ジャーナル: Proc Natl Acad Sci U S A / 年: 2012 タイトル: Structure and assembly of a paramyxovirus matrix protein. 著者: Anthony J Battisti / Geng Meng / Dennis C Winkler / Lori W McGinnes / Pavel Plevka / Alasdair C Steven / Trudy G Morrison / Michael G Rossmann / 要旨: Many pleomorphic, lipid-enveloped viruses encode matrix proteins that direct their assembly and budding, but the mechanism of this process is unclear. We have combined X-ray crystallography and ...Many pleomorphic, lipid-enveloped viruses encode matrix proteins that direct their assembly and budding, but the mechanism of this process is unclear. We have combined X-ray crystallography and cryoelectron tomography to show that the matrix protein of Newcastle disease virus, a paramyxovirus and relative of measles virus, forms dimers that assemble into pseudotetrameric arrays that generate the membrane curvature necessary for virus budding. We show that the glycoproteins are anchored in the gaps between the matrix proteins and that the helical nucleocapsids are associated in register with the matrix arrays. About 90% of virions lack matrix arrays, suggesting that, in agreement with previous biological observations, the matrix protein needs to dissociate from the viral membrane during maturation, as is required for fusion and release of the nucleocapsid into the host's cytoplasm. Structure and sequence conservation imply that other paramyxovirus matrix proteins function similarly.
構造決定の手法: 単波長異常分散 / 解像度: 2.2→30 Å / Cor.coef. Fo:Fc: 0.918 / Cor.coef. Fo:Fc free: 0.883 / SU B: 13.541 / SU ML: 0.176 / 交差検証法: THROUGHOUT / σ(F): 2 / ESU R: 0.305 / ESU R Free: 0.241 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD / 詳細: HYDROGENS HAVE BEEN USED IF PRESENT IN THE INPUT
Rfactor
反射数
%反射
Selection details
Rfree
0.27
1920
5 %
RANDOM
Rwork
0.22
-
-
-
obs
0.22
36499
98.92 %
-
all
-
3700
-
-
溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK