title: Transcription of gene in an acrystalliferous strain of Bacillus thuringiensis XBU001 positively regulated by the metalloprotease camelysin gene at the onset of stationary phase.
abstract: The calY gene, encoding metalloprotease camelysin in the Bacillus thuringiensis acrystalliferous strain XBU001, was amplified and sequenced. The camelysin from the calY sequence was 199 amino acids in size (c. 22 000 Da). The temperature-sensitive plasmid pKESX was used to construct a metalloprotease camelysin-deficient strain of B. thuringiensis. The calY gene was replaced by an erythromycin-resistant gene in KCTF. Sodium dodecyl sulfate polyacrylamide gel electrophoresis and MS analysis showed that the metalloprotease InhA was not expressed after knocking out the gene calY. The temperature-sensitive plasmid pKPC was used to construct a metalloprotease camelysin complementation strain KCTFC. The InhA protein was found in KCTFC. Analysis of the expression of InhA in the wild-type strain KCTF12, camelysin-deficient and complementation strains indicated that inhA expression depended on camelysin. Although camelysin did not directly regulate the expression of the InhA through binding to the promoter of the inhA, the results suggest that camelysin can positively regulate the expression of the InhA protein.
authors.affiliation: Key Laboratory of Microbial Molecular Biology of Hunan Province, College of Life Science, Hunan Normal University, Changsha, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Yin
authors.forename: Xuezhi
authors.initials: X
authors.lastname: Ding
authors.forename: Liqiu
authors.initials: L
authors.lastname: Xia
authors.forename: Ziquan
authors.initials: Z
authors.lastname: Yu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Lv
authors.forename: Shengbiao
authors.initials: S
authors.lastname: Hu
authors.forename: Shaoya
authors.initials: S
authors.lastname: Huang
authors.forename: Zhenping
authors.initials: Z
authors.lastname: Cao
authors.forename: Xiuqing
authors.initials: X
authors.lastname: Xiao
mesh_terms: D001413:Bacillus thuringiensis / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D008666:Metalloendopeptidases / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D008666:Metalloendopeptidases; C438729:camelysin