Mediator of RNA polymerase II transcription subunit 11 / Transcription initiation factor IIA subunit 2 / TFB1 isoform 1 / Mediator of RNA polymerase II transcription subunit 8 / Mediator of RNA polymerase II transcription subunit 4 / TOA1 isoform 1 / RNA polymerase II transcription factor B subunit 2 / Mediator of RNA polymerase II transcription subunit 19 / Mediator of RNA polymerase II transcription subunit 21 / Mediator of RNA polymerase II transcription subunit 10 ...Mediator of RNA polymerase II transcription subunit 11 / Transcription initiation factor IIA subunit 2 / TFB1 isoform 1 / Mediator of RNA polymerase II transcription subunit 8 / Mediator of RNA polymerase II transcription subunit 4 / TOA1 isoform 1 / RNA polymerase II transcription factor B subunit 2 / Mediator of RNA polymerase II transcription subunit 19 / Mediator of RNA polymerase II transcription subunit 21 / Mediator of RNA polymerase II transcription subunit 10 / Mediator of RNA polymerase II transcription subunit 9 / General transcription and DNA repair factor IIH / Mediator of RNA polymerase II transcription subunit 7 / RNA polymerase II transcription factor B subunit 3 / Mediator of RNA polymerase II transcription subunit 1 / General transcription and DNA repair factor IIH subunit TFB4 / Mediator of RNA polymerase II transcription subunit 18 / Mediator of RNA polymerase II transcription subunit 6 / Mediator of RNA polymerase II transcription subunit 31 / Transcription initiation factor IIF subunit alpha / Mediator of RNA polymerase II transcription subunit 14 / Mediator of RNA polymerase II transcription subunit 17 / General transcription and DNA repair factor IIH subunit TFB5 / TATA-binding protein / 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 / 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 / Mediator of RNA polymerase II transcription subunit 22 / DNA-directed RNA polymerase II subunit RPB7 / Mediator of RNA polymerase II transcription subunit 20 / 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 beta / Histone H4 / Histone H3.2 / General transcription and DNA repair factor IIH helicase/translocase subunit XPB/SSL2 / Histone H2A Similarity search - Component
Journal: Proc Natl Acad Sci U S A / Year: 2023 Title: Yeast PIC-Mediator structure with RNA polymerase II C-terminal domain. Authors: Sandra Schilbach / Haibo Wang / Christian Dienemann / Patrick Cramer / Abstract: For transcription initiation, RNA polymerase II (Pol II) forms a preinitiation complex (PIC) that associates with the general coactivator Mediator. Whereas atomic models of the human PIC-Mediator ...For transcription initiation, RNA polymerase II (Pol II) forms a preinitiation complex (PIC) that associates with the general coactivator Mediator. Whereas atomic models of the human PIC-Mediator structure have been reported, structures for its yeast counterpart remain incomplete. Here, we present an atomic model for the yeast PIC with core Mediator, including the Mediator middle module that was previously poorly resolved and including subunit Med1 that was previously lacking. We observe three peptide regions containing eleven of the 26 heptapeptide repeats of the flexible C-terminal repeat domain (CTD) of Pol II. Two of these CTD regions bind between the Mediator head and middle modules and form defined CTD-Mediator interactions. CTD peptide 1 binds between the Med6 shoulder and Med31 knob domains, whereas CTD peptide 2 forms additional contacts with Med4. The third CTD region (peptide 3) binds in the Mediator cradle and associates with the Mediator hook. Comparisons with the human PIC-Mediator structure show that the central region in peptide 1 is similar and forms conserved contacts with Mediator, whereas peptides 2 and 3 exhibit distinct structures and Mediator interactions.
Macromolecule #1: General transcription and DNA repair factor IIH helicase subunit XPD
Macromolecule
Name: General transcription and DNA repair factor IIH helicase subunit XPD type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA helicase
UniProtKB: General transcription and DNA repair factor IIH
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Macromolecule #8: General transcription and DNA repair factor IIH helicase subunit XPB
Macromolecule
Name: General transcription and DNA repair factor IIH helicase subunit XPB type: protein_or_peptide / ID: 8 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA helicase
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