IUBMB Enzyme Nomenclature


Accepted name: SARS coronavirus main proteinase

Reaction: TSAVLQSGFRK-NH2 and SGVTFQGKFKK the two peptides corresponding to the two self-cleavage sites of the SARS 3C-like proteinase are the two most reactive peptide substrates. The enzyme exhibits a strong preference for substrates containing Gln at P1 position and Leu at P2 position.

Other name(s): 3cLpro; 3C-like protease; coronavirus 3C-like protease; Mpro; SARS 3C-like protease; SARS coronavirus 3CL protease; SARS coronavirus main peptidase; SARS coronavirus main protease; SARS-CoV 3CLpro enzyme; SARS-CoV main protease; SARS-CoV Mpro; severe acute respiratory syndrome coronavirus main protease

Comments: SARS coronavirus main protease is the key enzyme in SARS coronavirus replicase polyprotein processing. In peptidase family C30.

Links to other databases: EXPASY, KEGG, MEROPS, Metacyc, PDB, CAS registry number:


1. Goetz, D.H., Choe, Y., Hansell, E., Chen, Y.T., McDowell, M., Jonsson, C.B., Roush, W.R., McKerrow, J. and Craik, C.S. Substrate specificity profiling and identification of a new class of inhibitor for the major protease of the SARS coronavirus. Biochemistry 46 (2007) 8744-8752. [PMID: 17605471]

2. Fan, K., Wei, P., Feng, Q., Chen, S., Huang, C., Ma, L., Lai, B., Pei, J., Liu, Y., Chen, J. and Lai, L. Biosynthesis, purification, and substrate specificity of severe acute respiratory syndrome coronavirus 3C-like proteinase. J. Biol. Chem. 279 (2004) 1637-1642. [PMID: 14561748]

3. Akaji, K., Konno, H., Onozuka, M., Makino, A., Saito, H. and Nosaka, K. Evaluation of peptide-aldehyde inhibitors using R188I mutant of SARS 3CL protease as a proteolysis-resistant mutant. Bioorg. Med. Chem. 16:9400 (2008). [PMID: 18845442]

[EC created 2009]

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