ジャーナル: J Virol / 年: 2013 タイトル: Antibody recognition of the pandemic H1N1 Influenza virus hemagglutinin receptor binding site. 著者: Minsun Hong / Peter S Lee / Ryan M B Hoffman / Xueyong Zhu / Jens C Krause / Nick S Laursen / Sung-Il Yoon / Langzhou Song / Lynda Tussey / James E Crowe / Andrew B Ward / Ian A Wilson 要旨: Influenza virus is a global health concern due to its unpredictable pandemic potential. This potential threat was realized in 2009 when an H1N1 virus emerged that resembled the 1918 virus in ...Influenza virus is a global health concern due to its unpredictable pandemic potential. This potential threat was realized in 2009 when an H1N1 virus emerged that resembled the 1918 virus in antigenicity but fortunately was not nearly as deadly. 5J8 is a human antibody that potently neutralizes a broad spectrum of H1N1 viruses, including the 1918 and 2009 pandemic viruses. Here, we present the crystal structure of 5J8 Fab in complex with a bacterially expressed and refolded globular head domain from the hemagglutinin (HA) of the A/California/07/2009 (H1N1) pandemic virus. 5J8 recognizes a conserved epitope in and around the receptor binding site (RBS), and its HCDR3 closely mimics interactions of the sialic acid receptor. Electron microscopy (EM) reconstructions of 5J8 Fab in complex with an HA trimer from a 1986 H1 strain and with an engineered stabilized HA trimer from the 2009 H1 pandemic virus showed a similar mode of binding. As for other characterized RBS-targeted antibodies, 5J8 uses avidity to extend its breadth and affinity against divergent H1 strains. 5J8 selectively interacts with HA insertion residue 133a, which is conserved in pandemic H1 strains and has precluded binding of other RBS-targeted antibodies. Thus, the RBS of divergent HAs is targeted by 5J8 and adds to the growing arsenal of common recognition motifs for design of therapeutics and vaccines. Moreover, consistent with previous studies, the bacterially expressed H1 HA properly refolds, retaining its antigenic structure, and presents a low-cost and rapid alternative for engineering and manufacturing candidate flu vaccines.
超分子 #1000: Influenza hemagglutinin (A/California/4/2009, H1N1) bound to neut...
超分子
名称: Influenza hemagglutinin (A/California/4/2009, H1N1) bound to neutralizing antibody (Fab 5J8) タイプ: sample / ID: 1000 / 集合状態: One HA trimer bound to three Fabs / Number unique components: 2
分子量
理論値: 289 KDa
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分子 #1: 5J8 Fab fragment
分子
名称: 5J8 Fab fragment / タイプ: protein_or_peptide / ID: 1 / 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: 46 KDa
組換発現
生物種: Trichoplusia ni (イラクサキンウワバ) / 組換細胞: High Five / 組換プラスミド: pFastBac Dual
タイプ: NEGATIVE 詳細: two cycles of "Nano-W" (2% methylamine tungstate) applied for 20 seconds
グリッド
詳細: 400 mesh copper grids coated in nitrocellulose and thin carbon, glow discharged in argon/oxygen
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
温度
平均: 298 K
アライメント法
Legacy - 非点収差: Objective lens astigmatism corrected at 100,000 times magnification.
日付
2013年2月14日
撮影
カテゴリ: CCD フィルム・検出器のモデル: TVIPS TEMCAM-F416 (4k x 4k) 実像数: 462 詳細: Tilt series varying from 0-55 degrees, alternating low and high tilts on similarly stained regions
試料ホルダーモデル: SIDE ENTRY, EUCENTRIC / Tilt angle max: 55
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画像解析
詳細
Particles were selected using automatic (difference-of-Gaussians) picking followed by reference-free classification to eliminate noisy picks or non-target aggregation states.
最終 再構成
アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 23.0 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: Appion, Spider, Xmipp, Eman1 / 使用した粒子像数: 5106