Structural modules of RNA polymerase required for transcription from promoters containing downstream basal promoter element GGGA

Nataliya Barinova, Konstantin Kuznedelov, Konstantin Severinov, Andrey Kulbachinskiy

Результат исследований: Вклад в журналСтатьярецензирование

14 Цитирования (Scopus)

Аннотация

We recently described a novel basal bacterial promoter element that is located downstream of the -10 consensus promoter element and is recognized by region 1.2 of the σ subunit of RNA polymerase (RNAP). In the case of Thermus aquaticus RNAP, this element has a consensus sequence GGGA and allows transcription initiation in the absence of the -35 element. In contrast, the Escherichia coli RNAP is unable to initiate transcription from GGGA-containing promoters that lack the -35 element. In the present study, we demonstrate that σ subunits from both E. coli and T. aquaticus specifically recognize the GGGA element and that the observed species specificity of recognition of GGGA-containing promoters is determined by the RNAP core enzyme. We further demonstrate that transcription initiation by T. aquaticus RNAP on GGGA-containing promoters in the absence of the -35 element requires σ region 4 and C-terminal domains of the α subunits, which interact with upstream promoter DNA. When in the context of promoters containing the -35 element, the GGGA element is recognized by holoenzyme RNAPs from both E. coli and T. aquaticus and increases stability of promoter complexes formed on these promoters. Thus, GGGA is a bona fide basal promoter element that can function in various bacteria and, depending on the properties of the RNAP core enzyme and the presence of additional promoter elements, determine species-specific differences in promoter recognition.

Язык оригиналаАнглийский
Страницы (с-по)22482-22489
Число страниц8
ЖурналJournal of Biological Chemistry
Том283
Номер выпуска33
DOI
СостояниеОпубликовано - 15 авг. 2008
Опубликовано для внешнего пользованияДа

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