 reveals its importance in substrate stabilization and discrimination in TEM-1 beta-lactamase.


The conserved Class A beta-lactamase active site residue Tyr-105 was substituted by saturation mutagenesis in TEM-1 beta-lactamase from Escherichia coli in order to clarify its role in enzyme activity and in substrate stabilization and discrimination. Minimum inhibitory concentrations were calculated for E. coli cells harboring each Y105X mutant in the… (More)


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