DNA-directed RNA polymerase II subunit RPB1 / Transcription elongation factor S-II / DNA-directed RNA polymerase II subunit RPB2 / DNA-directed RNA polymerase II subunit RPB3 / Mediator of RNA polymerase II transcription subunit 14 / 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 RPB1 / Transcription elongation factor S-II / DNA-directed RNA polymerase II subunit RPB2 / DNA-directed RNA polymerase II subunit RPB3 / Mediator of RNA polymerase II transcription subunit 14 / 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 / Mediator of RNA polymerase II transcription subunit 19 / DNA-directed RNA polymerase II subunit RPB9 / Transcription initiation factor IIB / Mediator of RNA polymerase II transcription subunit 17 / Mediator of RNA polymerase II transcription subunit 22 / Mediator of RNA polymerase II transcription subunit 18 / Mediator of RNA polymerase II transcription subunit 9 / DNA-directed RNA polymerase II subunit RPB7 / Mediator of RNA polymerase II transcription subunit 20 / Mediator of RNA polymerase II transcription subunit 8 / Mediator of RNA polymerase II transcription subunit 31 / Mediator of RNA polymerase II transcription subunit 6 / 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 / Mediator of RNA polymerase II transcription subunit 21 / Mediator of RNA polymerase II transcription subunit 10 / Mediator of RNA polymerase II transcription subunit 7 / Mediator of RNA polymerase II transcription subunit 1 / Mediator of RNA polymerase II transcription subunit 4 / Mediator of RNA polymerase II transcription subunit 11 Similarity search - Component
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01-GM123233-01
United States
Citation
Journal: Mol Cell / Year: 2023 Title: Structural basis of a transcription pre-initiation complex on a divergent promoter. Authors: Jose J Gorbea Colón / Leon Palao / Shin-Fu Chen / Hee Jong Kim / Laura Snyder / Yi-Wei Chang / Kuang-Lei Tsai / Kenji Murakami / Abstract: Most eukaryotic promoter regions are divergently transcribed. As the RNA polymerase II pre-initiation complex (PIC) is intrinsically asymmetric and responsible for transcription in a single ...Most eukaryotic promoter regions are divergently transcribed. As the RNA polymerase II pre-initiation complex (PIC) is intrinsically asymmetric and responsible for transcription in a single direction, it is unknown how divergent transcription arises. Here, the Saccharomyces cerevisiae Mediator complexed with a PIC (Med-PIC) was assembled on a divergent promoter and analyzed by cryoelectron microscopy. The structure reveals two distinct Med-PICs forming a dimer through the Mediator tail module, induced by a homodimeric activator protein localized near the dimerization interface. The tail dimer is associated with ∼80-bp upstream DNA, such that two flanking core promoter regions are positioned and oriented in a suitable form for PIC assembly in opposite directions. Also, cryoelectron tomography visualized the progress of the PIC assembly on the two core promoter regions, providing direct evidence for the role of the Med-PIC dimer in divergent transcription.
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