Some Properties of the Clostridium butyricum Group -Lactamase

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Abstract
C. butyricum strain CB269 produces a .beta.-lactamase. The substrate profile of this enzyme, as characterized by the microiodometric method, was that of a penicillinase: activity was slightly higher on ampicillin than on benzylpenicillin; carbenicillin and methicillin were hydrolyzed at lower rates. There was poor activity with cephalosporins. The enzyme was excreted during growth and was inducible to a limited extent by cloxacillin or cefoxitin. The isoelectric point of the enzyme was approximately 4.1.

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