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Structures of FOX-4 Cephamycinase in Complex with Transition-State Analog Inhibitors.


ABSTRACT: Boronic acid transition-state analog inhibitors (BATSIs) are partners with ?-lactam antibiotics for the treatment of complex bacterial infections. Herein, microbiological, biochemical, and structural findings on four BATSIs with the FOX-4 cephamycinase, a class C ?-lactamase that rapidly hydrolyzes cefoxitin, are revealed. FOX-4 is an extended-spectrum class C cephalosporinase that demonstrates conformational flexibility when complexed with certain ligands. Like other ?-lactamases of this class, studies on FOX-4 reveal important insights into structure-activity relationships. We show that SM23, a BATSI, shows both remarkable flexibility and affinity, binding similarly to other ?-lactamases, yet retaining an IC50 value < 0.1 ?M. Our analyses open up new opportunities for the design of novel transition-state analogs of class C enzymes.

SUBMITTER: Lefurgy ST 

PROVIDER: S-EPMC7277225 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature

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Boronic acid transition-state analog inhibitors (BATSIs) are partners with β-lactam antibiotics for the treatment of complex bacterial infections. Herein, microbiological, biochemical, and structural findings on four BATSIs with the FOX-4 cephamycinase, a class C β-lactamase that rapidly hydrolyzes cefoxitin, are revealed. FOX-4 is an extended-spectrum class C cephalosporinase that demonstrates conformational flexibility when complexed with certain ligands. Like other β-lactamases of this class,  ...[more]

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