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-Structure paper
タイトル | Structural basis of a transcription pre-initiation complex on a divergent promoter. |
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ジャーナル・号・ページ | Mol Cell, Vol. 83, Issue 4, Page 574-588.e11, Year 2023 |
掲載日 | 2023年2月16日 |
著者 | Jose J Gorbea Colón / Leon Palao / Shin-Fu Chen / Hee Jong Kim / Laura Snyder / Yi-Wei Chang / Kuang-Lei Tsai / Kenji Murakami / |
PubMed 要旨 | 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. |
リンク | Mol Cell / PubMed:36731470 / PubMed Central |
手法 | EM (単粒子) / EM (サブトモグラム平均) |
解像度 | 3.3 - 36.0 Å |
構造データ | EMDB-26542, PDB-7ui9: EMDB-26543, PDB-7uic: EMDB-26544, PDB-7uif: EMDB-26545, PDB-7uig: EMDB-26547, PDB-7uik: EMDB-26548, PDB-7uil: EMDB-26551, PDB-7uio: EMDB-28023: Dimerized Mediator-PIC with early GTFs and TFIIE on a divergent promoter EMDB-28024: Dimerized Mediator PIC with early GTFs on a divergent promoter |
化合物 | ChemComp-ZN: ChemComp-THR: ChemComp-ALA: ChemComp-ASP: |
由来 |
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キーワード | TRANSCRIPTION / Divergent transcription / Mediator / RNA Polymerase II / PIC / Pre-Initiation / Activation / Transcription Factor / Gal4 / Gal4VP16 |