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Promoter switching during development and the termination site of the σ43 operon of Bacillus subtilis

✍ Scribed by Wang, Lin-Fa ;Doi, Roy H.

Book ID
104725740
Publisher
Springer
Year
1987
Tongue
English
Weight
628 KB
Volume
207
Category
Article
ISSN
0026-8925

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✦ Synopsis

Sequencing data indicated that the RNA polymerase sigma 43 operon of Bacillus subtilis consisted of three genes, P23 (function unknown), dnaE (DNA primase), and rpoD (sigma 43) (Wang and Doi 1986a). S1 nuclease mapping experiments with RNA from various stages of growth demonstrated the presence of two overlapping sigma 43 promoters that controlled the expression of the operon during growth and a sigma 37 promoter that regulated the expression of the operon during the sporulation phase. This promoter switching mechanism ensured that this important operon would be expressed during different nutritional states of the cell and also illustrated a function for the minor RNA polymerase sigma 37 holoenzyme in the expression of genes which are normally expressed during the logarithmic phase of growth. The location of the transcription termination signal confirmed that the sigma 43 operon consists of three genes.

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