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. 2020 Aug 11;22(6):21–29. doi: 10.1109/MCSE.2020.3015511

Figure 2.

Figure 2.

Structure of S protein homotrimer and ACE2. Positive and negative residues on a monomer of S protein are colored in blue and red, respectively. (A) ACE2 is colored in gray. The S protein trimer contains three identical monomers, colored in cyan, green, and orange. One monomer (cyan)'s RBD flips out to bind with the ACE2. The S protein is composed by S1 and S2 subunits. (B) Single S protein monomer structure. The orange circle shows the RBD and the black circle marks the flexible hinge connecting RBD and other part of the S protein.