1. Transcription of gene in an acrystalliferous strain of Bacillus thuringiensis XBU001 positively regulated by the metalloprotease camelysin gene at the onset of stationary phase
- Author
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Liqiu Xia, Shaoya Huang, Ziquan Yu, Shengbiao Hu, Xiuqing Xiao, Yuan Lv, Jia Yin, Xuezhi Ding, and Zhenping Cao
- Subjects
biology ,INHA ,biology.organism_classification ,Microbiology ,Molecular biology ,Complementation ,Plasmid ,Biochemistry ,Transcription (biology) ,Bacillus thuringiensis ,Genetics ,Molecular Biology ,Polyacrylamide gel electrophoresis ,Gene ,Gene knockout - Abstract
The cal Y gene, encoding metalloprotease camelysin in the Bacillus thuringiensis acrystalliferous strain XBU001, was amplified and sequenced. The camelysin from the cal Y sequence was 199 amino acids in size ( c . 22000Da). The temperature-sensitive plasmid pKESX was used to construct a metalloprotease camelysin-deficient strain of B. thuringiensis . The cal Y 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 cal Y. 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 inh A expression depended on camelysin. Although camelysin did not directly regulate the expression of the InhA through binding to the promoter of the inh A, the results suggest that camelysin can positively regulate the expression of the InhA protein.
- Published
- 2011
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