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Koenig, Paul-Albert; Das, Hrishikesh; Liu, Hejun; Kümmerer, Beate M; Gohr, Florian N; Jenster, Lea-Marie; Schiffelers, Lisa D J; Tesfamariam, Yonas M; Uchima, Miki; Wuerth, Jennifer D; Gatterdam, Karl; Ruetalo, Natalia; Christensen, Maria H; Fandrey, Caroline I; Normann, Sabine; Tödtmann, Jan M P; Pritzl, Steffen; Hanke, Leo; Boos, Jannik; Yuan, Meng; Zhu, Xueyong; Schmid-Burgk, Jonathan L; Kato, Hiroki; Schindler, Michael; Wilson, Ian A; Geyer, Matthias; Ludwig, Kerstin U; Hällberg, B Martin; Wu, Nicholas C; Schmidt, Florian I
Science (American Association for the Advancement of Science), 02/2021, Letnik: 371, Številka: 6530Journal Article
The pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) continues to spread, with devastating consequences. For passive immunization efforts, nanobodies have size and cost advantages over conventional antibodies. In this study, we generated four neutralizing nanobodies that target the receptor binding domain of the SARS-CoV-2 spike protein. We used x-ray crystallography and cryo-electron microscopy to define two distinct binding epitopes. On the basis of these structures, we engineered multivalent nanobodies with more than 100 times the neutralizing activity of monovalent nanobodies. Biparatopic nanobody fusions suppressed the emergence of escape mutants. Several nanobody constructs neutralized through receptor binding competition, whereas other monovalent and biparatopic nanobodies triggered aberrant activation of the spike fusion machinery. These premature conformational changes in the spike protein forestalled productive fusion and rendered the virions noninfectious.
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in: SICRIS
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