Deletion mutations conferring substrate spectrum extension in the class A ?-lactamase.
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ABSTRACT: We describe four new deletion mutations in a class A ?-lactamase PenA in Burkholderia thailandensis, each conferring an extended substrate spectrum. Single-amino-acid deletions T171del, I173del, and P174del and a two-amino-acid deletion, R165_T167delinsP, occurred in the omega loop, increasing the flexibility of the binding cavity. This rare collection of mutations has significance, allowing exploration of the diverse evolutionary trajectories of ?-lactamases and as potential future mutations conferring high-level ceftazidime resistance on isolates from clinical settings, compared with amino acid substitution mutations.
SUBMITTER: Hwang J
PROVIDER: S-EPMC4187959 | biostudies-literature | 2014 Oct
REPOSITORIES: biostudies-literature
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