title: Cloning and sequencing of the beta-lactamase I gene of Bacillus cereus 5/B and its expression in Bacillus subtilis.
abstract: The beta-lactamases of Bacillus cereus have attracted interest because they are secreted efficiently, because multiple enzymes are frequently present, and because their regulation has unusual features. beta-Lactamase I of strain 5/B is produced constitutively at a high level, and the exoenzyme appears to be several thousand daltons larger than the corresponding product of strain 569/H. We have cloned the gene for 5/B beta-lactamase I in Escherichia coli and B. subtilis and have sequenced the structural portion and the regulatory regions. The 5/B enzyme is produced at a low level in E. coli RR1(pRWY200) and remains cellbound. In B. subtilis it is formed in large amounts, and over 90% of it is released into the medium. There is a large degree of homology between the promoter and leader peptide regions of the 5/B and 569/H genes; both utilize UUG as the translation initiation codon (P. S. F. Mézes, R. W. Blacher, and J. O. Lampen, (J. Biol. Chem. 260:1218-1223, 1985). Although there are significant differences in the peptide segment where processing would be expected to occur, the NH2 terminus of the major 5/B product from B. subtilis BD170(pRWY215) is His-44, which is the same as the NH2 terminus of the major 569/H product from B. subtilis BD170(pRWM5).
authors.forename: W
authors.initials: W
authors.lastname: Wang
authors.forename: P S
authors.initials: PS
authors.lastname: Mézes
authors.forename: Y Q
authors.initials: YQ
authors.lastname: Yang
authors.forename: R W
authors.initials: RW
authors.lastname: Blacher
authors.forename: J O
authors.initials: JO
authors.lastname: Lampen
mesh_terms: D000595:Amino Acid Sequence; D001409:Bacillus cereus / Q000201:enzymology / Q000235:genetics*; D001412:Bacillus subtilis / Q000201:enzymology / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D005796:Genes; D005798:Genes, Bacterial; D009693:Nucleic Acid Hybridization; D010405:Penicillinase / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D010957:Plasmids; D014176:Protein Biosynthesis
chemical_list: D004262:DNA Restriction Enzymes; D010405:Penicillinase