National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R01-AI127521
米国
引用
ジャーナル: Cell Rep / 年: 2021 タイトル: Stabilized coronavirus spike stem elicits a broadly protective antibody. 著者: Ching-Lin Hsieh / Anne P Werner / Sarah R Leist / Laura J Stevens / Ester Falconer / Jory A Goldsmith / Chia-Wei Chou / Olubukola M Abiona / Ande West / Kathryn Westendorf / Krithika ...著者: Ching-Lin Hsieh / Anne P Werner / Sarah R Leist / Laura J Stevens / Ester Falconer / Jory A Goldsmith / Chia-Wei Chou / Olubukola M Abiona / Ande West / Kathryn Westendorf / Krithika Muthuraman / Ethan J Fritch / Kenneth H Dinnon / Alexandra Schäfer / Mark R Denison / James D Chappell / Ralph S Baric / Barney S Graham / Kizzmekia S Corbett / Jason S McLellan / 要旨: Current coronavirus (CoV) vaccines primarily target immunodominant epitopes in the S1 subunit, which are poorly conserved and susceptible to escape mutations, thus threatening vaccine efficacy. Here, ...Current coronavirus (CoV) vaccines primarily target immunodominant epitopes in the S1 subunit, which are poorly conserved and susceptible to escape mutations, thus threatening vaccine efficacy. Here, we use structure-guided protein engineering to remove the S1 subunit from the Middle East respiratory syndrome (MERS)-CoV spike (S) glycoprotein and develop stabilized stem (SS) antigens. Vaccination with MERS SS elicits cross-reactive β-CoV antibody responses and protects mice against lethal MERS-CoV challenge. High-throughput screening of antibody-secreting cells from MERS SS-immunized mice led to the discovery of a panel of cross-reactive monoclonal antibodies. Among them, antibody IgG22 binds with high affinity to both MERS-CoV and severe acute respiratory syndrome (SARS)-CoV-2 S proteins, and a combination of electron microscopy and crystal structures localizes the epitope to a conserved coiled-coil region in the S2 subunit. Passive transfer of IgG22 protects mice against both MERS-CoV and SARS-CoV-2 challenge. Collectively, these results provide a proof of principle for cross-reactive CoV antibodies and inform the development of pan-CoV vaccines and therapeutic antibodies.
超分子 #1: complex of Fab22 bound to SARS-CoV-2 spike
超分子
名称: complex of Fab22 bound to SARS-CoV-2 spike / タイプ: complex / ID: 1 / 親要素: 0
由来(天然)
生物種: Severe acute respiratory syndrome coronavirus 2 (ウイルス)
組換発現
生物種: Homo sapiens (ヒト)
分子量
理論値: 167.3 kDa/nm
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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
濃度
0.37 mg/mL
緩衝液
pH: 8 / 詳細: 2 mM Tris pH 8.0, 200 mM NaCl, 0.02% NaN3
グリッド
モデル: C-flat-1.2/1.3 / 材質: COPPER / メッシュ: 400
凍結
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 295 K / 装置: FEI VITROBOT MARK IV 詳細: blotted for 3.5 seconds with -4 force in a Vitrobot Mark IV and plunge-frozen into liquid ethane.
詳細
purified SARS-CoV-2 S (HexaPro variant) complexed with 2-fold molar excess of Fab22 was diluted to a concentration of 0.37 mg/mL in 2 mM Tris pH 8.0, 200 mM NaCl, 0.02% NaN3
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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 K3 (6k x 4k) / 平均電子線量: 37.2 e/Å2
電子線
加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN
電子光学系
照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 2.7 mm / 倍率(公称値): 22500
実験機器
モデル: Titan Krios / 画像提供: FEI Company
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画像解析
初期モデル
モデルのタイプ: NONE / 詳細: Ab initio reconstruction in cryoSPARC