Histone H2B 1.1 / DNA-directed RNA polymerase II subunit RPB1 / General transcription and DNA repair factor IIH helicase subunit XPD/RAD3 / DNA-directed RNA polymerase II subunit RPB2 / TATA-box-binding protein / DNA-directed RNA polymerase II subunit RPB3 / DNA-directed RNA polymerase II subunit RPB4 / DNA-directed RNA polymerases I, II, and III subunit RPABC1 / DNA-directed RNA polymerases I, II, and III subunit RPABC2 / DNA-directed RNA polymerases I, II, and III subunit RPABC3 ...Histone H2B 1.1 / DNA-directed RNA polymerase II subunit RPB1 / General transcription and DNA repair factor IIH helicase subunit XPD/RAD3 / DNA-directed RNA polymerase II subunit RPB2 / TATA-box-binding protein / DNA-directed RNA polymerase II subunit RPB3 / DNA-directed RNA polymerase II subunit RPB4 / DNA-directed RNA polymerases I, II, and III subunit RPABC1 / DNA-directed RNA polymerases I, II, and III subunit RPABC2 / DNA-directed RNA polymerases I, II, and III subunit RPABC3 / DNA-directed RNA polymerases I, II, and III subunit RPABC5 / DNA-directed RNA polymerase II subunit RPB9 / Transcription initiation factor IIB / Transcription initiation factor IIA subunit 2 / General transcription and DNA repair factor IIH subunit TFB1 / DNA-directed RNA polymerase II subunit RPB7 / Transcription initiation factor IIE subunit alpha / Transcription initiation factor IIE subunit beta / DNA-directed RNA polymerase II subunit RPB11 / DNA-directed RNA polymerases I, II, and III subunit RPABC4 / Transcription initiation factor IIF subunit alpha / Transcription initiation factor IIF subunit beta / Histone H4 / Histone H3.2 / General transcription and DNA repair factor IIH helicase/translocase subunit XPB/SSL2 / General transcription and DNA repair factor IIH subunit TFB2 / RNA polymerase II transcription factor B subunit 3 / General transcription and DNA repair factor IIH subunit SSL1 / General transcription and DNA repair factor IIH subunit TFB4 / General transcription and DNA repair factor IIH subunit TFB5 / Histone H2A 類似検索 - 構成要素
ジャーナル: Nat Struct Mol Biol / 年: 2023 タイトル: Structures of transcription preinitiation complex engaged with the +1 nucleosome. 著者: Haibo Wang / Sandra Schilbach / Momchil Ninov / Henning Urlaub / Patrick Cramer / 要旨: The preinitiation complex (PIC) assembles on promoters of protein-coding genes to position RNA polymerase II (Pol II) for transcription initiation. Previous structural studies revealed the PIC on ...The preinitiation complex (PIC) assembles on promoters of protein-coding genes to position RNA polymerase II (Pol II) for transcription initiation. Previous structural studies revealed the PIC on different promoters, but did not address how the PIC assembles within chromatin. In the yeast Saccharomyces cerevisiae, PIC assembly occurs adjacent to the +1 nucleosome that is located downstream of the core promoter. Here we present cryo-EM structures of the yeast PIC bound to promoter DNA and the +1 nucleosome located at three different positions. The general transcription factor TFIIH engages with the incoming downstream nucleosome and its translocase subunit Ssl2 (XPB in human TFIIH) drives the rotation of the +1 nucleosome leading to partial detachment of nucleosomal DNA and intimate interactions between TFIIH and the nucleosome. The structures provide insights into how transcription initiation can be influenced by the +1 nucleosome and may explain why the transcription start site is often located roughly 60 base pairs upstream of the dyad of the +1 nucleosome in yeast.