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Characterization of the AmpC β-Lactamase from Burkholderia multivorans.
Antimicrobial Agents and Chemotherapy 2018 October
Burkholderia multivorans is a member of the Burkholderia cepacia complex, a group of >20 related species of nosocomial pathogens that commonly infect individuals suffering from cystic fibrosis. β-Lactam antibiotics are recommended as therapy for infections due to B multivorans , which possesses two β-lactamase genes, bla penA and bla AmpC PenA is a carbapenemase with a substrate profile similar to that of the Klebsiella pneumoniae carbapenemase (KPC); in addition, expression of PenA is inducible by β-lactams in B multivorans Here, we characterize AmpC from B multivorans ATCC 17616. AmpC possesses only 38 to 46% protein identity with non- Burkholderia AmpC proteins (e.g., PDC-1 and CMY-2). Among 49 clinical isolates of B multivorans , we identified 27 different AmpC variants. Some variants possessed single amino acid substitutions within critical active-site motifs (Ω loop and R2 loop). Purified AmpC1 demonstrated minimal measurable catalytic activity toward β-lactams (i.e., nitrocefin and cephalothin). Moreover, avibactam was a poor inhibitor of AmpC1 ( Ki app > 600 μM), and acyl-enzyme complex formation with AmpC1 was slow, likely due to lack of productive interactions with active-site residues. Interestingly, immunoblotting using a polyclonal anti-AmpC antibody revealed that protein expression of AmpC1 was inducible in B multivorans ATCC 17616 after growth in subinhibitory concentrations of imipenem (1 μg/ml). AmpC is a unique inducible class C cephalosporinase that may play an ancillary role in B multivorans compared to PenA, which is the dominant β-lactamase in B multivorans ATCC 17616.
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