ジャーナル: EMBO J / 年: 2011 タイトル: Atomic model of an infectious rotavirus particle. 著者: Ethan C Settembre / James Z Chen / Philip R Dormitzer / Nikolaus Grigorieff / Stephen C Harrison / 要旨: Non-enveloped viruses of different types have evolved distinct mechanisms for penetrating a cellular membrane during infection. Rotavirus penetration appears to occur by a process resembling ...Non-enveloped viruses of different types have evolved distinct mechanisms for penetrating a cellular membrane during infection. Rotavirus penetration appears to occur by a process resembling enveloped-virus fusion: membrane distortion linked to conformational changes in a viral protein. Evidence for such a mechanism comes from crystallographic analyses of fragments of VP4, the rotavirus-penetration protein, and infectivity analyses of structure-based VP4 mutants. We describe here the structure of an infectious rotavirus particle determined by electron cryomicroscopy (cryoEM) and single-particle analysis at about 4.3 Å resolution. The cryoEM image reconstruction permits a nearly complete trace of the VP4 polypeptide chain, including the positions of most side chains. It shows how the two subfragments of VP4 (VP8(*) and VP5(*)) retain their association after proteolytic cleavage, reveals multiple structural roles for the β-barrel domain of VP5(*), and specifies interactions of VP4 with other capsid proteins. The virion model allows us to integrate structural and functional information into a coherent mechanism for rotavirus entry.
The particles were selected from the best class averages with high VP4 occupancy
CTF補正
詳細: Each particle
最終 再構成
想定した対称性 - 点群: C1 (非対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 7.7 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: Relion 詳細: Final map was postprocessed in Relion. Inverse B-factor of 487 was applied. 使用した粒子像数: 112049