One mechanism by which bacteria can escape the action of beta-lactam antibiotics is the production of metallo-beta-lactamases. Inhibition of these enzymes should restore the action of these widely used antibiotics. The tetrameric enzyme L1 from Stenotrophomonas maltophilia was used as a model system to determine a series of high-resolution crystal structures of apo, mono and bi-metal substituted proteins as well as protein-inhibitor complexes ...
One mechanism by which bacteria can escape the action of beta-lactam antibiotics is the production of metallo-beta-lactamases. Inhibition of these enzymes should restore the action of these widely used antibiotics. The tetrameric enzyme L1 from Stenotrophomonas maltophilia was used as a model system to determine a series of high-resolution crystal structures of apo, mono and bi-metal substituted proteins as well as protein-inhibitor complexes. Unexpectedly, although the apo structure revealed only few significant structural differences from the holo structure, some inhibitors were shown to induce amino acid side-chain rotations in the tightly packed active site. Moreover, one inhibitor employs a new binding mode in order to interact with the di-zinc center. This structural information could prove essential in the process of elucidation of the mode of interaction between a putative lead compound and metallo-beta-lactamases, one of the main steps in structure-based drug design.
Related Citations:
Update of the standard numbering scheme for class B beta-lactamases Garau, G., Garcia-Saez, I., Bebrone, C., Anne, C., Mercuri, P., Galleni, M., Frere, J.M., Dideberg, O. (2004) Antimicrob Agents Chemother 48: 2347
The 3-D structure of a zinc metallo-beta-lactamase from Bacillus cereus reveals a new type of protein fold Carfi, A., Pares, S., Duee, E., Galleni, M., Duez, C., Frere, J.M., Dideberg, O. (1995) EMBO J 14: 4914
Organizational Affiliation:
Institut de Biologie Structurale Jean-Pierre Ebel (UMR 5075;CNRS;CEA;UJF), 41, rue Jules Horowitz, F-38027 Grenoble Cedex 1, France.
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