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. 1990 Dec;172(12):6682–6688. doi: 10.1128/jb.172.12.6682-6688.1990

Isolation of the second Bacillus thuringiensis RNA polymerase that transcribes from a crystal protein gene promoter.

K L Brown 1, H R Whiteley 1
PMCID: PMC210780  PMID: 1701426

Abstract

A crystal protein gene of Bacillus thuringiensis subsp. kurstaki HD-1-Dipel is transcribed in vivo from two overlapping promoters that are activated at different times during sporulation. We reported earlier (K. L. Brown and H. R. Whiteley, Proc. Natl. Acad. Sci. USA 85:4166-4170, 1988) that an RNA polymerase containing a sigma subunit with an apparent Mr of 35,000 can transcribe in vitro from the promoter utilized from early to midsporulation. We now report the isolation of an RNA polymerase containing a sigma subunit with an Mr of ca. 28,000; this polymerase activates transcription in vitro from the promoter used from mid- to late sporulation. This form of RNA polymerase also directs transcription in vitro from promoters preceding two other crystal protein genes and a gene coding for a spore coat protein. On the basis of a comparison of the four promoters, we propose the following consensus sequence for the -10 region recognized by RNA polymerase containing the Mr-28,000 sigma subunit: 5'-TNATANNaTGag-3'. No consensus sequence could be derived for the -35 region. When the N-terminal amino acid sequence of the sigma 28 polypeptide was aligned with the amino acid sequences of known sigma subunits, significant homology was found with the N terminus of the mature form of the sigma K subunit of RNA polymerase isolated from sporulating cells of Bacillus subtilis.

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