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Two catabolite activator protein molecules bind to the galactose promoter region of Escherichia coli in the presence of RNA polymerase 总被引:13,自引:2,他引:13
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Stephanie H. Shanblatt Arnold Revzin 《Proceedings of the National Academy of Sciences of the United States of America》1983,80(6):1594-1598
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Heterogeneity of RNA polymerase in Bacillus subtilis: evidence for an additional sigma factor in vegetative cells. 总被引:20,自引:10,他引:20
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J L Wiggs M Z Gilman M J Chamberlin 《Proceedings of the National Academy of Sciences of the United States of America》1981,78(5):2762-2766
Preparations of Bacillus subtilis RNA polymerase (nucleosidetriphosphate:RNA nucleotidyltransferase, EC 2.7.7.6) from vegetatively growing cells contain small amounts of an activity (B. subtilis RNA polymerase holoenzyme II) that shows a unique promoter specificity with T7 bacteriophage DNA as compared with the normal B. subtilis holoenzyme (holoenzyme I) and lacks the normal sigma subunit [Jaehning, J. A., Wiggs, J. L. & Chamberlin, M. J. (1979) Proc. Natl. Acad. Sci. USA 76, 5470-5474]. By heparin-agarose chromatography we have obtained holoenzyme II fractions that have no detectable holoenzyme I activity as judged by their failure to utilize promoter sites for holoenzyme I on any template we have tested. These fractions are far more active with B. subtilis DNA than with T7 DNA or other heterologous templates. This high degree of specificity has allowed identification of plasmids containing cloned fragments of B. subtilis DNA that bear strong promoter sites for holoenzyme II. These promoter sites are not used at all by B. subtilis RNA polymerase holoenzyme I. The specificity of holoenzyme II is dictated by a peptide of Mr 28,000 as judged by copurification of the peptide with specific holoenzyme II activity and by reconstitution of the holoenzyme II promoter specificity when the isolated peptide is added to B. subtilis core polymerase. Hence the 28,000 Mr peptide appears to be a sigma factor that determines a promoter specificity distinct from that of RNA polymerase holoenzyme I and all other known bacterial RNA polymerases. 相似文献
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Promoter architecture in the flagellar regulon of Bacillus subtilis: high-level expression of flagellin by the sigma D RNA polymerase requires an upstream promoter element. 总被引:5,自引:1,他引:5
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K Fredrick T Caramori Y F Chen A Galizzi J D Helmann 《Proceedings of the National Academy of Sciences of the United States of America》1995,92(7):2582-2586