title: Crystallization and preliminary X-ray diffraction study of the class A beta-lactamase SED-1 and its mutant SED-G238C from Citrobacter sedlakii.
abstract: SED-1, a class A beta-lactamase from Citrobacter sedlakii, is a CTX-M-type extended-spectrum beta-lactamase that has the ability to hydrolyze expanded-spectrum cephalosporins such as cefotaxime. SED-1 and a SED mutant in which Gly238 has been replaced by a cysteine, forming a disulfide bridge with the other Cys residue located at position 69 (SED-G238C), have been crystallized. The crystals belong to the monoclinic space group C2, with unit-cell parameters a = 188.09, b = 73.65, c = 105.41 A, beta = 121.67 degrees for SED-1 and a = 187.64, b = 73.2, c = 103.89 A, beta = 121.89 degrees for the SED-G238C mutant. X-ray diffraction data were collected to maximum resolutions of 2.4 A for SED-1 and 2.0 A for SED-G238C.
authors.affiliation: LRMA-Pitié-Salpêtrière, Service de Bactériologie, Faculté de Médecine Pitié-Salpêtrière, Université Pierre et Marie Curie (Paris VI), Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Petrella
authors.forename: L
authors.initials: L
authors.lastname: Pernot
authors.forename: W
authors.initials: W
authors.lastname: Sougakoff
mesh_terms: D002847:Chromatography, Agarose; D002954:Citrobacter / Q000201:enzymology* / Q000235:genetics; D003460:Crystallization; D018360:Crystallography, X-Ray; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D016297:Mutagenesis, Site-Directed; D016133:Polymerase Chain Reaction; D001618:beta-Lactamases / Q000737:chemistry* / Q000235:genetics
chemical_list: D004269:DNA, Bacterial; C436758:beta-lactamase Sed-1; D001618:beta-Lactamases