Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 64, Issue 9, Pages -Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.00105-20
Keywords
Yersinia mollaretii; antibiotic resistance; carbapenemase; metallo-beta-lactamases
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Funding
- Erasmus student fellowship from the University of Federico II of Naples (Italy)
- Erasmus+ fellowship for traineeship from the University of L'Aquila (Italy)
- University of Liege
- Fund for Scientific Research (FRS-FNRS) Belgium
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Analysis of the genome sequence of Yersinia mollaretii ATCC 43969 identified the bla(YEM) gene, encoding YEM-1, a putative subclass B2 metallo-beta-lactamase. The objectives of our work were to produce and purify YEM-1 and to complete its kinetic characterization. YEM-1 displayed the narrowest substrate range among known subclass B2 metallo-beta-lactamases, since it can hydrolyze imipenem, but not other carbapenems, such as biapenem, meropenem, doripenem, and ertapenem, with high catalytic efficiency. A possible explanation of this activity profile is the presence of tyrosine at residue 67 (loop L1), threonine at residue 156 (loop L2), and serine at residue 236 (loop L3). We showed that replacement of Y67 broadened the activity profile of the enzyme for all carbapenems but still resulted in poor activity toward the other beta-lactam classes.
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