ジャーナル: Cell / 年: 2015 タイトル: Immunogenicity of Stabilized HIV-1 Envelope Trimers with Reduced Exposure of Non-neutralizing Epitopes. 著者: Steven W de Taeye / Gabriel Ozorowski / Alba Torrents de la Peña / Miklos Guttman / Jean-Philippe Julien / Tom L G M van den Kerkhof / Judith A Burger / Laura K Pritchard / Pavel Pugach / ...著者: Steven W de Taeye / Gabriel Ozorowski / Alba Torrents de la Peña / Miklos Guttman / Jean-Philippe Julien / Tom L G M van den Kerkhof / Judith A Burger / Laura K Pritchard / Pavel Pugach / Anila Yasmeen / Jordan Crampton / Joyce Hu / Ilja Bontjer / Jonathan L Torres / Heather Arendt / Joanne DeStefano / Wayne C Koff / Hanneke Schuitemaker / Dirk Eggink / Ben Berkhout / Hansi Dean / Celia LaBranche / Shane Crotty / Max Crispin / David C Montefiori / P J Klasse / Kelly K Lee / John P Moore / Ian A Wilson / Andrew B Ward / Rogier W Sanders / 要旨: The envelope glycoprotein trimer mediates HIV-1 entry into cells. The trimer is flexible, fluctuating between closed and more open conformations and sometimes sampling the fully open, CD4-bound form. ...The envelope glycoprotein trimer mediates HIV-1 entry into cells. The trimer is flexible, fluctuating between closed and more open conformations and sometimes sampling the fully open, CD4-bound form. We hypothesized that conformational flexibility and transient exposure of non-neutralizing, immunodominant epitopes could hinder the induction of broadly neutralizing antibodies (bNAbs). We therefore modified soluble Env trimers to stabilize their closed, ground states. The trimer variants were indeed stabilized in the closed conformation, with a reduced ability to undergo receptor-induced conformational changes and a decreased exposure of non-neutralizing V3-directed antibody epitopes. In rabbits, the stabilized trimers induced similar autologous Tier-1B or Tier-2 NAb titers to those elicited by the corresponding wild-type trimers but lower levels of V3-directed Tier-1A NAbs. Stabilized, closed trimers might therefore be useful components of vaccines aimed at inducing bNAbs.
全体 : HIV-1 Env AMC008 SOSIP.v4 in complex with broadly neutralizing an...
全体
名称: HIV-1 Env AMC008 SOSIP.v4 in complex with broadly neutralizing antibody Fabs 35O22 and PGV04
要素
試料: HIV-1 Env AMC008 SOSIP.v4 in complex with broadly neutralizing antibody Fabs 35O22 and PGV04
タンパク質・ペプチド: HIV-1 AMC008 Env SOSIP.v4
タンパク質・ペプチド: Anti-HIV-1 antibody PGV04 Fab
タンパク質・ペプチド: Anti-HIV-1 antibody 35O22 Fab
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超分子 #1000: HIV-1 Env AMC008 SOSIP.v4 in complex with broadly neutralizing an...
超分子
名称: HIV-1 Env AMC008 SOSIP.v4 in complex with broadly neutralizing antibody Fabs 35O22 and PGV04 タイプ: sample / ID: 1000 詳細: All components were purified by size-exclusion chromatography prior to complex formation. 集合状態: 3 of each Fab bound to a trimer of HIV-1 Env SOSIP.v4 Number unique components: 3
分子量
理論値: 720 KDa 手法: Estimation based on average molecular weight of Fab and average mass of SOSIP trimer including glycan mass
試料ホルダーモデル: SIDE ENTRY, EUCENTRIC / Tilt angle min: -50
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画像解析
詳細
Particles were selected using an automatic selection program and aligned into class averages using Iterative MSA/MRA. Classes containing fully decorated (3 molecules of each Fab per trimer) complexes were used to generate a common lines model that was later refined using particles from those classes.
最終 再構成
アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 15.0 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: EMAN2, SPARX / 使用した粒子像数: 24522