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An analysis of the genome sequence of Yersinia mollaretii ATCC 43969 identified the blaYEM gene encoding YEM-1, a putative subclass B2 metallo-β-lactamase. The objectives of our work were to produce, purify and complete the kinetic characterization of YEM-1. YEM-1 displayed the narrowest substrate range among known subclass B2 metallo-β-lactamases since it can hydrolyze imipenem but not other carbapenems, such as biapenem, meropenem, doripenem and ertapenem, with a high catalytic efficiency. A possible explanation of this activity prof