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. 2020 May 30;10(7):1175–1191. doi: 10.1016/j.apsb.2020.05.009

Figure 1.

Figure 1

Coronavirus and spike protein (S) structures. (A) Schematic structure of coronavirus and its key structural proteins, including spike (S), nucleocapsid (N), membrane (M), envelope (E) proteins. (B) Schematic structure of coronavirus S protein and its functional regions. S protein is composed of S1 and S2 subunits. SP, signal peptide. RBD, receptor-binding domain. RBM, receptor-binding motif. FP, fusion peptide. HR1 and HR2, heptad repeat one and two regions. TM, transmembrane. CP, cytoplasmic tail.