Table 1. Modified Cys Residues upon Incubation of 3CLpro with 3 Determined by Protein Digestion Analysisa.
| peptide | site of labeling | function |
|---|---|---|
| H.VIC[3]TSEDMLNPNYEDLLIR.K | Cys44 | active site Cys |
| R.VIGHSMQNC[3]VLK.L | Cys85 | surface accessible Cys |
| D.YDC[3]VSFCYMHHMELPTGVHAGTDLEGNFYGPFVDR.Q | Cys156 | surface accessible Cys |
| R.TILGSALLEDEFTPFDVVRQC[3]SGVTF.Q | Cys300 | surface accessible Cys |
Re(V)-modified residues are indicated by the C[3] designation. Periods at the start and end of each sequence indicate peptide cleavage sites. Experimental details can be found in the Experimental Section.