ジャーナル: J Virol / 年: 2013 タイトル: Identification and structural characterization of a broadly neutralizing antibody targeting a novel conserved epitope on the influenza virus H5N1 hemagglutinin. 著者: Lanying Du / Lei Jin / Guangyu Zhao / Shihui Sun / Junfeng Li / Hong Yu / Ye Li / Bo-Jian Zheng / Robert C Liddington / Yusen Zhou / Shibo Jiang / 要旨: The unabated circulation of the highly pathogenic avian influenza A virus/H5N1 continues to be a serious threat to public health worldwide. Because of the high frequency of naturally occurring ...The unabated circulation of the highly pathogenic avian influenza A virus/H5N1 continues to be a serious threat to public health worldwide. Because of the high frequency of naturally occurring mutations, the emergence of H5N1 variants with high virulence has raised great concerns about the potential transmissibility of the virus in humans. Recent studies have shown that laboratory-mutated or reassortant H5N1 viruses could be efficiently transmitted among mammals, particularly ferrets, the best animal model for humans. Thus, it is critical to establish effective strategies to combat future H5N1 pandemics. In this study, we identified a broadly neutralizing monoclonal antibody (MAb), HA-7, that potently neutralized all tested strains of H5N1 covering clades 0, 1, 2.2, 2.3.4, and 2.3.2.1 and completely protected mice against lethal challenges of H5N1 viruses from clades 1 and 2.3.4. HA-7 specifically targeted the globular head of the H5N1 virus hemagglutinin (HA). Using electron microscopy technology with three-dimensional reconstruction (3D-EM), we discovered that HA-7 bound to a novel and highly conserved conformational epitope that was centered on residues 81 to 83 and 117 to 122 of HA1 (H5 numbering). We further demonstrated that HA-7 inhibited viral entry during postattachment events but not at the receptor-binding step, which is fully consistent with the 3D-EM result. Taken together, we propose that HA-7 could be humanized as an effective passive immunotherapeutic agent for antiviral stockpiling for future influenza pandemics caused by emerging unpredictable H5N1 strains. Our study also provides a sound foundation for the rational design of vaccines capable of inducing broad-spectrum immunity against H5N1.
全体 : the complex of Fab Fragment of HA7 monoclonal antibody and avian ...
全体
名称: the complex of Fab Fragment of HA7 monoclonal antibody and avian influenza virus hemagglutinin
要素
試料: the complex of Fab Fragment of HA7 monoclonal antibody and avian influenza virus hemagglutinin
タンパク質・ペプチド: Fab Fragment of HA7 monoclonal antibody
タンパク質・ペプチド: Avian influenza virus hemagglutinin
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超分子 #1000: the complex of Fab Fragment of HA7 monoclonal antibody and avian ...
超分子
名称: the complex of Fab Fragment of HA7 monoclonal antibody and avian influenza virus hemagglutinin タイプ: sample / ID: 1000 / 詳細: The trimeric sample was monodisperse. / 集合状態: one trimeric hemagglutinin binds to three Fab / Number unique components: 2
分子量
実験値: 370 KDa / 理論値: 370 KDa / 手法: based on protein sequences and SDS-PAGE
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分子 #1: Fab Fragment of HA7 monoclonal antibody
分子
名称: Fab Fragment of HA7 monoclonal antibody / タイプ: protein_or_peptide / ID: 1 / コピー数: 3 / 集合状態: trimer / 組換発現: Yes