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.
モノクロメーター: ACCEL/BRUKER double crystal monochromator (DCM) with indirectly cryo-cooled first crystal and sagittally focusing second crystal プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray
放射波長
波長: 0.97949 Å / 相対比: 1
反射
解像度: 2.25→50 Å / Num. obs: 33082 / % possible obs: 97.7 % / Observed criterion σ(I): -3 / 冗長度: 6.6 % / Biso Wilson estimate: 54.2 Å2 / Rmerge(I) obs: 0.06 / Rsym value: 0.06 / Net I/σ(I): 14.9
反射 シェル
解像度: 2.25→2.32 Å / 冗長度: 4.4 % / Rmerge(I) obs: 0.755 / Mean I/σ(I) obs: 1.9 / Num. unique all: 2526 / Rsym value: 0.755 / % possible all: 83.1
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解析
ソフトウェア
名称
バージョン
分類
Blu-Ice
データ収集
PHASER
位相決定
PHENIX
(phenix.refine: 1.8.1_1168)
精密化
XDS
データ削減
XDS
データスケーリング
精密化
構造決定の手法: 分子置換 開始モデル: PDB ENTRY 4M5Y CHAINS H AND L