Download MendeleyStructural and mechanistic insights into the inhibition of class C beta-lactamases through the adenylylation of the nucleophilic serine.
Kim, M.K., An, Y.J., Na, J.H., Seol, J.H., Ryu, J.Y., Lee, J.W., Kang, L.W., Chung, K.M., Lee, J.H., Moon, J.H., Lee, J.S., Cha, S.S.(2017) J Antimicrob Chemother 72: 735-743
- PubMed: 27999057
- DOI: https://doi.org/10.1093/jac/dkw491
- Primary Citation of Related Structures:
5F1F, 5F1G, 5GZW - PubMed Abstract:
: Investigation into the adenylylation of the nucleophilic serine in AmpC BER and CMY-10 extended-spectrum class C β-lactamases. : The formation and the stability of the adenylate adduct were examined by X-ray crystallography and MS. Inhibition assays for kinetic parameters were performed by monitoring the hydrolytic activity of AmpC BER and CMY-10 using nitrocefin as a reporter substrate. The effect of adenosine 5'-(P-acetyl)monophosphate (acAMP) on the MIC of ceftazidime was tested with four Gram-negative clinical isolates. : The crystal structures and MS analyses confirmed the acAMP-mediated adenylylation of the nucleophilic serine in AmpC BER and CMY-10. acAMP inhibited AmpC BER and CMY-10 through the adenylylation of the nucleophilic serine, which could be modelled as a two-step mechanism. The initial non-covalent binding of acAMP to the active site is followed by the covalent attachment of its AMP moiety to the nucleophilic serine. The inhibition efficiencies ( k inact / K I ) of acAMP against AmpC BER and CMY-10 were determined to be 320 and 140 M -1 s -1 , respectively. The combination of ceftazidime and acAMP reduced the MIC of ceftazidime against the tested bacteria. : Our structural and kinetic studies revealed the detailed mechanism of adenylylation of the nucleophilic serine and may serve as a starting point for the design of novel class C β-lactamase inhibitors on the basis of the nucleotide scaffold.
Organizational Affiliation:
Marine Biotechnology Research Center, Korea Institute of Ocean Science and Technology (KIOST), Ansan, 15627, Republic of Korea.
