National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
75N93019C00051
米国
引用
ジャーナル: Cell Rep / 年: 2021 タイトル: Polyclonal epitope mapping reveals temporal dynamics and diversity of human antibody responses to H5N1 vaccination. 著者: Julianna Han / Aaron J Schmitz / Sara T Richey / Ya-Nan Dai / Hannah L Turner / Bassem M Mohammed / Daved H Fremont / Ali H Ellebedy / Andrew B Ward / 要旨: Novel influenza A virus (IAV) strains elicit recall immune responses to conserved epitopes, making them favorable antigenic choices for universal influenza virus vaccines. Evaluating these immunogens ...Novel influenza A virus (IAV) strains elicit recall immune responses to conserved epitopes, making them favorable antigenic choices for universal influenza virus vaccines. Evaluating these immunogens requires a thorough understanding of the antigenic sites targeted by the polyclonal antibody (pAb) response, which single-particle electron microscopy (EM) can sensitively detect. In this study, we employ EM polyclonal epitope mapping (EMPEM) to extensively characterize the pAb response to hemagglutinin (HA) after H5N1 immunization in humans. Cross-reactive pAbs originating from memory B cells immediately bound the stem of HA and persisted for more than a year after vaccination. In contrast, de novo pAb responses to multiple sites on the head of HA, targeting previously determined key neutralizing sites on H5 HA, expanded after the second immunization and waned quickly. Thus, EMPEM provides a robust tool for comprehensively tracking the specificity and durability of immune responses elicited by novel universal influenza vaccine candidates.
全体 : CryoEM polyclonal immune complex of Fab binding the vestigial est...
全体
名称: CryoEM polyclonal immune complex of Fab binding the vestigial esterase domain of H5 HA from serum of subject 4 at day 28
要素
複合体: CryoEM polyclonal immune complex of Fab binding the vestigial esterase domain of H5 HA from serum of subject 4 at day 28
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超分子 #1: CryoEM polyclonal immune complex of Fab binding the vestigial est...
超分子
名称: CryoEM polyclonal immune complex of Fab binding the vestigial esterase domain of H5 HA from serum of subject 4 at day 28 タイプ: complex / ID: 1 / 親要素: 0
由来(天然)
生物種: Homo sapiens (ヒト) / 細胞中の位置: PBMC
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
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
緩衝液
pH: 7.4
凍結
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277.15 K / 装置: FEI VITROBOT MARK IV
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 53.1 e/Å2