3C-like protease
SARS-CoV-2 main proteinase dimer with the catalytic dyad (H41; C145) in complex with a covalent peptidomimetic protease inhibitor ("11a", magenta). From PDB: 6LZE. | |||||||||
| Identifiers | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| EC no. | 3.4.22.69 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| |||||||||
| Peptidase C30, Coronavirus endopeptidase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| Symbol | Peptidase_C30 | ||||||||
| Pfam | PF05409 | ||||||||
| InterPro | IPR008740 | ||||||||
| PROSITE | PS51442 | ||||||||
| MEROPS | C30 | ||||||||
| SCOP2 | d1q2wb1 / SCOPe / SUPFAM | ||||||||
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The 3C-like protease (3CLpro) or main protease (Mpro), formally known as C30 endopeptidase or 3-chymotrypsin-like protease, is the main protease found in coronaviruses. It cleaves the coronavirus polyprotein at eleven conserved sites. It is a cysteine protease and a member of the PA clan of proteases. It has a cysteine-histidine catalytic dyad at its active site and cleaves a Gln–(Ser/Ala/Gly) peptide bond.
The Enzyme Commission refers to this family as SARS coronavirus main proteinase (Mpro; EC 3.4.22.69). The 3CL protease corresponds to coronavirus nonstructural protein 5 (nsp5). The "3C" in the common name refers to the 3C protease (3Cpro) which is a homologous protease found in picornaviruses.