Incorporation of SARS-CoV-2 S protein into pseudovirions.
a Diagram of full-length SARS-CoV-2 S protein with a 3xFLAG tag. S1, receptor-binding subunit; S2, membrane fusion subunit; TM, transmembrane domain; NTD, N-terminal domain; pFP, potential fusion peptide; HR-N, heptad repeat-N; HR-C, heptad repeat-C; b–f Detection of CoVs S protein in cells lysate by western blot. Mock, 293T cells transfected with empty vector. b Mouse monoclonal anti-FLAG M2 antibody; c Polyclonal goat anti-MHV-A59 S protein antibody AO4. d Polyclonal rabbit anti-SARS S1 antibodies T62. e Mouse monoclonal anti-SARS S1 antibody. f Mouse monoclonal anti-MERS-CoV S2 antibody. g–j Detection of CoVs S protein in pseudovirions by western blot.Gag-p24 served as a loading control. g Anti-FLAG M2. h Polyclonal goat anti-MHV-A59 S protein antibody AO4. i Polyclonal rabbit anti-SARS S1 antibodies T62. j Polyclonal anti-Gag-p24 antibodies. uncleaved S protein, about 180 kDa; cleaved S protein, about 90 kDa. Experiments were done twice and one is shown. Source data are provided as a Source Data file.