Function and Biology

Crystal structure of the main protease of coronavirus HKU4 in complex with a Michael acceptor SG85

Source organism: Tylonycteris bat coronavirus HKU4
Biochemical function: peptidase activity
Biological process: viral protein processing
Cellular component: not assigned

EC 3.4.22.69: SARS coronavirus main proteinase

Reaction catalysed:
TSAVLQ-|-SGFRK-NH(2) and SGVTFQ-|-GKFKK 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.
Systematic name:
-
Alternative Name(s):
  • 3C-like protease
  • 3cLpro
  • 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 Mpro
  • SARS-CoV main protease
  • Severe acute respiratory syndrome coronavirus main protease

EC 3.4.19.12: Ubiquitinyl hydrolase 1

Reaction catalysed:
Thiol-dependent hydrolysis of ester, thioester, amide, peptide and isopeptide bonds formed by the C-terminal Gly of ubiquitin (a 76-residue protein attached to proteins as an intracellular targeting signal).
Systematic name:
-
Alternative Name(s):
  • Ubiquitin C-terminal hydrolase
  • Ubiquitin carboxyl-terminal hydrolase
  • Ubiquitin thiolesterase
  • Yeast ubiquitin hydrolase

EC 2.7.7.50: mRNA guanylyltransferase

Reaction catalysed:
GTP + a 5'-diphospho-[mRNA] = diphosphate + a 5'-(5'-triphosphoguanosine)-[mRNA]
Systematic name:
GTP:mRNA guanylyltransferase
Alternative Name(s):
  • GTP--RNA guanylyltransferase
  • Messenger RNA guanylyltransferase
  • Protein lambda-2
  • mRNA capping enzyme

GO terms

Biochemical function:
Biological process:
Cellular component:
  • not assigned

Sequence family

Pfam Protein family (Pfam)
PF05409
Domain description: Coronavirus endopeptidase C30
Occurring in:
  1. 3C-like proteinase nsp5
The deposited structure of PDB entry 2ynb contains 2 copies of Pfam domain PF05409 (Coronavirus endopeptidase C30) in 3C-like proteinase nsp5. Showing 1 copy in chain A.

InterPro InterPro annotations
IPR008740
Domain description: Peptidase C30, coronavirus
Occurring in:
  1. 3C-like proteinase nsp5
IPR043504
Domain description: Peptidase S1, PA clan, chymotrypsin-like fold
Occurring in:
  1. 3C-like proteinase nsp5
IPR043477
Domain description: Peptidase C30, domain 3, coronavirus
Occurring in:
  1. 3C-like proteinase nsp5
IPR009003
Domain description: Peptidase S1, PA clan
Occurring in:
  1. 3C-like proteinase nsp5

Structure domains

CATH CATH domains
2.40.10.10
Class: Mainly Beta
Architecture: Beta Barrel
Topology: Thrombin, subunit H
Homology: Trypsin-like serine proteases
Occurring in:
  1. 3C-like proteinase nsp5
The deposited structure of PDB entry 2ynb contains 4 copies of CATH domain 2.40.10.10 (Thrombin, subunit H) in 3C-like proteinase nsp5. Showing 2 copies in chain A.
1.10.1840.10
Class: Mainly Alpha
Architecture: Orthogonal Bundle
Topology: main proteinase (3clpro) structure, domain 3
Homology: main proteinase (3clpro) structure, domain 3
Occurring in:
  1. 3C-like proteinase nsp5
The deposited structure of PDB entry 2ynb contains 2 copies of CATH domain 1.10.1840.10 (main proteinase (3clpro) structure, domain 3) in 3C-like proteinase nsp5. Showing 1 copy in chain A.