Table 3. Key Amino Acid Residues Forming the Specific Subsites of the Active Site of MPro.
| subsite | amino acid residues |
|---|---|
| S1 | Phe140, Asn142, His163, Glu166, and His173 |
| S1′ | Thr26, Glu143, and Cys145 |
| S2 | His41, Cys44, Met49, His164, Met165, Val186, and Arg188 |
| S4 | Pro168 and Gln189 |