National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM103368
米国
Leona M. and Harry B. Helmsley Charitble Trust Grant
#2012-PG-MED002
米国
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)
Intramural Program of the National Institute of Diabetes and Digestive Diseases
米国
引用
ジャーナル: Science / 年: 2017 タイトル: Cryo-EM structures and atomic model of the HIV-1 strand transfer complex intasome. 著者: Dario Oliveira Passos / Min Li / Renbin Yang / Stephanie V Rebensburg / Rodolfo Ghirlando / Youngmin Jeon / Nikoloz Shkriabai / Mamuka Kvaratskhelia / Robert Craigie / Dmitry Lyumkis / 要旨: Like all retroviruses, HIV-1 irreversibly inserts a viral DNA (vDNA) copy of its RNA genome into host target DNA (tDNA). The intasome, a higher-order nucleoprotein complex composed of viral integrase ...Like all retroviruses, HIV-1 irreversibly inserts a viral DNA (vDNA) copy of its RNA genome into host target DNA (tDNA). The intasome, a higher-order nucleoprotein complex composed of viral integrase (IN) and the ends of linear vDNA, mediates integration. Productive integration into host chromatin results in the formation of the strand transfer complex (STC) containing catalytically joined vDNA and tDNA. HIV-1 intasomes have been refractory to high-resolution structural studies. We used a soluble IN fusion protein to facilitate structural studies, through which we present a high-resolution cryo-electron microscopy (cryo-EM) structure of the core tetrameric HIV-1 STC and a higher-order form that adopts carboxyl-terminal domain rearrangements. The distinct STC structures highlight how HIV-1 can use the common retroviral intasome core architecture to accommodate different IN domain modules for assembly.
全体 : complex formed by a tetrameric assembly of Sso7d-fusion HIV-1 Int...
全体
名称: complex formed by a tetrameric assembly of Sso7d-fusion HIV-1 Integrase with the product of DNA strand transfer
要素
複合体: complex formed by a tetrameric assembly of Sso7d-fusion HIV-1 Integrase with the product of DNA strand transfer
タンパク質・ペプチド: HIV-1 Integrase, Sso7d chimera
DNA: DNA (11-MER)
DNA: DNA (23-MER)
DNA: DNA (37-MER)
リガンド: ZINC ION
リガンド: MAGNESIUM ION
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超分子 #1: complex formed by a tetrameric assembly of Sso7d-fusion HIV-1 Int...
超分子
名称: complex formed by a tetrameric assembly of Sso7d-fusion HIV-1 Integrase with the product of DNA strand transfer タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#4
モデルのタイプ: INSILICO MODEL / In silico モデル: common lines model using OptiMod 詳細: An initial model was generated directly from the class averages using OptiMod.
最終 再構成
想定した対称性 - 点群: C2 (2回回転対称) / アルゴリズム: FOURIER SPACE / 解像度のタイプ: BY AUTHOR / 解像度: 3.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: FREALIGN (ver. 9.11) / 詳細: Resolution-limited refinement used throughout / 使用した粒子像数: 83766
タイプ: PROJECTION MATCHING / ソフトウェア - 名称: FREALIGN (ver. 9.11) / 詳細: Frealign 3D classification and refinement
最終 3次元分類
ソフトウェア - 名称: FREALIGN (ver. 3.11)
FSC曲線 (解像度の算出)
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原子モデル構築 1
詳細
To generate ensemble models, the complete intasome model was iteratively relaxed - using two-fold symmetry and a combination of Rosetta and Phenix - against one half map (the working map) and inspected for consistency with the second half map (the free map). The model was then adjusted manually using Coot. Final ensemble modeling used half maps for all aspects of refinement and evaluation: 500 models were generated as described using Rosetta. From the 100 top-scoring models (scored by Rosetta energy), the ten models with the best map-to-model FSC were selected and refined in real space using secondary-structure restraints in Phenix. Molprobity was used throughout the refinement process.
精密化
空間: REAL / プロトコル: FLEXIBLE FIT / 温度因子: 180 / 当てはまり具合の基準: FSC 0.5
得られたモデル
PDB-5u1c: Structure of tetrameric HIV-1 Strand Transfer Complex Intasome