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Mass spectra of the purified CMY-2 enzyme and the periplasmic extracts of representative CMY- and non-CMY-producing E. coli (a), K. pneumoniae (b), and E. aerogenes and P. mirabilis (c) isolates. Peaks corresponding to CMY β-lactamases are indicated with arrows with solid lines. The absence of the ca. 39,850-m/z peaks, representing CMY β-lactamases, is indicated with arrows with dotted lines for CMY producers and diamond-shaped arrows with dotted lines for non-CMY-producing isolates.
