ジャーナル: Proc Natl Acad Sci U S A / 年: 2023 タイトル: Structure and supramolecular organization of the canine distemper virus attachment glycoprotein. 著者: David Kalbermatter / Jean-Marc Jeckelmann / Marianne Wyss / Neeta Shrestha / Dimanthi Pliatsika / Rainer Riedl / Thomas Lemmin / Philippe Plattet / Dimitrios Fotiadis / 要旨: Canine distemper virus (CDV) is an enveloped RNA morbillivirus that triggers respiratory, enteric, and high incidence of severe neurological disorders. CDV induces devastating outbreaks in wild and ...Canine distemper virus (CDV) is an enveloped RNA morbillivirus that triggers respiratory, enteric, and high incidence of severe neurological disorders. CDV induces devastating outbreaks in wild and endangered animals as well as in domestic dogs in countries associated with suboptimal vaccination programs. The receptor-binding tetrameric attachment (H)-protein is part of the morbilliviral cell entry machinery. Here, we present the cryo-electron microscopy (cryo-EM) structure and supramolecular organization of the tetrameric CDV H-protein ectodomain. The structure reveals that the morbilliviral H-protein is composed of three main domains: stalk, neck, and heads. The most unexpected feature was the inherent asymmetric architecture of the CDV H-tetramer being shaped by the neck, which folds into an almost 90° bent conformation with respect to the stalk. Consequently, two non-contacting receptor-binding H-head dimers, which are also tilted toward each other, are located on one side of an intertwined four helical bundle stalk domain. Positioning of the four protomer polypeptide chains within the neck domain is guided by a glycine residue (G158), which forms a hinge point exclusively in two protomer polypeptide chains. Molecular dynamics simulations validated the stability of the asymmetric structure under near physiological conditions and molecular docking showed that two receptor-binding sites are fully accessible. Thus, this spatial organization of the CDV H-tetramer would allow for concomitant protein interactions with the stalk and head domains without steric clashes. In summary, the structure of the CDV H-protein ectodomain provides new insights into the morbilliviral cell entry system and offers a blueprint for next-generation structure-based antiviral drug discovery.
平均露光時間: 1.5 sec. / 電子線照射量: 50 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 撮影したグリッド数: 2 / 実像数: 26835 詳細: Two Datasets from two different grids were recorded: 13,760 and 13,075 movies
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解析
ソフトウェア
名称: PHENIX / バージョン: 1.20_4459: / 分類: 精密化
EMソフトウェア
ID
名称
バージョン
カテゴリ
1
RELION
3.1.1
粒子像選択
2
SerialEM
画像取得
4
CTFFIND
4.1.14
CTF補正
7
UCSF Chimera
1.14
モデルフィッティング
9
RELION
3.1.1
初期オイラー角割当
10
cryoSPARC
3.2.0
最終オイラー角割当
11
cryoSPARC
3.2.0
分類
12
cryoSPARC
3.2.0
3次元再構成
13
PHENIX
1.20_4459
モデル精密化
CTF補正
タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION
粒子像の選択
選択した粒子像数: 6471114
対称性
点対称性: C1 (非対称)
3次元再構成
解像度: 3.26 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 663258 / 対称性のタイプ: POINT