Structure and Molecular Recognition Mechanism of IMP-13 Metallo-β-Lactamase
Charlotte A. Softley, Krzysztof M. Żak, Mark J. Bostock, Roberto Fino, Richard Xu Zhou, Marta Kolonko, Ramona Mejdi-Nitiu, Hannelore Meyer, Michael Sattler, Grzegorz M. Popowicz
Abstract
found in clinical outbreaks globally, and characterize the binding using solution nuclear magnetic resonance spectroscopy and molecular dynamics simulations. The crystal structures of apo IMP-13 and IMP-13 bound to four clinically relevant carbapenem antibiotics (doripenem, ertapenem, imipenem, and meropenem) are presented. Active-site plasticity and the active-site loop, where a tryptophan residue stabilizes the antibiotic core scaffold, are essential to the substrate-binding mechanism. The conserved carbapenem scaffold plays the most significant role in IMP-13 binding, explaining the broad substrate specificity. The observed plasticity and substrate-locking mechanism provide opportunities for rational drug design of novel metallo-β-lactamase inhibitors, essential in the fight against antibiotic resistance.