Article (Scientific journals)
Solution structures of the Bacillus cereus metallo-β-lactamase BcII and its complex with the broad spectrum inhibitor R-thiomandelic acid
Karsisiotis, Andreas Ioannis; Damblon, Christian; Roberts, Gordon C K
2013In Biochemical Journal, 456, p. 397-407
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Keywords :
antibiotic resistance; enzyme structure; inhibitor binding; metallo-β-lactamase; NMR spectroscopy; zinc enzyme
Abstract :
[en] Metallo-β-lactamases, enzymes which inactivate β-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-β-lactamase BcII and of its complex with R-thiomandelic acid, a broadspectrum inhibitor of metallo-β-lactamases. This is the first reported solution structure of any metallo-β-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 β3–β4 loop. Comparisons with other metallo-β- lactamases highlight the roles of individual amino-acid residues in the active site and the β3–β4 loop in inhibitor binding and provide information on the basis of structure–activity relationships among metallo-β-lactamase inhibitors.
Disciplines :
Chemistry
Author, co-author :
Karsisiotis, Andreas Ioannis
Damblon, Christian ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie biologique structurale
Roberts, Gordon C K
Language :
English
Title :
Solution structures of the Bacillus cereus metallo-β-lactamase BcII and its complex with the broad spectrum inhibitor R-thiomandelic acid
Publication date :
2013
Journal title :
Biochemical Journal
ISSN :
0264-6021
eISSN :
1470-8728
Publisher :
Portland Press, London, United Kingdom
Volume :
456
Pages :
397-407
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 December 2014

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