Fig. 1.

Cartoon representation of the interaction between SARS-CoV-2 S-protein RBD and ACE2. Positions and names of the hot spot residues of the SARS-CoV-2 S-protein RBD/ACE2 are shown. The hydrogen bonds between intra-protein residues are shown by yellow dotted line. The Protein Data Bank (PDB) code for SARS-CoV-2 S-protein is 6VXX, PDB code for RBD region is 7C01 and PDB code for ACE2 is 1R42