Article (Scientific journals)
Detection and Characterization of VIM-52, a New Variant of VIM-1 from a Klebsiella pneumoniae Clinical Isolate
de Barsy, Marie; Mercuri, Paola; Oueslati, Saoussen et al.
2021In Antimicrobial Agents and Chemotherapy, 65 (Issue 11), p. 02660-20
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Keywords :
antibiotic resistance; metallo-beta-lactamase; biochemical characterization
Abstract :
[en] ABSTRACT Over the last two decades, antimicrobial resistance has become a global health problem. In Gram-negative bacteria, metallo-b-lactamases (MBLs), which inactivate virtually all b-lactams, increasingly contribute to this phenomenon. The aim of this study is to characterize VIM-52, a His224Arg variant of VIM-1, identified in a Klebsiella pneumoniae clinical isolate. VIM-52 conferred lower MICs to cefepime and ceftazidime compared to VIM-1. These results were confirmed by steady-state kinetic measurements, where VIM-52 yielded a lower activity toward ceftazidime and cefepime but not against carbapenems. Residue 224 is part of the L10 loop (residues 221 to 241), which borders the active site. As Arg 224 and Ser 228 both play an important and interrelated role in enzymatic activity, stability, and substrate specificity for the MBLs, targeted mutagenesis at both positions was performed and further confirmed their crucial role for substrate specificity.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
de Barsy, Marie
Mercuri, Paola ;  Université de Liège - ULiège > Département des sciences de la vie > Macromolécules biologiques
Oueslati, Saoussen
Elisée, Eddy
Huang, Te-Din
Sacré, Pierre
Iorga, Bogdan I
Naas, Thierry
Galleni, Moreno ;  Université de Liège - ULiège > Département des sciences de la vie > Macromolécules biologiques
Bogaerts, Pierre
Language :
English
Title :
Detection and Characterization of VIM-52, a New Variant of VIM-1 from a Klebsiella pneumoniae Clinical Isolate
Publication date :
18 October 2021
Journal title :
Antimicrobial Agents and Chemotherapy
ISSN :
0066-4804
eISSN :
1098-6596
Publisher :
American Society for Microbiology, United States - District of Columbia
Volume :
65
Issue :
Issue 11
Pages :
e02660-20
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 October 2021

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