ジャーナル: Structure / 年: 2006 タイトル: Structure of the bacteriophage phi6 nucleocapsid suggests a mechanism for sequential RNA packaging. 著者: Juha T Huiskonen / Felix de Haas / Doryen Bubeck / Dennis H Bamford / Stephen D Fuller / Sarah J Butcher / 要旨: Bacteriophage phi6 is an enveloped dsRNA virus with a segmented genome. Phi6 specifically packages one copy of each of its three genome segments into a preassembled polymerase complex. This leads to ...Bacteriophage phi6 is an enveloped dsRNA virus with a segmented genome. Phi6 specifically packages one copy of each of its three genome segments into a preassembled polymerase complex. This leads to expansion of the polymerase complex, minus and plus strand RNA synthesis, and assembly of the nucleocapsid. The phi6 in vitro assembly and packaging system is a valuable model for dsRNA virus replication. The structure of the nucleocapsid at 7.5 A resolution presented here reveals the secondary structure of the two major capsid proteins. Asymmetric P1 dimers organize as an inner T = 1 shell, and P8 trimers organize as an outer T = 13 laevo shell. The organization of the P1 molecules in the unexpanded and expanded polymerase complex suggests that the expansion is accomplished by rigid body movements of the P1 monomers. This leads to exposure of new potential RNA binding surfaces to control the sequential packaging of the genome segments.
試料ホルダー: Side entry liquid nitrogen-cooled cryo specimen holder 試料ホルダーモデル: OTHER
実験機器
モデル: Tecnai F20 / 画像提供: FEI Company
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画像解析
CTF補正
詳細: each particle, full CTF correction
最終 再構成
想定した対称性 - 点群: I (正20面体型対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 12.0 Å / 解像度の算出法: FSC 0.5 CUT-OFF / ソフトウェア - 名称: P3DR 詳細: The map was calculated from empty particles lacking the genome 使用した粒子像数: 1163