National Center for
2M5D: Solution Structure of the Bacillus cereus Metallo-Beta-Lactamase BcII in Complex with R-Thiomandelic Acid
Solution structures of the Bacillus cereus metallo-beta-lactamase BcII and its complex with the broad spectrum inhibitor R-thiomandelic acid
Biochem. J. (2013) 456 p.397-407» All references (2)
Metallo-beta-lactamases, enzymes which inactivate beta-lactam antibiotics, are of increasing biological and clinical significance as a source of antibiotic resistance in pathogenic bacteria. In the present study we describe the high-resolution solution NMR structures of the Bacillus cereus metallo-beta-lactamase BcII and of its complex with R-thiomandelic acid, a broad-spectrum inhibitor of metallo-beta-lactamases. This is the first reported solution structure of any metallo-beta-lactamase. There are differences between the solution structure of the free enzyme and previously reported crystal structures in the loops flanking the active site, which are important for substrate and inhibitor binding and catalysis. The binding of R-thiomandelic acid and the roles of active-site residues are defined in detail. Changes in the enzyme structure upon inhibitor binding clarify the role of the mobile beta3-beta4 loop. Comparisons with other metallo-beta-lactamases highlight the roles of individual amino-acid residues in the active site and the beta3-beta4 loop in inhibitor binding and provide information on the basis of structure-activity relationships among metallo-beta-lactamase inhibitors.