Article (Scientific journals)
Cloning of a Chryseobacterium (Flavobacterium) meningosepticum chromosomal gene (blaA(CME)) encoding an extended-spectrum class A beta-lactamase related to the Bacteroides cephalosporinases and the VEB-1 and PER beta-lactamases.
Rossolini, G. M.; Franceschini, N.; Lauretti, L. et al.
1999In Antimicrobial Agents and Chemotherapy, 43 (9), p. 2193-9
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Keywords :
Base Sequence; Cloning, Molecular; Electrophoresis, Polyacrylamide Gel; Escherichia coli/enzymology; Flavobacterium/enzymology/genetics; Genetic Vectors; Molecular Sequence Data; Plasmids/genetics; Restriction Mapping; beta-Lactamases/classification/genetics/isolation & purification
Abstract :
[en] In addition to the BlaB metallo-beta-lactamase, Chryseobacterium (Flavobacterium) meningosepticum CCUG 4310 (NCTC 10585) constitutively produces a 31-kDa active-site serine beta-lactamase, named CME-1, with an alkaline isoelectric pH. The blaA(CME) gene that encodes the latter enzyme was isolated from a genomic library constructed in the Escherichia coli plasmid vector pACYC184 by screening for cefuroxime-resistant clones. Sequence analysis revealed that the CME-1 enzyme is a new class A beta-lactamase structurally divergent from the other members of this class, being most closely related to the VEB-1 (also named CEF-1) and PER beta-lactamases and the Bacteroides chromosomal cephalosporinases. The blaA(CME) determinant is located on the chromosome and exhibits features typical of those of C. meningosepticum resident genes. The CME-1 protein was purified from an E. coli strain that overexpresses the cloned gene via a T7-based expression system by means of an anion-exchange chromatography step followed by a gel permeation chromatography step. Kinetic parameters for several substrates were determined. CME-1 is a clavulanic acid-susceptible extended-spectrum beta-lactamase that hydrolyzes most cephalosporins, penicillins, and monobactams but that does not hydrolyze cephamycins and carbapenems. The enzyme exhibits strikingly different kinetic parameters for different classes of beta-lactams, with both K(m) and k(cat) values much higher for cephalosporins than for penicillins and monobactams. However, the variability of both kinetic parameters resulted in overall similar acylation rates (k(cat)/K(m) ratios) for all types of beta-lactam substrates.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Rossolini, G. M.
Franceschini, N.
Lauretti, L.
Caravelli, B.
Riccio, M. L.
Galleni, Moreno ;  Université de Liège - ULiège
Frère, Jean-Marie  ;  Université de Liège > Département des sciences de la vie > Centre d'ingénierie des protéines
Amicosante, G.
Language :
English
Title :
Cloning of a Chryseobacterium (Flavobacterium) meningosepticum chromosomal gene (blaA(CME)) encoding an extended-spectrum class A beta-lactamase related to the Bacteroides cephalosporinases and the VEB-1 and PER beta-lactamases.
Publication date :
1999
Journal title :
Antimicrobial Agents and Chemotherapy
ISSN :
0066-4804
eISSN :
1098-6596
Publisher :
American Society for Microbiology, Washington, United States - District of Columbia
Volume :
43
Issue :
9
Pages :
2193-9
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 December 2015

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