3.4.22.B50 ubiquitin-7-amido-4-trifluoromethylcoumarin + H2O the enzyme catalyzes proteolytic processing of the viral polyprotein and also shows significant in vitro deubiquitinating and de-ISGylating activities. The enzyme binds ubiquitin, the ubiquitin core makes mostly hydrophilic interactions with the enzyme, while the Leu-Arg-Gly-Gly C-terminus of ubiquitin is located in the catalytic cleft of the enzyme. The ubiquitin core binds to the palm, thumb and fingers domains of the enzyme, while its final four C-terminal residues bind into a narrow channel by a network of hydrogen bonds and reach towards the active site Severe acute respiratory syndrome-related coronavirus ubiquitin + 7-amino-4-trifluoromethylcoumarin - ? 432450 3.4.22.B50 azocasein + H2O - Tabernaemontana divaricata ? - ? 15347 3.4.22.B50 Gelatin + H2O - Tabernaemontana divaricata ? - ? 16570 3.4.22.B50 N-benzoyl-Phe-Val-Arg-4-nitroanilide + H2O - Tabernaemontana divaricata N-benzoyl-Phe-Val-Arg + 4-nitroaniline - ? 74217