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The class A ?-lactamase FTU-1 is native to Francisella tularensis.


ABSTRACT: The class A ?-lactamase FTU-1 produces resistance to penicillins and ceftazidime but not to any other ?-lactam antibiotics tested. FTU-1 hydrolyzes penicillin antibiotics with catalytic efficiencies of 10(5) to 10(6) M(-1) s(-1) and cephalosporins and carbapenems with catalytic efficiencies of 10(2) to 10(3) M(-1) s(-1), but the monobactam aztreonam and the cephamycin cefoxitin are not substrates for the enzyme. FTU-1 shares 21 to 34% amino acid sequence identity with other class A ?-lactamases and harbors two cysteine residues conserved in all class A carbapenemases. FTU-1 is the first weak class A carbapenemase that is native to Francisella tularensis.

SUBMITTER: Antunes NT 

PROVIDER: S-EPMC3264220 | biostudies-literature | 2012 Feb

REPOSITORIES: biostudies-literature

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The class A β-lactamase FTU-1 is native to Francisella tularensis.

Antunes Nuno T NT   Frase Hilary H   Toth Marta M   Vakulenko Sergei B SB  

Antimicrobial agents and chemotherapy 20111114 2


The class A β-lactamase FTU-1 produces resistance to penicillins and ceftazidime but not to any other β-lactam antibiotics tested. FTU-1 hydrolyzes penicillin antibiotics with catalytic efficiencies of 10(5) to 10(6) M(-1) s(-1) and cephalosporins and carbapenems with catalytic efficiencies of 10(2) to 10(3) M(-1) s(-1), but the monobactam aztreonam and the cephamycin cefoxitin are not substrates for the enzyme. FTU-1 shares 21 to 34% amino acid sequence identity with other class A β-lactamases  ...[more]

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