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Literature summary for 1.8.5.4 extracted from

  • Nuebel, T.; Klughammer, C.; Huber, R.; Hauska, G.; Schuetz, M.
    Sulfide:quinone oxidoreductase in membranes of the hyperthermophilic bacterium Aquifex aeolicus (VF5) (2000), Arch. Microbiol., 173, 233-244.
    View publication on PubMed

Inhibitors

Inhibitors Comment Organism Structure
2-heptylquinolin-4-ol 1-oxide
-
Aquifex aeolicus
2-n-nonyl-4-hydroxyquinoline-N-oxide
-
Aquifex aeolicus
antimycin A
-
Aquifex aeolicus
aurachin C
-
Aquifex aeolicus
additional information insensitive towards cyanide Aquifex aeolicus
myxothiazole
-
Aquifex aeolicus
Stigmatellin
-
Aquifex aeolicus

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.005
-
decylubiquinone in 50 mM Bis-Tris (pH 7.0), at 20°C Aquifex aeolicus
0.011
-
Sulfide in 50 mM Bis-Tris (pH 7.0), at 20°C Aquifex aeolicus

Localization

Localization Comment Organism GeneOntology No. Textmining
membrane
-
Aquifex aeolicus 16020
-

Organism

Organism UniProt Comment Textmining
Aquifex aeolicus
-
-
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
3.5
-
in 50 mM Bis-Tris (pH 7.0), at 20°C Aquifex aeolicus

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
sulfide + decylubiquinone
-
Aquifex aeolicus sulfur + decylubiquinol
-
?

Synonyms

Synonyms Comment Organism
SQR
-
Aquifex aeolicus
sulfide:quinone oxidoreductase
-
Aquifex aeolicus

Temperature Range [°C]

Temperature Minimum [°C] Temperature Maximum [°C] Comment Organism
20 70 with 0.015 mM decylubqiuinone reduced/mg protein/min, the activity at 70°C is 5fold higher than the activity at 20°C Aquifex aeolicus

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
95
-
the reaction with membranes that have been heated for more than 2 h at 95°C is negligible Aquifex aeolicus

Cofactor

Cofactor Comment Organism Structure
FAD
-
Aquifex aeolicus

IC50 Value

IC50 Value IC50 Value Maximum Comment Organism Inhibitor Structure
0.000014
-
in 50 mM Bis-Tris (pH 7.0), at 20°C Aquifex aeolicus aurachin C
0.006
-
in 50 mM Bis-Tris (pH 7.0), at 20°C Aquifex aeolicus 2-n-nonyl-4-hydroxyquinoline-N-oxide
0.01
-
in 50 mM Bis-Tris (pH 7.0), at 20°C Aquifex aeolicus antimycin A
0.012
-
in 50 mM Bis-Tris (pH 7.0), at 20°C Aquifex aeolicus 2-heptylquinolin-4-ol 1-oxide
0.02
-
in 50 mM Bis-Tris (pH 7.0), at 20°C Aquifex aeolicus Stigmatellin
0.043
-
in 50 mM Bis-Tris (pH 7.0), at 20°C Aquifex aeolicus myxothiazole

General Information

General Information Comment Organism
physiological function SQR and the cytochrome bc complex are involved in sulfide-dependent respiration. Oxidation of sulfide by SQR is coupled, at least in part, to the proton-motive Q-cycle mechanism Aquifex aeolicus