ジャーナル: Biomedicines / 年: 2021 タイトル: Structural and Computational Study of the GroEL-Prion Protein Complex. 著者: Aleksandra A Mamchur / Andrei V Moiseenko / Irina S Panina / Igor A Yaroshevich / Sofia S Kudryavtseva / Evgeny B Pichkur / Olga S Sokolova / Vladimir I Muronetz / Tatiana B Stanishneva-Konovalova / 要旨: The molecular chaperone GroEL is designed to promote protein folding and prevent aggregation. However, the interaction between GroEL and the prion protein, PrP, could lead to pathogenic ...The molecular chaperone GroEL is designed to promote protein folding and prevent aggregation. However, the interaction between GroEL and the prion protein, PrP, could lead to pathogenic transformation of the latter to the aggregation-prone PrP form. Here, the molecular basis of the interactions in the GroEL-PrP complex is studied with cryo-EM and molecular dynamics approaches. The obtained cryo-EM structure shows PrP to be bound to several subunits of GroEL at the level of their apical domains. According to MD simulations, the disordered N-domain of PrP forms much more intermolecular contacts with GroEL. Upon binding to the GroEL, the N-domain of PrP begins to form short helices, while the C-domain of PrP exhibits a tendency to unfold its α2-helix. In the absence of the nucleotides in the system, these processes are manifested at the hundred nanoseconds to microsecond timescale.
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277.5 K / 装置: FEI VITROBOT MARK IV
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: FEI FALCON II (4k x 4k) 実像数: 1621 / 平均電子線量: 100.0 e/Å2
電子線
加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN
電子光学系
照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 0.05 mm
試料ステージ
試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER
実験機器
モデル: Titan Krios / 画像提供: FEI Company
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画像解析
粒子像選択
選択した数: 154000
CTF補正
ソフトウェア - 名称: CTFFIND
初期モデル
モデルのタイプ: NONE / 詳細: Initial model generated in Relion with SGD
最終 再構成
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: 4.0 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: RELION (ver. 3.0.8) 詳細: Final reconstruction was performed on C2-symmetry expanded dataset with the mask encapsulating one of the GroEL rings along with the PrP volume. The other ring density was subjected to particle subtraction. 使用した粒子像数: 82300
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: RELION (ver. 3.0.8)
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: RELION (ver. 3.0.8)
最終 3次元分類
クラス数: 6 / ソフトウェア - 名称: RELION (ver. 3.0.8) 詳細: The classification performed on C2-symmetry expanded dataset with the mask encapsulating one of the GroEL rings along with the PrP volume. The other ring density was subjected to particle subtraction.