National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
F32GM126760
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01AI147625
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM111795
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
U24GM116792
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
S10OD018111
米国
National Science Foundation (NSF, United States)
DMR-1548924
米国
National Science Foundation (NSF, United States)
DBI-1338135
米国
引用
ジャーナル: Elife / 年: 2020 タイトル: Structural basis for capsid recruitment and coat formation during HSV-1 nuclear egress. 著者: Elizabeth B Draganova / Jiayan Zhang / Z Hong Zhou / Ekaterina E Heldwein / 要旨: During herpesvirus infection, egress of nascent viral capsids from the nucleus is mediated by the viral nuclear egress complex (NEC). NEC deforms the inner nuclear membrane (INM) around the capsid by ...During herpesvirus infection, egress of nascent viral capsids from the nucleus is mediated by the viral nuclear egress complex (NEC). NEC deforms the inner nuclear membrane (INM) around the capsid by forming a hexagonal array. However, how the NEC coat interacts with the capsid and how curved coats are generated to enable budding is yet unclear. Here, by structure-guided truncations, confocal microscopy, and cryoelectron tomography, we show that binding of the capsid protein UL25 promotes the formation of NEC pentagons rather than hexagons. We hypothesize that during nuclear budding, binding of UL25 situated at the pentagonal capsid vertices to the NEC at the INM promotes formation of NEC pentagons that would anchor the NEC coat to the capsid. Incorporation of NEC pentagons at the points of contact with the vertices would also promote assembly of the curved hexagonal NEC coat around the capsid, leading to productive egress of UL25-decorated capsids.
凍結剤: ETHANE / チャンバー内湿度: 100 % / 装置: FEI VITROBOT MARK IV / 詳細: blot for 4 seconds before plunging.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
電子線
加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN
電子光学系
照射モード: OTHER / 撮影モード: DIFFRACTION回折
撮影
フィルム・検出器のモデル: DIRECT ELECTRON DE-16 (4k x 4k) 平均電子線量: 1.64 e/Å2
実験機器
モデル: Titan Krios / 画像提供: FEI Company
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画像解析
抽出
トモグラム数: 1 / 使用した粒子像数: 3078 詳細: The authors' group has resolved the structure and published the result, this experiment serves as a control. Therefore, only one of the ten tomograms was selected randomly to do the ...詳細: The authors' group has resolved the structure and published the result, this experiment serves as a control. Therefore, only one of the ten tomograms was selected randomly to do the subtomograms extraction and the subsequent sub-tomographic averaging.