ジャーナル: EMBO J / 年: 2021 タイトル: Neutralization of SARS-CoV-2 by highly potent, hyperthermostable, and mutation-tolerant nanobodies. 著者: Thomas Güttler / Metin Aksu / Antje Dickmanns / Kim M Stegmann / Kathrin Gregor / Renate Rees / Waltraud Taxer / Oleh Rymarenko / Jürgen Schünemann / Christian Dienemann / Philip Gunkel / ...著者: Thomas Güttler / Metin Aksu / Antje Dickmanns / Kim M Stegmann / Kathrin Gregor / Renate Rees / Waltraud Taxer / Oleh Rymarenko / Jürgen Schünemann / Christian Dienemann / Philip Gunkel / Bianka Mussil / Jens Krull / Ulrike Teichmann / Uwe Groß / Volker C Cordes / Matthias Dobbelstein / Dirk Görlich / 要旨: Monoclonal anti-SARS-CoV-2 immunoglobulins represent a treatment option for COVID-19. However, their production in mammalian cells is not scalable to meet the global demand. Single-domain (VHH) ...Monoclonal anti-SARS-CoV-2 immunoglobulins represent a treatment option for COVID-19. However, their production in mammalian cells is not scalable to meet the global demand. Single-domain (VHH) antibodies (also called nanobodies) provide an alternative suitable for microbial production. Using alpaca immune libraries against the receptor-binding domain (RBD) of the SARS-CoV-2 Spike protein, we isolated 45 infection-blocking VHH antibodies. These include nanobodies that can withstand 95°C. The most effective VHH antibody neutralizes SARS-CoV-2 at 17-50 pM concentration (0.2-0.7 µg per liter), binds the open and closed states of the Spike, and shows a tight RBD interaction in the X-ray and cryo-EM structures. The best VHH trimers neutralize even at 40 ng per liter. We constructed nanobody tandems and identified nanobody monomers that tolerate the K417N/T, E484K, N501Y, and L452R immune-escape mutations found in the Alpha, Beta, Gamma, Epsilon, Iota, and Delta/Kappa lineages. We also demonstrate neutralization of the Beta strain at low-picomolar VHH concentrations. We further discovered VHH antibodies that enforce native folding of the RBD in the E. coli cytosol, where its folding normally fails. Such "fold-promoting" nanobodies may allow for simplified production of vaccines and their adaptation to viral escape-mutations.
名称: SARS-CoV-2 HexaPro S (Spike) glycoprotein / タイプ: protein_or_peptide / ID: 1 詳細: Spike ectodomain (1-1208) with six exchanges to proline (F817P, A892P, A899P, A942P, K986P, V986P), a GSAS substitution at the furin cleavage site (residues 682-685), a C-terminal T4 foldon ...詳細: Spike ectodomain (1-1208) with six exchanges to proline (F817P, A892P, A899P, A942P, K986P, V986P), a GSAS substitution at the furin cleavage site (residues 682-685), a C-terminal T4 foldon trimerization domain, followed by a HRV 3C protease site, a His8-tag and a Twin-Strep tag 光学異性体: LEVO
由来(天然)
生物種: Severe acute respiratory syndrome coronavirus 2 (ウイルス)
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 詳細: sample volume: 3.0 microliters blotting time: 4 s blot force setting: 5.
詳細
The Spike protein was mixed with a 9-fold molar excess of VHH Re5D06 and purified by size exclusion chromatography (Superose 6 Increase 3.2/300, Cytiva). The peak eluate fraction (1 mg/ml) was immediately applied to a freshly glow-discharged grid.
-
電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
特殊光学系
エネルギーフィルター - 名称: GIF Quantum LS / エネルギーフィルター - スリット幅: 20 eV