5c8t

X-ray diffraction
3.2Å resolution

Crystal structure of the SARS coronavirus nsp14-nsp10 complex with functional ligand SAM

Released:

Function and Biology Details

Reactions catalysed:
S-adenosyl-L-methionine + a 5'-(5'-triphosphoguanosine)-[mRNA] = S-adenosyl-L-homocysteine + a 5'-(N(7)-methyl 5'-triphosphoguanosine)-[mRNA]
S-adenosyl-L-methionine + a 5'-(N(7)-methyl 5'-triphosphoguanosine)-(ribonucleotide)-[mRNA] = S-adenosyl-L-homocysteine + a 5'-(N(7)-methyl 5'-triphosphoguanosine)-(2'-O-methyl-ribonucleotide)-[mRNA]
Nucleoside triphosphate + RNA(n) = diphosphate + RNA(n+1)
GTP + a 5'-diphospho-[mRNA] = diphosphate + a 5'-(5'-triphosphoguanosine)-[mRNA]
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).
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.
ATP + H(2)O = ADP + phosphate
Biochemical function:
Biological process:
Cellular component:
  • not assigned

Structure analysis Details

Assembly composition:
hetero dimer (preferred)
PDBe Complex ID:
PDB-CPX-143102 (preferred)
Entry contents:
2 distinct polypeptide molecules
Macromolecules (2 distinct):
Non-structural protein 10 Chains: A, C
Molecule details ›
Chains: A, C
Length: 144 amino acids
Theoretical weight: 15.27 KDa
Source organism: Severe acute respiratory syndrome-related coronavirus
Expression system: Escherichia coli
UniProt:
  • Canonical: P0C6X7 (Residues: 4231-4369; Coverage: 2%)
Gene names: 1a-1b, rep
Sequence domains: Coronavirus RNA synthesis protein NSP10
Guanine-N7 methyltransferase nsp14 Chains: B, D
Molecule details ›
Chains: B, D
Length: 528 amino acids
Theoretical weight: 60.1 KDa
Source organism: Severe acute respiratory syndrome-related coronavirus
Expression system: Escherichia coli
UniProt:
  • Canonical: P0C6X7 (Residues: 5903-6429; Coverage: 8%)
Gene names: 1a-1b, rep
Sequence domains: Coronavirus proofreading exoribonuclease

Ligands and Environments


Cofactor: Ligand SAM 2 x SAM
2 bound ligands:
No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: SSRF BEAMLINE BL17U
Spacegroup: C2221
Unit cell:
a: 188.797Å b: 196.84Å c: 180.1Å
α: 90° β: 90° γ: 90°
R-values:
R R work R free
0.244 0.243 0.265
Expression system: Escherichia coli