ジャーナル: Nat Commun / 年: 2016 タイトル: The FANCD2-FANCI complex is recruited to DNA interstrand crosslinks before monoubiquitination of FANCD2. 著者: Chih-Chao Liang / Zhuolun Li / David Lopez-Martinez / William V Nicholson / Catherine Vénien-Bryan / Martin A Cohn / 要旨: The Fanconi anaemia (FA) pathway is important for the repair of DNA interstrand crosslinks (ICL). The FANCD2-FANCI complex is central to the pathway, and localizes to ICLs dependent on its ...The Fanconi anaemia (FA) pathway is important for the repair of DNA interstrand crosslinks (ICL). The FANCD2-FANCI complex is central to the pathway, and localizes to ICLs dependent on its monoubiquitination. It has remained elusive whether the complex is recruited before or after the critical monoubiquitination. Here, we report the first structural insight into the human FANCD2-FANCI complex by obtaining the cryo-EM structure. The complex contains an inner cavity, large enough to accommodate a double-stranded DNA helix, as well as a protruding Tower domain. Disease-causing mutations in the Tower domain are observed in several FA patients. Our work reveals that recruitment of the complex to a stalled replication fork serves as the trigger for the activating monoubiquitination event. Taken together, our results uncover the mechanism of how the FANCD2-FANCI complex activates the FA pathway, and explains the underlying molecular defect in FA patients with mutations in the Tower domain.
名称: human FANCD2/FANCI complex / タイプ: complex / ID: 1 / 親要素: 0 詳細: FANCD2 is expressed using the pFastBac1 vector (Life Technologies) with an engineered N-terminal Flag-HA tag, and FANCI is expressed using the pFastBac1 vector (Life Technologies) with an ...詳細: FANCD2 is expressed using the pFastBac1 vector (Life Technologies) with an engineered N-terminal Flag-HA tag, and FANCI is expressed using the pFastBac1 vector (Life Technologies) with an engineered N-terminal Flag-MBP tag or a N-terminal Flag-HA tag
由来(天然)
生物種: Helenium autumnale (ダンゴギク)
組換発現
生物種: Homo sapiens (ヒト) / 組換細胞: hela / 組換プラスミド: pX459
照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 2.0 mm / 最小 デフォーカス(公称値): 3.0 µm / 倍率(公称値): 40000
試料ステージ
試料ホルダーモデル: GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER ホルダー冷却材: NITROGEN
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画像解析
粒子像選択
選択した数: 13222
CTF補正
ソフトウェア - 名称: CTFFIND (ver. 3)
初期モデル
モデルのタイプ: RANDOM CONICAL TILT / Random conical tilt - Number images: 8164 / Random conical tilt - Tilt angle: 50 degrees 詳細: No initial model was existing, an initial model was calculated using the random conical tilt method implemented by SPIDER using 8164 particles negatively stained
最終 再構成
解像度のタイプ: BY AUTHOR / 解像度: 22.0 Å / 解像度の算出法: FSC 0.5 CUT-OFF / ソフトウェア - 名称: RELION / 使用した粒子像数: 5058