Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 62, Issue 4, Pages -Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.02079-17
Keywords
SPM-1; beta-lactamases; mechanisms of resistance; metallo-beta-lactamase; substrate profile
Categories
Funding
- National Institutes of Health [R01AI100560]
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT)
- CONICET
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Metallo-beta-lactamases (MBLs) are the major group of carbapenemases produced by bacterial pathogens. The design of MBL inhibitors has been limited by, among other issues, incomplete knowledge about how these enzymes modulate substrate recognition. While most MBLs are broad-spectrum enzymes, B2 MBLs are exclusive carbapenemases. This narrower substrate profile has been attributed to a sequence insertion present in B2 enzymes that limits accessibility to the active site. In this work, we evaluate the role of sequence insertions naturally occurring in the B2 enzyme Sfh-I and in the broad-spectrum B1 enzyme SPM-1. We engineered a chimeric protein in which the sequence insertion of SPM-1 was replaced by the one present in Sfh-I. The chimeric variant is a selective cephalosporinase, revealing that the substrate profile of MBLs can be further tuned depending on the protein context. These results also show that the stable scaffold of MBLs allows a modular engineering much richer than the one observed in nature.
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