ジャーナル: FEBS Lett / 年: 2016 タイトル: Nucleotide-dependent conformational changes of the AAA+ ATPase p97 revisited. 著者: Jan M Schuller / Florian Beck / Philip Lössl / Albert J R Heck / Friedrich Förster / 要旨: The ubiquitous AAA-ATPase p97 segregates ubiquitylated proteins from their molecular environment. Previous studies of the nucleotide-dependent conformational changes of p97 were inconclusive. Here, ...The ubiquitous AAA-ATPase p97 segregates ubiquitylated proteins from their molecular environment. Previous studies of the nucleotide-dependent conformational changes of p97 were inconclusive. Here, we determined its structure in the presence of ADP, AMP-PNP, or ATP-γS at 6.1-7.4 Å resolution using single particle cryo-electron microscopy. Both AAA domains, D1 and D2, assemble into essentially six-fold symmetrical rings. The pore of the D1-ring remains essentially closed under all nucleotide conditions, whereas the D2-ring shows an iris-like opening for ADP. The largest conformational changes of p97 are 'swinging motions' of the N-terminal domains, which may enable segregation of ubiquitylated substrates from their environment.
pH: 7.4 / 詳細: Buffer: 40 mM Tris, 150 mM NaCl, 1 mM MgCl2
グリッド
詳細: Lacey Carbon grids
凍結
凍結剤: ETHANE / チャンバー内湿度: 90 % / チャンバー内温度: 120 K / 装置: HOMEMADE PLUNGER / 手法: Blot for 2 seconds before plunging
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
アライメント法
Legacy - 非点収差: Objective lens astigmatism was corrected at 105,000 times magnification
特殊光学系
エネルギーフィルター - 名称: GIF Quantum エネルギーフィルター - エネルギー下限: 0.0 eV エネルギーフィルター - エネルギー上限: 20.0 eV
日付
2014年11月3日
撮影
カテゴリ: CCD フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 実像数: 1728 / 平均電子線量: 40 e/Å2 詳細: Every image is the average of 30 frames recorded by the direct electron detector
The particles were selected using an automatic selection program implemented in the TOM toolbox.
CTF補正
詳細: On the micrograph level
最終 再構成
想定した対称性 - 点群: C6 (6回回転対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 8.1 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: RELION / 詳細: Map was corrected using a B-factor of -576 A^2. / 使用した粒子像数: 40000