Mutational Effects on Carbapenem Hydrolysis of YEM-1, a New Subclass B2 Metallo-ß-Lactamase from Yersinia mollaretii.
Antimicrob Agents Chemother
; 64(9)2020 08 20.
Article
in En
| MEDLINE
| ID: mdl-32540974
ABSTRACT
Analysis of the genome sequence of Yersinia mollaretii ATCC 43969 identified the blaYEM gene, encoding YEM-1, a putative subclass B2 metallo-ß-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-ß-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 ß-lactam classes.
Key words
Full text:
1
Database:
MEDLINE
Main subject:
Beta-Lactamases
/
Carbapenems
Language:
En
Year:
2020
Type:
Article