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Literature summary extracted from

  • Meulenberg, R.; Scheer, E.J.; Pronk, J.T.; Hazeu, W.; Bos, P.; Kuenen, J.G.
    Metabolism of tetrathionate in Thiobacillus acidophilus (1993), FEMS Microbiol. Lett., 112, 167-172.
No PubMed abstract available

Activating Compound

EC Number Activating Compound Comment Organism Structure
3.12.1.B1 ammonium sulfate 1 M, optimal concentration for stimulation Acidiphilium acidophilum

Inhibitors

EC Number Inhibitors Comment Organism Structure
3.12.1.B1 HgCl2 0.05 mM, complete loss of activity Acidiphilium acidophilum
3.12.1.B1 additional information not inhibitory: azide at 1 mM, N-ethylmaleimide at 0.05 mM Acidiphilium acidophilum
3.12.1.B1 thiosulfate product inhibition, 40% inhibition at 1 mM Acidiphilium acidophilum

KM Value [mM]

EC Number KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
3.12.1.B1 0.3
-
tetrathionate pH 3.0, 30°C Acidiphilium acidophilum

Localization

EC Number Localization Comment Organism GeneOntology No. Textmining
3.12.1.B1 soluble
-
Acidiphilium acidophilum
-
-

Organism

EC Number Organism UniProt Comment Textmining
3.12.1.B1 Acidiphilium acidophilum
-
-
-

Purification (Commentary)

EC Number Purification (Comment) Organism
3.12.1.B1 high salt concentrations are needed to release enzyme activity during cell disruption Acidiphilium acidophilum

Storage Stability

EC Number Storage Stability Organism
3.12.1.B1 -20°C, enzyme is not affected by freezing and thawing Acidiphilium acidophilum
3.12.1.B1 0°C, stable for one week Acidiphilium acidophilum

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
3.12.1.B1 additional information hydrolysis of trithionate, reaction of EC 3.12.1.1, and of tetrathionate are catalyzed by two different enzymes Acidiphilium acidophilum ?
-
?
3.12.1.B1 tetrathionate + H2O
-
Acidiphilium acidophilum sulfur + thiosulfate + sulfate + 2 H+ stoichiometric conversion of tetrathionate to thiosulfate, sulfur and two protons ?

Temperature Optimum [°C]

EC Number Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
3.12.1.B1 40
-
-
Acidiphilium acidophilum

Temperature Stability [°C]

EC Number Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
3.12.1.B1 30
-
100 h, complete loss of activity Acidiphilium acidophilum
3.12.1.B1 40
-
20 h, complete loss of activity Acidiphilium acidophilum

pH Optimum

EC Number pH Optimum Minimum pH Optimum Maximum Comment Organism
3.12.1.B1 3
-
-
Acidiphilium acidophilum

pH Range

EC Number pH Minimum pH Maximum Comment Organism
3.12.1.B1 2
-
about 50% of maximum activity Acidiphilium acidophilum
3.12.1.B1 6
-
no residual activity Acidiphilium acidophilum