Design and crystal structure of a native-like HIV-1 envelope trimer that engages multiple broadly neutralizing antibody precursors in vivo.

Design and crystal structure of a native-like HIV-1 envelope trimer that engages multiple broadly neutralizing antibody precursors in vivo.
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DOI:
10.1084/jem.20161160
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发表时间:
2017-09-04
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Sanders RW
Sanders RW
中科院分区:
其他
文献类型:
--
作者:
Medina-Ramírez M;Garces F;Escolano A;Skog P;de Taeye SW;Del Moral-Sanchez I;McGuire AT;Yasmeen A;Behrens AJ;Ozorowski G;van den Kerkhof TLGM;Freund NT;Dosenovic P;Hua Y;Gitlin AD;Cupo A;van der Woude P;Golabek M;Sliepen K;Blane T;Kootstra N;van Breemen MJ;Pritchard LK;Stanfield RL;Crispin M;Ward AB;Stamatatos L;Klasse PJ;Moore JP;Nemazee D;Nussenzweig MC;Wilson IA;Sanders RW

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Induction of broadly neutralizing antibodies (bNAbs) to HIV would be a major advance toward an effective vaccine. A critical step in this process is the activation of naive B cells expressing bNAb precursors. Medina-Ramírez et al. developed a BG505 SOSIP.v4.1-GT1 trimer that activates bNAb precursors in vitro and in vivo. Induction of broadly neutralizing antibodies (bNAbs) by HIV-1 envelope glycoprotein immunogens would be a major advance toward an effective vaccine. A critical step in this process is the activation of naive B cells expressing germline (gl) antibody precursors that have the potential to evolve into bNAbs. Here, we reengineered the BG505 SOSIP.664 glycoprotein to engage gl precursors of bNAbs that target either the trimer apex or the CD4-binding site. The resulting BG505 SOSIP.v4.1-GT1 trimer binds multiple bNAb gl precursors in vitro. Immunization experiments in knock-in mice expressing gl-VRC01 or gl-PGT121 show that this trimer activates B cells in vivo, resulting in the secretion of specific antibodies into the sera. A crystal structure of the gl-targeting trimer at 3.2-Å resolution in complex with neutralizing antibodies 35O22 and 9H+109L reveals a native-like conformation and the successful incorporation of design features associated with binding of multiple gl-bNAb precursors.
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