FIGURE 2.

(a) Schematic of full‐length Spike protein. CP: cytoplasmic peptide; FP: fusion peptide; HR1, HR2: heptad repeats 1 and 2; NTD: N‐terminal domain; RBD: Ribosome‐binding domain; SS: signal sequence; TM: transmembrane domain. (b) Amino acid sequence of the RBD‐MBP fusion protein used in this study. Domains are colored as follows: ×10 His (orange), MBP (white), RBD (tan), RBM (purple), and S1 (green); short linker sequences are shown in red, and the TEV cleavage site is in light blue. Two sites of N‐linked glycosylation are colored blue