Formation of an Additional Promoter in the Regulatory Region of the Escherichia coli udp Gene and Its Structural and Functional Characterization

Formation of an Additional Promoter in the Regulatory Region of the Escherichia coli udp Gene and... Structural and functional organization of the mutant udpP18 promoter generated after the spontaneous deletion of the G base in the –79 position relative to the start site of transcription from the main (P1) promoter within the regulatory region of the udp gene was studied. In this mutant, a new, functionally active promoter (P2) with the start site of transcription in the –64 position that contained the typical motif 5"-TG-3" located in front of the Pribnow sequence was formed. The data presented suggest that the expression of the P2 promoter, unlike that of P1, is not subjected to regulation with participation of the CytR protein and the cAMP–CRP complex. Results of mutational analysis of the P2 promoter showed that substitutions of the nucleotide G in the –14 position and nucleotide T in the –15 position significantly diminish the level of transcription from the P2 promoter. On the basis of these data, it is concluded that the P2 promoter could be assigned with respect to its characteristics to a group of promoters with an extended –10 region. The synergistic effect of P1 and P2 promoters on total expression of the udp gene in the mutant udpP18 was detected. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Formation of an Additional Promoter in the Regulatory Region of the Escherichia coli udp Gene and Its Structural and Functional Characterization

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Biomedicine; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1023/A:1015582912479
Publisher site
See Article on Publisher Site

Abstract

Structural and functional organization of the mutant udpP18 promoter generated after the spontaneous deletion of the G base in the –79 position relative to the start site of transcription from the main (P1) promoter within the regulatory region of the udp gene was studied. In this mutant, a new, functionally active promoter (P2) with the start site of transcription in the –64 position that contained the typical motif 5"-TG-3" located in front of the Pribnow sequence was formed. The data presented suggest that the expression of the P2 promoter, unlike that of P1, is not subjected to regulation with participation of the CytR protein and the cAMP–CRP complex. Results of mutational analysis of the P2 promoter showed that substitutions of the nucleotide G in the –14 position and nucleotide T in the –15 position significantly diminish the level of transcription from the P2 promoter. On the basis of these data, it is concluded that the P2 promoter could be assigned with respect to its characteristics to a group of promoters with an extended –10 region. The synergistic effect of P1 and P2 promoters on total expression of the udp gene in the mutant udpP18 was detected.

Journal

Russian Journal of GeneticsSpringer Journals

Published: Oct 13, 2004

References

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