title: Transcriptional regulation of the Bacillus thuringiensis subsp. thompsoni crystal protein gene operon.
abstract: The two predominant polypeptides of the Bacillus thuringiensis subsp. thompsoni crystal are encoded by the cry40 and cry34 genes. These crystal protein genes are located in an operon. Western analysis (immunoblotting) demonstrated that the operon promoter activity was located in the region upstream of the cry40 gene. The Cry34 protein was expressed only when the upstream promoter region was present. The crystal protein genes are the only cistrons in the operon, and they are expressed during sporulation, with the highest transcript levels detected early in sporulation (1.5 to 3 h after the onset of sporulation). Transcription initiates from two adjacent sites located 84 and 85 bases upstream of the cry40 translational start codon. The B. thuringiensis subsp. thompsoni crystal protein gene operon promoter aligned with other crystal protein gene promoters, which are activated from early to midsporulation and transcribed in vitro by the B. thuringiensis RNA polymerase E sigma 35.
authors.affiliation: Department of Plant Biology, University of California, Berkeley 94720.
authors.forename: K L
authors.initials: KL
authors.lastname: Brown
mesh_terms: D001413:Bacillus thuringiensis / Q000235:genetics* / Q000378:metabolism*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics*; D001427:Bacterial Toxins / Q000096:biosynthesis / Q000235:genetics; D001483:Base Sequence; D015152:Blotting, Northern; D017931:DNA Primers; D004731:Endotoxins / Q000096:biosynthesis* / Q000235:genetics*; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D006460:Hemolysin Proteins; D008969:Molecular Sequence Data; D009876:Operon; D010957:Plasmids; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic; D012329:RNA, Bacterial / Q000096:biosynthesis / Q000302:isolation & purification; D012689:Sequence Homology, Nucleic Acid; D014158:Transcription, Genetic
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D017931:DNA Primers; D004731:Endotoxins; D006460:Hemolysin Proteins; D012329:RNA, Bacterial; C030956:insecticidal crystal protein, Bacillus Thuringiensis