ジャーナル: PLoS Pathog / 年: 2013 タイトル: The enterovirus 71 A-particle forms a gateway to allow genome release: a cryoEM study of picornavirus uncoating. 著者: Kristin L Shingler / Jennifer L Yoder / Michael S Carnegie / Robert E Ashley / Alexander M Makhov / James F Conway / Susan Hafenstein / 要旨: Since its discovery in 1969, enterovirus 71 (EV71) has emerged as a serious worldwide health threat. This human pathogen of the picornavirus family causes hand, foot, and mouth disease, and also has ...Since its discovery in 1969, enterovirus 71 (EV71) has emerged as a serious worldwide health threat. This human pathogen of the picornavirus family causes hand, foot, and mouth disease, and also has the capacity to invade the central nervous system to cause severe disease and death. Upon binding to a host receptor on the cell surface, the virus begins a two-step uncoating process, first forming an expanded, altered "A-particle", which is primed for genome release. In a second step after endocytosis, an unknown trigger leads to RNA expulsion, generating an intact, empty capsid. Cryo-electron microscopy reconstructions of these two capsid states provide insight into the mechanics of genome release. The EV71 A-particle capsid interacts with the genome near the icosahedral two-fold axis of symmetry, which opens to the external environment via a channel ∼10 Å in diameter that is lined with patches of negatively charged residues. After the EV71 genome has been released, the two-fold channel shrinks, though the overall capsid dimensions are conserved. These structural characteristics identify the two-fold channel as the site where a gateway forms and regulates the process of genome release.
The particles were selected using an automatic selection program (EMAN).
CTF補正
詳細: auto3DEM
最終 再構成
アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 6.3 Å / 解像度の算出法: FSC 0.5 CUT-OFF / ソフトウェア - 名称: EMAN2, auto3DEM / 詳細: A single data set was used for the reconstruction / 使用した粒子像数: 11436
Chain - #0 - Chain ID: A / Chain - #1 - Chain ID: B / Chain - #2 - Chain ID: C
ソフトウェア
名称: Chimera, Situs
詳細
Protocol: rigid body. One protomer was fit in Chimera, used to generate a full crystal map, then docked as a rigid body using Situs into the cryoEM density map.
精密化
空間: REAL / プロトコル: RIGID BODY FIT / 当てはまり具合の基準: correlation coefficient