title: beta-Lactamase of Lysobacter enzymogenes: cloning, characterization and expression of the gene and comparison of the enzyme to other lactamases.
abstract: The gene for the periplasmic beta-lactamase of Lysobacter enzymogenes was isolated as part of a 1017 bp EcoRI fragment and the nucleotide sequence of the gene was determined. It has a G+C content of 71.5% and encodes a 27 amino acid signal sequence and the mature beta-lactamase of 276 amino acids which has a mass of 29,146 Da. The enzyme appears to be unique to L. enzymogenes but its amino acid sequence shows a high degree of homology with the amino acid sequences of the lactamase from Citrobacter diversus and other Class A beta-lactamases. The beta-lactamase gene of L. enzymogenes was expressed in Escherichia coli using pUC118 as the vector. The production of active beta-lactamase was highest after the active growth phase of the expression host and reached levels which were about three times higher than those obtained with L. enzymogenes.
authors.affiliation: Department of Microbiology, University of Alberta, Edmonton, Canada.
authors.forename: G J
authors.initials: GJ
authors.lastname: Boras
authors.forename: S
authors.initials: S
authors.lastname: Au
authors.forename: K L
authors.initials: KL
authors.lastname: Roy
authors.forename: R G
authors.initials: RG
authors.lastname: von Tigerstrom
mesh_terms: D000595:Amino Acid Sequence; D001419:Bacteria / Q000201:enzymology* / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000235:genetics; D015870:Gene Expression; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid; D001618:beta-Lactamases / Q000096:biosynthesis / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; D001618:beta-Lactamases