ジャーナル: Cell / 年: 2021 タイトル: Human antibody C10 neutralizes by diminishing Zika but enhancing dengue virus dynamics. 著者: Xin-Xiang Lim / Bo Shu / Shuijun Zhang / Aaron W K Tan / Thiam-Seng Ng / Xin-Ni Lim / Valerie S-Y Chew / Jian Shi / Gavin R Screaton / Shee-Mei Lok / Ganesh S Anand / 要旨: The human monoclonal antibody (HmAb) C10 potently cross-neutralizes Zika virus (ZIKV) and dengue virus. Analysis of antibody fragment (Fab) C10 interactions with ZIKV and dengue virus serotype 2 ...The human monoclonal antibody (HmAb) C10 potently cross-neutralizes Zika virus (ZIKV) and dengue virus. Analysis of antibody fragment (Fab) C10 interactions with ZIKV and dengue virus serotype 2 (DENV2) particles by cryoelectron microscopy (cryo-EM) and amide hydrogen/deuterium exchange mass spectrometry (HDXMS) shows that Fab C10 binding decreases overall ZIKV particle dynamics, whereas with DENV2, the same Fab causes increased dynamics. Testing of different Fab C10:DENV2 E protein molar ratios revealed that, at higher Fab ratios, especially at saturated concentrations, the Fab enhanced viral dynamics (detected by HDXMS), and observation under cryo-EM showed increased numbers of distorted particles. Our results suggest that Fab C10 stabilizes ZIKV but that with DENV2 particles, high Fab C10 occupancy promotes E protein dimer conformational changes leading to overall increased particle dynamics and distortion of the viral surface. This is the first instance of a broadly neutralizing antibody eliciting virus-specific increases in whole virus particle dynamics.
B: Envelope protein E E: Small envelope protein M A: Envelope protein E D: Small envelope protein M C: Envelope protein E F: Small envelope protein M I: C10 IgG light chain variable region M: C10 IgG heavy chain variable region G: C10 IgG light chain variable region H: C10 IgG heavy chain variable region K: C10 IgG light chain variable region L: C10 IgG heavy chain variable region ヘテロ分子
B: Envelope protein E E: Small envelope protein M A: Envelope protein E D: Small envelope protein M C: Envelope protein E F: Small envelope protein M I: C10 IgG light chain variable region M: C10 IgG heavy chain variable region G: C10 IgG light chain variable region H: C10 IgG heavy chain variable region K: C10 IgG light chain variable region L: C10 IgG heavy chain variable region ヘテロ分子
B: Envelope protein E E: Small envelope protein M A: Envelope protein E D: Small envelope protein M C: Envelope protein E F: Small envelope protein M I: C10 IgG light chain variable region M: C10 IgG heavy chain variable region G: C10 IgG light chain variable region H: C10 IgG heavy chain variable region K: C10 IgG light chain variable region L: C10 IgG heavy chain variable region ヘテロ分子
x 5
icosahedral pentamer
1.33 MDa, 60 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
1,328,073
80
ポリマ-
1,322,633
60
非ポリマー
5,440
20
水
0
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
point symmetry operation
4
4
B: Envelope protein E E: Small envelope protein M A: Envelope protein E D: Small envelope protein M C: Envelope protein E F: Small envelope protein M I: C10 IgG light chain variable region M: C10 IgG heavy chain variable region G: C10 IgG light chain variable region H: C10 IgG heavy chain variable region K: C10 IgG light chain variable region L: C10 IgG heavy chain variable region ヘテロ分子