ppGpp regulates the binding of two RNA polymerase molecules to the tyrT promoter

Andrew A. Travers, Angus I. Lamond, Hilary A.F. Mace

Research output: Contribution to journalArticle

13 Citations (Scopus)


Bacterial promoters differ in the number of RNA polymerase molecules that bind to form a filterable polymerase-promoter complex. We show that two holoenzyme molecules interact with the tyrT promoter, probably as a dimer. This interaction is inhibited by ppGpp. By contrast a single holoenzyme monomer suffices for complex formation at the lacUV5 promoter. We propose that In vivo promoter selection by monomeric and dimeric forms of the enzyme could coordinate the synthesis of stable RNA with that of mRNA and could also account in part for the switch in transcriptiona selectivity during the stringent response.

Original languageEnglish
Pages (from-to)5043-5057
Number of pages15
JournalNucleic Acids Research
Issue number16
Publication statusPublished - 25 Aug 1982


Cite this