3.4.17.23 analysis receptor binding domain-ACE2 binding assay based on time-resolved FRET, which reliably monitors the interaction in a physiologically relevant and cellular context. The modular assay can monitor the impact of different cellular components, such as heparan sulfate, lipids, and membrane proteins on the receptor binding domain-ACE2 interaction and it can be extended to the full-length spike protein. The assay is high throughput compatible and can detect small-molecule competitive and allosteric modulators of the receptor binding domain-ACE2 interaction 764432 3.4.17.23 D206G deleterious missense variant 762786 3.4.17.23 D355N variant exhibits lower binding to SARS-CoV-2 S protein 762786 3.4.17.23 D38V variant exhibits lower binding to SARS-CoV-2 S protein 762786 3.4.17.23 D509Yr variant exhibits lower binding to SARS-CoV-2 S protein 762786 3.4.17.23 E23K the variant in the binding region increases disease susceptibility towards SARS-CoV-2 762786 3.4.17.23 E329G variant shows a strong binding affinity with SARS-CoV-2 spike protein variants with very strong E329G-V483A, E329G-G476S, strong E329G-A419S, E329G-A348T and moderate E329G-S383C,E329G-F486L interaction 765112 3.4.17.23 E37K non-synonymous single nucleotide polymorphism 765112 3.4.17.23 E484K mutation forms high-affinity complexes (~40% more than wild-type) 763365 3.4.17.23 E484K/N501Y variant possesses both enhanced affinity and antibody resistance 763365