ジャーナル: J Virol / 年: 2007 タイトル: Structure of immature West Nile virus. 著者: Ying Zhang / Bärbel Kaufmann / Paul R Chipman / Richard J Kuhn / Michael G Rossmann / 要旨: The structure of immature West Nile virus particles, propagated in the presence of ammonium chloride to block virus maturation in the low-pH environment of the trans-Golgi network, was determined by ...The structure of immature West Nile virus particles, propagated in the presence of ammonium chloride to block virus maturation in the low-pH environment of the trans-Golgi network, was determined by cryo-electron microscopy (cryo-EM). The structure of these particles was similar to that of immature West Nile virus particles found as a minor component of mature virus samples (naturally occurring immature particles [NOIPs]). The structures of mature infectious flaviviruses are radically different from those of the immature particles. The similarity of the ammonium chloride-treated particles and NOIPs suggests either that the NOIPs have not undergone any conformational change during maturation or that the conformational change is reversible. Comparison with the cryo-EM reconstruction of immature dengue virus established the locations of the N-linked glycosylation sites of these viruses, verifying the interpretation of the reconstructions of the immature flaviviruses.
モード: BRIGHT FIELD / 倍率(公称値): 45000 X / 倍率(補正後): 47400 X / 最大 デフォーカス(公称値): 3100 nm / 最小 デフォーカス(公称値): 1300 nm / Cs: 2 mm
試料ホルダ
温度: 87 K / 傾斜角・最大: 0 ° / 傾斜角・最小: 0 °
撮影
電子線照射量: 22 e/Å2 / フィルム・検出器のモデル: KODAK SO-163 FILM
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解析
EMソフトウェア
ID
名称
カテゴリ
詳細
1
EMfit
モデルフィッティング
2
EM3DR
3次元再構成
3
PFT
3次元再構成
PFTSEARCH
4
POR
3次元再構成
CTF補正
詳細: CTF correction of each particle
対称性
点対称性: I (正20面体型対称)
3次元再構成
手法: PFT / 解像度: 24 Å / 粒子像の数: 341 / ピクセルサイズ(実測値): 2.95 Å / 対称性のタイプ: POINT
原子モデル構築
プロトコル: RIGID BODY FIT / 空間: REAL Target criteria: best fit using criterial described in paper by Rossmann et al., Journal of structural biology 136, 190-200 (2001) 詳細: METHOD--Three E molecules were fitted consecutively REFINEMENT PROTOCOL--rigid body