Structural Basis for Imipenem Inhibition of Class C beta-lactamases
Beadle, B.M., Shoichet, B.K.(2002) Antimicrob Agents Chemother 46: 3978-3980
- PubMed: 12435704 
- DOI: https://doi.org/10.1128/AAC.46.12.3978-3980.2002
- Primary Citation of Related Structures:  
1LL5 - PubMed Abstract: 
To determine how imipenem inhibits the class C beta-lactamase AmpC, the X-ray crystal structure of the acyl-enzyme complex was determined to a resolution of 1.80 A. In the complex, the lactam carbonyl oxygen of imipenem has flipped by approximately 180 degrees compared to its expected position; the electrophilic acyl center is thus displaced from the point of hydrolytic attack. This conformation resembles that of imipenem bound to the class A enzyme TEM-1 but is different from that of moxalactam bound to AmpC.
Organizational Affiliation: 
Department of Molecular Pharmacology and Biological Chemistry, Northwestern University, Chicago, Illinois 60611-3008, USA.