Selection, biophysical and structural analysis of synthetic nanobodies that effectively neutralize SARS-CoV-2

November 4, 2020

Custódio, T., Das, H., Sheward, D., et al.

Nature Communications 2020, vol: 11 doi: 10.1038/s41467-020-19204-y

Abstract

The coronavirus SARS-CoV-2 is the cause of the ongoing COVID-19 pandemic. Therapeutic neutralizing antibodies constitute a key short-to-medium term approach to tackle COVID-19. However, traditional antibody production is hampered by long development times and costly production. Here, we report the rapid isolation and characterization of nanobodies from a synthetic library, known as sybodies (Sb), that target the receptor-binding domain (RBD) of the SARS-CoV-2 spike protein. Several binders with low nanomolar affinities and efficient neutralization activity were identified of which Sb23 displayed high affinity and neutralized pseudovirus with an IC50 of 0.6 µg/ml. A cryo-EM structure of the spike bound to Sb23 showed that Sb23 binds competitively in the ACE2 binding site. Furthermore, the cryo-EM reconstruction revealed an unusual conformation of the spike where two RBDs are in the ‘up’ ACE2-binding conformation. The combined approach represents an alternative, fast workflow to select binders with neutralizing activity against newly emerging viruses.

View Publication

Topics: Prometheus, nanoDSF, Monolith - MST, Virology, Publications

Previous Article
High-throughput stability screening for detergent-solubilized membrane proteins
High-throughput stability screening for detergent-solubilized membrane proteins

Up next
nanoDSF: In vitro label-free method to monitor Picornavirus uncoating and test compounds affecting particle stability
nanoDSF: In vitro label-free method to monitor Picornavirus uncoating and test compounds affecting particle stability

Ready to tackle your challenging stability characterizations?

Discover tools