ジャーナル: Immunity / 年: 2016 タイトル: Key gp120 Glycans Pose Roadblocks to the Rapid Development of VRC01-Class Antibodies in an HIV-1-Infected Chinese Donor. 著者: Leopold Kong / Bin Ju / Yajing Chen / Linling He / Li Ren / Jiandong Liu / Kunxue Hong / Bin Su / Zheng Wang / Gabriel Ozorowski / Xiaolin Ji / Yuanzi Hua / Yanli Chen / Marc C Deller / ...著者: Leopold Kong / Bin Ju / Yajing Chen / Linling He / Li Ren / Jiandong Liu / Kunxue Hong / Bin Su / Zheng Wang / Gabriel Ozorowski / Xiaolin Ji / Yuanzi Hua / Yanli Chen / Marc C Deller / Yanling Hao / Yi Feng / Fernando Garces / Richard Wilson / Kaifan Dai / Sijy O'Dell / Krisha McKee / John R Mascola / Andrew B Ward / Richard T Wyatt / Yuxing Li / Ian A Wilson / Jiang Zhu / Yiming Shao / 要旨: VRC01-class antibodies neutralize diverse HIV-1 strains by targeting the conserved CD4-binding site. Despite extensive investigations, crucial events in the early stage of VRC01 development remain ...VRC01-class antibodies neutralize diverse HIV-1 strains by targeting the conserved CD4-binding site. Despite extensive investigations, crucial events in the early stage of VRC01 development remain elusive. We demonstrated how VRC01-class antibodies emerged in a Chinese donor by antigen-specific single B cell sorting, structural and functional studies, and longitudinal antibody and virus repertoire analyses. A monoclonal antibody DRVIA7 with modest neutralizing breadth was isolated that displayed a subset of VRC01 signatures. X-ray and EM structures revealed a VRC01-like angle of approach, but less favorable interactions between the DRVIA7 light-chain CDR1 and the N terminus with N276 and V5 glycans of gp120. Although the DRVIA7 lineage was unable to acquire broad neutralization, longitudinal analysis revealed a repertoire-encoded VRC01 light-chain CDR3 signature and VRC01-like neutralizing heavy-chain precursors that rapidly matured within 2 years. Thus, light chain accommodation of the glycan shield should be taken into account in vaccine design targeting this conserved site of vulnerability.
全体 : Fab of broadly neutralizing antibody hybrid DRVIA7/VRC01 in compl...
全体
名称: Fab of broadly neutralizing antibody hybrid DRVIA7/VRC01 in complex with HIV-1 JRFL Env SOSIP.664 trimer
要素
試料: Fab of broadly neutralizing antibody hybrid DRVIA7/VRC01 in complex with HIV-1 JRFL Env SOSIP.664 trimer
タンパク質・ペプチド: HIV-1 Env SOSIP gp140
タンパク質・ペプチド: DRVIA7/VRC01 hybrid anti-HIV antibody Fab
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超分子 #1000: Fab of broadly neutralizing antibody hybrid DRVIA7/VRC01 in compl...
超分子
名称: Fab of broadly neutralizing antibody hybrid DRVIA7/VRC01 in complex with HIV-1 JRFL Env SOSIP.664 trimer タイプ: sample / ID: 1000 詳細: Incubated Fab with trimer overnight at room temperature prior to placing on grid. 集合状態: Trimer of JRFL SOSIP.664 with one Fab bound to each protomer Number unique components: 2
名称: DRVIA7/VRC01 hybrid anti-HIV antibody Fab / タイプ: protein_or_peptide / ID: 2 / 詳細: Heavy chain of DRVIA7 and light chain of VRC01 / コピー数: 3 / 集合状態: Monomer / 組換発現: Yes
由来(天然)
生物種: Homo sapiens (ヒト) / 別称: Human
分子量
理論値: 50 KDa
組換発現
生物種: Homo sapiens (ヒト) / 組換細胞: HEK293F
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実験情報
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構造解析
手法
ネガティブ染色法
解析
単粒子再構成法
試料の集合状態
particle
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試料調製
濃度
0.05 mg/mL
緩衝液
pH: 7.4 / 詳細: 50 mM Tris-HCl, pH 7.4, 150 mM NaCl
染色
タイプ: NEGATIVE 詳細: Grids containing adsorbed protein were treated with 3 uL of 2% w/v uranyl formate for 60 seconds. Uranyl formate was then removed with blotting paper.
グリッド
詳細: Glow-discharged CU400 copper grids with carbon support
凍結
凍結剤: NONE / 装置: OTHER
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電子顕微鏡法
顕微鏡
FEI TECNAI 12
アライメント法
Legacy - 非点収差: Objective lens astigmatism was corrected at 52,000 magnification.
特殊光学系
エネルギーフィルター - 名称: FEI
詳細
A series of tilts from 0 to 50 degrees in 10 degree increments was collected to increase side views.
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 automatically using DogPicker. Initial 2D class averages were inspected; those displaying complexes of trimer with Fab were subjected another round of classification. Only classes that clearly showed two or three Fabs per trimer were used for reconstruction.
最終 再構成
アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 22.0 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: 31789