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Literature summary for 3.12.1.B1 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

Activating Compound Comment Organism Structure
ammonium sulfate 1 M, optimal concentration for stimulation Acidiphilium acidophilum

Inhibitors

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

KM Value [mM]

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

Localization

Localization Comment Organism GeneOntology No. Textmining
soluble
-
Acidiphilium acidophilum
-
-

Organism

Organism UniProt Comment Textmining
Acidiphilium acidophilum
-
-
-

Purification (Commentary)

Purification (Comment) Organism
high salt concentrations are needed to release enzyme activity during cell disruption Acidiphilium acidophilum

Storage Stability

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

Substrates and Products (Substrate)

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

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
40
-
-
Acidiphilium acidophilum

Temperature Stability [°C]

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

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
3
-
-
Acidiphilium acidophilum

pH Range

pH Minimum pH Maximum Comment Organism
2
-
about 50% of maximum activity Acidiphilium acidophilum
6
-
no residual activity Acidiphilium acidophilum