PDBe 3h8i

X-ray diffraction
2.65Å resolution

The first X-ray structure of a sulfide:quinone oxidoreductase: Insights into sulfide oxidation mechanism


Function and Biology Details

Reaction catalysed:
n sulfide + n quinone = polysulfide + n quinol
Biochemical function:
Biological process:
Cellular component:

Structure analysis Details

Assembly composition:
homo dimer (preferred)
Entry contents:
1 distinct polypeptide molecule
Sulfide-quinone reductase Chains: A, B
Molecule details ›
Chains: A, B
Length: 409 amino acids
Theoretical weight: 45.17 KDa
Source organism: Acidianus ambivalens
  • Canonical: Q7ZAG8 (Residues: 1-409; Coverage: 100%)
Gene names: noxA, sqr
Sequence domains: Pyridine nucleotide-disulphide oxidoreductase
Structure domains: FAD/NAD(P)-binding domain

Ligands and Environments

3 bound ligands:

No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: ESRF BEAMLINE ID14-1
Spacegroup: P6522
Unit cell:
a: 178.55Å b: 178.55Å c: 162.31Å
α: 90° β: 90° γ: 120°
R R work R free
0.197 0.196 0.225