oV with an inhibitor 3X5 240 µM [27] 4OVZ CoV PLPro complexed with inhibitor P85 490 nM [31] 3MJ5 SARS-CoV PLPro complexed with inhibitor GRM 320 nM [32] 2FE8 SARS-CoV PLPro - - [33] 1UK4 SARS-CoV 3CLPro and its interactions with an inhibitor Substrate analog hexapeptidyl CMK inhibitor IC50 ca. 2 mM [34] 1UJ1, 1UK3, 1UK2 SARS-CoV M-pro, apo-enzyme at different pH - - [34] 3VB6 SARS-CoV 3CLPro in complex with C6Z C6Z 39 µM [35] 3VB5 SARS