期刊
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
卷 64, 期 11, 页码 -出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.00562-20
关键词
narrow-spectrum beta-lactamase; CTX-M-type enzyme; mecillinam; cefotaxime; N132D
资金
- National Natural Science Foundation of China [81673479, 81872909, 81773785, 81991531]
- Shanghai Pujiang Program [16PJD010]
Here, we report a novel narrow-spectrum beta-lactamase CTX-M-215 identified in an Escherichia coli clinical isolate in China and conferring high-level resistance to mecillinam but not to cefotaxime. CTX-M-215 differed from CTX-M-125, a CTX-M extended-spectrum beta-lactamase (ESBL), by an N132D substitution, which decreased hydrolytic activities toward penicillins and cephalosporins except for mecillinam. High similarity was observed between CTX-M-215- and CTX-M-125-bearing plasmids, carried by different isolates in the same patient, indicating in vivo evolution of CTX-M-215 from CTX-M-125.
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