[en] beta-Lactamases are the main cause of bacterial resistance to penicillins and cephalosporins. Class A beta-lactamases, the largest group of beta-lactamases, have been found in many bacterial strains, including mycobacteria, for which no beta-lactamase structure has been previously reported. The crystal structure of the class A beta-lactamase from Mycobacterium fortuitum (MFO) has been solved at 2.13-A resolution. The enzyme is a chromosomally encoded broad-spectrum beta-lactamase with low specific activity on cefotaxime. Specific features of the active site of the class A beta-lactamase from M. fortuitum are consistent with its specificity profile. Arg278 and Ser237 favor cephalosporinase activity and could explain its broad substrate activity. The MFO active site presents similarities with the CTX-M type extended-spectrum beta-lactamases but lacks a specific feature of these enzymes, the VNYN motif (residues 103 to 106), which confers on CTX-M-type extended-spectrum beta-lactamases a more efficient cefotaximase activity.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Sauvage, Eric ; Université de Liège - ULiège > Centre d'ingénierie des protéines
Fonze, Eveline
Quinting, Birgit
Galleni, Moreno ; Université de Liège - ULiège > Département des sciences de la vie > Macromolécules biologiques
Frère, Jean-Marie ; Université de Liège - ULiège > Centre d'ingénierie des protéines
Charlier, Paulette ; Université de Liège - ULiège > Département des sciences de la vie > Cristallographie des macromolécules biologiques
Language :
English
Title :
Crystal structure of the Mycobacterium fortuitum class A beta-lactamase: structural basis for broad substrate specificity.
Publication date :
2006
Journal title :
Antimicrobial Agents and Chemotherapy
ISSN :
0066-4804
eISSN :
1098-6596
Publisher :
American Society for Microbiology (ASM), Washington, United States - District of Columbia
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