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. 1985 Dec;82(24):8453–8457. doi: 10.1073/pnas.82.24.8453

Transcription of glnA by purified Escherichia coli components: core RNA polymerase and the products of glnF, glnG, and glnL.

T P Hunt, B Magasanik
PMCID: PMC390934  PMID: 2867543

Abstract

We have shown that the purified glnF (ntrA) product of Escherichia coli binds to core RNA polymerase. Together these proteins initiated transcription at the nitrogen-regulated promoter glnAp2 on a supercoiled template. The initiation of transcription at glnAp2 on a linear template required in addition NRI, the product of glnG (ntrC), and NRII2302, the product of a mutant allele of glnL (ntrB). These results identify the glnF product as a new sigma factor specifically required for the transcription of nitrogen-regulated and of nitrogen-fixation promoters. We propose rpoN as the proper designation for glnF, and sigma 60 for its product. Our results indicate that sigma 60 RNA polymerase recognizes the nitrogen-regulated/nitrogen-fixation promoter consensus sequence C-T-G-G-Y-A-Y-R-N4-T-T-G-C-A. Initiation of transcription in the intact cell appears to require in addition the active form of NRI, the product of glnG. Conversion of NRI to its active form is apparently brought about by NRII, the product of glnL, in response to nitrogen deprivation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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