ジャーナル: Nat Commun / 年: 2021 タイトル: Structural basis of RNA polymerase inhibition by viral and host factors. 著者: Simona Pilotto / Thomas Fouqueau / Natalya Lukoyanova / Carol Sheppard / Soizick Lucas-Staat / Luis Miguel Díaz-Santín / Dorota Matelska / David Prangishvili / Alan C M Cheung / Finn Werner / 要旨: RNA polymerase inhibition plays an important role in the regulation of transcription in response to environmental changes and in the virus-host relationship. Here we present the high-resolution ...RNA polymerase inhibition plays an important role in the regulation of transcription in response to environmental changes and in the virus-host relationship. Here we present the high-resolution structures of two such RNAP-inhibitor complexes that provide the structural bases underlying RNAP inhibition in archaea. The Acidianus two-tailed virus encodes the RIP factor that binds inside the DNA-binding channel of RNAP, inhibiting transcription by occlusion of binding sites for nucleic acid and the transcription initiation factor TFB. Infection with the Sulfolobus Turreted Icosahedral Virus induces the expression of the host factor TFS4, which binds in the RNAP funnel similarly to eukaryotic transcript cleavage factors. However, TFS4 allosterically induces a widening of the DNA-binding channel which disrupts trigger loop and bridge helix motifs. Importantly, the conformational changes induced by TFS4 are closely related to inactivated states of RNAP in other domains of life indicating a deep evolutionary conservation of allosteric RNAP inhibition.
超分子 #1: Complex of archaeal RNA-polymerase with the ATV inhibitory protein RIP
超分子
名称: Complex of archaeal RNA-polymerase with the ATV inhibitory protein RIP タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#14 詳細: The RNA polymerase was incubated with a 10-fold excess of RIP for 5 min at 338 K followed by cross-linking with BS3
名称: RNAP inhibitory protein / タイプ: protein_or_peptide / ID: 14 詳細: Residual sequence from the thrombin cleavage site at the C-terminus of RIP (LVPR) コピー数: 1 / 光学異性体: LEVO
クラス数: 2 / 平均メンバー数/クラス: 75000 / ソフトウェア - 名称: cryoSPARC (ver. 2.0) / ソフトウェア - 詳細: 3D reconstruction 詳細: The classification provided two classes of identical maps, splitting the particles equally in the two classes. For that, the particles of both classes have been pooled together for the final reconstruction
最終 角度割当
タイプ: NOT APPLICABLE / ソフトウェア - 名称: cryoSPARC (ver. 2.0) / ソフトウェア - 詳細: 3D reconstruction
最終 再構成
使用したクラス数: 2 / 想定した対称性 - 点群: C1 (非対称) / 解像度のタイプ: BY AUTHOR / 解像度: 3.27 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: RELION (ver. 3.0) ソフトウェア - 詳細: 3D refinement, followed by three cycles of CTF refinement and post processing 使用した粒子像数: 151237
詳細
The movie-stacks were aligned and summed using MotionCor2 within Relion 3.0