_EC 1.8.5.4 bacterial sulfide:quinone reductase. 20 PDB entries  
EC 1.-.-.- Oxidoreductases. [21,491 PDB entries]
EC 1.8.-.- Acting on a sulfur group of donors. [762 PDB entries]
EC 1.8.5.- With a quinone or similar compound as acceptor. [102 PDB entries]
EC 1.8.5.4 bacterial sulfide:quinone reductase. [20 PDB entries]
3h8i

Reaction: n a quinone + n hydrogen sulfide + n H(+) = polysulfur(n-2) + n a quinol.
 

n sulfide
 +
n quinone
 = polysulfide
 + n quinol
Molecule diagrams generated from .mol files obtained from the KEGG ftp site.

Other name(s): sulfide:quinone reductase.
Comments: Ubiquinone, plastoquinone or menaquinone can act as acceptor in different species. This enzyme catalyzes the formation of sulfur globules. It repeats the catalytic cycle without releasing the product, producing a polysulfide of up to 10 sulfur atoms. The reaction stops when the maximum length of the polysulfide that can be accommodated in the sulfide oxidation pocket is achieved. The enzyme also plays an important role in anoxygenic bacterial photosynthesis. cf. Ec 1.8.5.8.
Links:   [IntEnz]   [ExPASy]   [KEGG]  

There are 20 PDB entries in enzyme class E.C.1.8.5.4

  PDB code Protein
3h8i
The first x-ray structure of a sulfide:quinone oxidoreductase: insights into sulfide oxidation mechanism
Source: Acidianus ambivalens. Desulfurolobus ambivalens. Organism_taxid: 2283
Chains: A, B (356 residues) CATH domains: 3.50.50.60 3.50.50.60
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3h8l
The first x-ray structure of a sulfide:quinone oxidoreductase: insights into sulfide oxidation mechanism
Source: Acidianus ambivalens. Desulfurolobus ambivalens. Organism_taxid: 2283
Chains: A, B (356 residues) CATH domains: 3.50.50.60 3.50.50.60
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3hyv
3-d x-ray structure of the sulfide:quinone oxidoreductase from the hyperthermophilic bacterium aquifex aeolicus
Source: Aquifex aeolicus. Organism_taxid: 63363. Strain: vf5
Chains: A, B, C, D, E, F (429 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3hyw
3-d x-ray structure of the sulfide:quinone oxidoreductase of the hyperthermophilic bacterium aquifex aeolicus in complex with decylubiquinone
Source: Aquifex aeolicus. Organism_taxid: 63363. Strain: vf5
Chains: A, B, C, D, E, F (429 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3hyx
3-d x-ray structure of the sulfide:quinone oxidoreductase from aquifex aeolicus in complex with aurachin c
Source: Aquifex aeolicus. Organism_taxid: 63363. Strain: vf5
Chains: A, B, C, D, E, F (429 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3kpk
Crystal structure of sulfide:quinone oxidoreductase from acidithiobacillus ferrooxidans, c160a mutant
Source: Acidithiobacillus ferrooxidans atcc 23270. Ferrobacillus ferrooxidans (strain atcc 23270). Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562.
Chain: A (418 residues) CATH domain: 3.50.50.100
Bound ligands:   Het Group PGR is 44.44% similar to enzyme reactant quinone
  Het Group FAD corresponds to enzyme cofactor FAD
3sx6
Crystal structure of sulfide:quinone oxidoreductase cys356ala variant from acidithiobacillus ferrooxidans complexed with decylubiquinone
Source: Acidithiobacillus ferrooxidans atcc 23270. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3sxi
Crystal structure of sulfide:quinone oxidoreductase cys128ala variant from acidithiobacillus ferrooxidans complexed with decylubiquinone
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3sy4
Crystal structure of sulfide:quinone oxidoreductase ser126ala variant from acidithiobacillus ferrooxidans
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3syi
Crystal structure of sulfide:quinone oxidoreductase ser126ala variant from acidithiobacillus ferrooxidans using 7.0 kev diffraction data
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3sz0
Crystal structure of sulfide:quinone oxidoreductase from acidithiobacillus ferrooxidans in complex with sodium selenide
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3szc
Crystal structure of sulfide:quinone oxidoreductase from acidithiobacillus ferrooxidans in complex with gold (i) cyanide
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3szf
Crystal structure of sulfide:quinone oxidoreductase h198a variant from acidithiobacillus ferrooxidans in complex with bound trisulfide and decylubiquinone
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3szw
Crystal structure of sulfide:quinone oxidoreductase cys128ser variant from acidithiobacillus ferrooxidans in complex with decylubiquinone
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3t0k
Crystal structure of sulfide:quinone oxidoreductase from acidithiobacillus ferrooxidans with bound trisulfide and decylubiquinone
Source: Acidithiobacillus ferrooxidans atcc 23270. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3t14
Crystal structure of sulfide:quinone oxidoreductase cys128ala variant from acidithiobacillus ferrooxidans with bound disulfide
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3t2k
Crystal structure of sulfide:quinone oxidoreductase cys128ala variant from acidithiobacillus ferrooxidans with bound trisulfane
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3t2y
Crystal structure of sulfide:quinone oxidoreductase his132ala variant from acidithiobacillus ferrooxidans with bound disulfide
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 562
Chain: A (407 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD
3t2z
Crystal structure of sulfide:quinone oxidoreductase from acidithiobacillus ferrooxidans
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 469008
Chains: A, B (427 residues) CATH domain: 3.50.50.100
Bound ligands:   Het Group BU2 is 55.56% similar to enzyme reactant quinone
  Het Group FAD corresponds to enzyme cofactor FAD
3t31
Crystal structure of sulfide:quinone oxidoreductase from acidithiobacillus ferrooxidans in complex with decylubiquinone
Source: Acidithiobacillus ferrooxidans. Organism_taxid: 243159. Strain: atcc 23270 / dsm 14882 / ncib 8455. Gene: afe_1792. Expressed in: escherichia coli. Expression_system_taxid: 469008.
Chain: A (421 residues) CATH domain: 3.50.50.100
Bound ligand:   Het Group FAD corresponds to enzyme cofactor FAD