National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01-GM63072
米国
引用
ジャーナル: Nature / 年: 2017 タイトル: The cryo-electron microscopy structure of human transcription factor IIH. 著者: Basil J Greber / Thi Hoang Duong Nguyen / Jie Fang / Pavel V Afonine / Paul D Adams / Eva Nogales / 要旨: Human transcription factor IIH (TFIIH) is part of the general transcriptional machinery required by RNA polymerase II for the initiation of eukaryotic gene transcription. Composed of ten subunits ...Human transcription factor IIH (TFIIH) is part of the general transcriptional machinery required by RNA polymerase II for the initiation of eukaryotic gene transcription. Composed of ten subunits that add up to a molecular mass of about 500 kDa, TFIIH is also essential for nucleotide excision repair. The seven-subunit TFIIH core complex formed by XPB, XPD, p62, p52, p44, p34, and p8 is competent for DNA repair, while the CDK-activating kinase subcomplex, which includes the kinase activity of CDK7 as well as the cyclin H and MAT1 subunits, is additionally required for transcription initiation. Mutations in the TFIIH subunits XPB, XPD, and p8 lead to severe premature ageing and cancer propensity in the genetic diseases xeroderma pigmentosum, Cockayne syndrome, and trichothiodystrophy, highlighting the importance of TFIIH for cellular physiology. Here we present the cryo-electron microscopy structure of human TFIIH at 4.4 Å resolution. The structure reveals the molecular architecture of the TFIIH core complex, the detailed structures of its constituent XPB and XPD ATPases, and how the core and kinase subcomplexes of TFIIH are connected. Additionally, our structure provides insight into the conformational dynamics of TFIIH and the regulation of its activity.
詳細: Box and pixel size were adjusted before initial refinement.
最終 再構成
使用したクラス数: 1 / 想定した対称性 - 点群: C1 (非対称) / アルゴリズム: FOURIER SPACE / 解像度のタイプ: BY AUTHOR / 解像度: 5.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: RELION (ver. 1.4) 詳細: RELION 3D auto-refinement (gold standard). The final 3D classification used signal-subtracted particle images. The final reconstruction used the corresponding un-subtracted particle images. 使用した粒子像数: 35900
初期 角度割当
タイプ: PROJECTION MATCHING / ソフトウェア - 名称: RELION (ver. 1.4) / 詳細: Maximum-likelihood 3D classification within RELION.
最終 角度割当
タイプ: PROJECTION MATCHING / ソフトウェア - 名称: RELION (ver. 1.4) / 詳細: Maximum-likelihood 3D refinement within RELION.
最終 3次元分類
クラス数: 6 / ソフトウェア - 名称: RELION (ver. 1.4) 詳細: Signal-subtracted classification in RELION 1.4, using 6 classes.
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原子モデル構築 1
詳細
Fitting of a refined coordinate model obtained from a 4.4 Angstrom reconstruction of TFIIH from the same initial dataset (PDB ID 5OF4).