BUT-1: a new member in the chromosomal inducible class C beta-lactamases family from a clinical isolate of Buttiauxella sp.
An atypical Enterobacteriaceae strain with a beta-lactam susceptibility pattern of inducible cephalosporinase was isolated in Tenon Hospital (Paris, France) from a patient's skull wound infection. Identifications by the API-50CHE biochemical system and 16S rRNA gene sequencing concluded that it was a member of the Buttiauxella genus. The bla gene was cloned and sequenced. The deduced translated product was a 383-amino acid protein (BUT-1) with 75-78% identity with the chromosomal AmpC beta-lactamases of Citrobacter freundii, Enterobacter aerogenes, Enterobacter cloacae and Escherichia coli. The isoelectric point of 9.0 and the kinetic constants of BUT-1 were comparable with results described for other Ambler class C enzymes. bla(BUT-1) and the associated ampR transcriptional regulator gene were divergently transcribed from a common intercistronic region, a genetic organization already described for other inducible class C beta-lactamases. The deduced amino acid sequence of AmpR shared 85% and 81% identity with AmpR from E. cloacae and C. freundii respectively.
Laboratoire de Bactériologie, Hôpital Tenon, UFR Saint-Antoine, UPRES EA 2392, 4, rue de la Chine, Paris, France.
Vincent
V
Fihman
Martin
M
Rottman
Yahia
Y
Benzerara
Françoise
F
Delisle
Roger
R
Labia
Alain
A
Philippon
Guillaume
G
Arlet
D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000378:metabolism; D001483:Base Sequence; D003001:Cloning, Molecular; D004755:Enterobacteriaceae / Q000145:classification / Q000201:enzymology / Q000235:genetics*; D007526:Isoelectric Point; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000032:analysis / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D001618:beta-Lactamases / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism
D001426:Bacterial Proteins; D012336:RNA, Ribosomal, 16S; C071526:AmpR protein, Bacteria; C472503:beta-lactamase BUT-1, Buttiauxella; C048795:AmpC beta-lactamases; D001618:beta-Lactamases