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Multimerization- and glycosylation-dependent receptor binding of SARS-CoV-2 spike proteins
Kim Marielle Bouwman; Hannah L Turner; Roosmarijn van der Woude; Gerlof P Bosman; Sander Herfst; Barry Rockx; Bart Haagmans; Andrew Ward; Geert-Jan Boons; Robert Paul de Vries.
Afiliación
  • Kim Marielle Bouwman; Utrecht Institute for Pharmaceutical Sciences, Utrecht University
  • Hannah L Turner; The Scripps Research Institute
  • Roosmarijn van der Woude; Utrecht University
  • Gerlof P Bosman; Utrecht Institute for Pharmaceutical Sciences, Utrecht University
  • Sander Herfst; ErasmusMC
  • Barry Rockx; Erasmus University Medical Center
  • Bart Haagmans; Erasmus Medical Center
  • Andrew Ward; The Scripps Research Institute
  • Geert-Jan Boons; University of Georgia
  • Robert Paul de Vries; Utrecht Institute for Pharmaceutical Sciences, Utrecht University
Preprint en En | PREPRINT-BIORXIV | ID: ppbiorxiv-282558
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ABSTRACT
Receptor binding studies using recombinant SARS-CoV proteins have been hampered due to challenges in approaches creating spike protein or domains thereof, that recapitulate receptor binding properties of native viruses. We hypothesized that trimeric RBD proteins would be suitable candidates to study receptor binding properties of SARS-CoV-1 and -2. Here we created monomeric and trimeric fluorescent RBD proteins, derived from adherent HEK293T, as well as in GnTI mutant cells, to analyze the effect of complex vs high mannose glycosylation on receptor binding. The results demonstrate that trimeric fully glycosylated proteins are superior in receptor binding compared to monomeric and immaturely glycosylated variants. Although differences in binding to commonly used cell lines were minimal between the different RBD preparations, substantial differences were observed when respiratory tissues of experimental animals were stained. The RBD trimers demonstrated distinct ACE2 expression profiles in bronchiolar ducts and confirmed the higher binding affinity of SARS-CoV-2 over SARS-CoV-1. Our results show that fully glycosylated trimeric RBD proteins are attractive to analyze receptor binding and explore ACE2 expression profiles in tissues.
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Texto completo: 1 Colección: 09-preprints Base de datos: PREPRINT-BIORXIV Idioma: En Año: 2020 Tipo del documento: Preprint
Texto completo: 1 Colección: 09-preprints Base de datos: PREPRINT-BIORXIV Idioma: En Año: 2020 Tipo del documento: Preprint