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We describe a deletion mutation in a class A β-lactamase, PenA, ofBurkholderia thailandensis that extended the substrate spectrum of the enzyme to include ceftazidime. Glu168del was located in a functional domain called the omega loop causing expansion of the space in the loop, which in turn increased flexibility at the active site. This deletion mutation represents a rare but significant alternative mechanical path to substrate spectrum extension in PenA besides more common substitution mutations.

Substrate Spectrum Extension of PenA in Burkholderia thailandensis with a Single Amino Acid Deletion, Glu168del