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Literature summary extracted from
- Selenium-containing xanthine dehydrogenase from Eubacterium barkeri (1999), Eur. J. Biochem., 264, 862-871.
Inhibitors
| EC Number | Inhibitors | Comment | Organism | Structure |
|---|---|---|---|---|
| 1.17.1.4 | 4-hydroxypyrazolo(3,4-d)pyrimidine | 95% inhibition of hypoxanthine-NADP+-activity at 1 mM; i.e. allopurinol | Eubacterium barkeri |  |
| 1.17.1.4 | 6-Mercaptopurine | 90% inhibition of hypoxanthine-NADP+-activity at 1 mM | Eubacterium barkeri | |
| 1.17.1.4 | adenine | 96% inhibition of hypoxanthine-NADP+-activity at 1 mM | Eubacterium barkeri | |
| 1.17.1.4 | arsenite | 50% inhibition of hypoxanthine-NADP+-activity at 1 mM | Eubacterium barkeri | |
| 1.17.1.4 | KCN | addition of selenide in the presence of dithionite reactivates the inhibited enzyme | Eubacterium barkeri | |
| 1.17.1.4 | Sodium dithionite | reduction of enzyme | Eubacterium barkeri | |
KM Value [mM]
| EC Number | KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|---|
| 1.17.1.4 | 0.038 | - |
NADP+ | electron donor: hypoxanthine | Eubacterium barkeri | |
| 1.17.1.4 | 0.067 | - |
xanthine | electron acceptor: NADP+ | Eubacterium barkeri | |
| 1.17.1.4 | 0.21 | - |
hypoxanthine | electron acceptor: NADP+ | Eubacterium barkeri | |
Metals/Ions
| EC Number | Metals/Ions | Comment | Organism | Structure |
|---|---|---|---|---|
| 1.17.1.4 | Iron-sulfur-center | 2 Fe2-S2-clusters | Eubacterium barkeri | |
| 1.17.1.4 | molybdenum-center | - |
Eubacterium barkeri | |
| 1.17.1.4 | Se | 3.4 g-atom per mol enzyme | Eubacterium barkeri | |
| 1.17.1.4 | Tungsten | 3.4 g-atom per mol of enzyme | Eubacterium barkeri | |
Molecular Weight [Da]
| EC Number | Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
|---|---|---|---|---|
| 1.17.1.4 | 17500 | - |
tetramer of alpha/beta/gamma-protomers, alpha4, 4 * 81300 + beta4, 4 * 30000 + gamma4, 4 * 17500, SDS-PAGE | Eubacterium barkeri |
| 1.17.1.4 | 30000 | - |
tetramer of alpha/beta/gamma-protomers, alpha4, 4 * 81300 + beta4, 4 * 30000 + gamma4, 4 * 17500, SDS-PAGE | Eubacterium barkeri |
| 1.17.1.4 | 81300 | - |
tetramer of alpha/beta/gamma-protomers, alpha4, 4 * 81300 + beta4, 4 * 30000 + gamma4, 4 * 17500, SDS-PAGE | Eubacterium barkeri |
| 1.17.1.4 | 530000 | - |
gel filtration | Eubacterium barkeri |
Natural Substrates/ Products (Substrates)
| EC Number | Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 1.17.1.4 | hypoxanthine + NADP+ + H2O | Eubacterium barkeri | strict specificity for NADP+ | xanthine + NADPH | - |
? | |
| 1.17.1.4 | NADPH + O2 | Eubacterium barkeri | high NADPH oxidase activity | NADP+ + O2- + H+ | - |
? | |
| 1.17.1.4 | purine + NADP+ + H2O | Eubacterium barkeri | 60% of the activity compared to hypoxanthine | ? + NADPH | - |
? | |
| 1.17.1.4 | xanthine + NADP+ + H2O | Eubacterium barkeri | strict specificity for NADP+ | urate + NADPH | - |
? | |
Organism
| EC Number | Organism | UniProt | Comment | Textmining |
|---|---|---|---|---|
| 1.17.1.4 | Eubacterium barkeri | - |
- |
- |
Purification (Commentary)
| EC Number | Purification (Comment) | Organism |
|---|---|---|
| 1.17.1.4 | to homogeneity, chromatography techniques | Eubacterium barkeri |
Source Tissue
| EC Number | Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|---|
| 1.17.1.4 | cell culture | inducible by xanthine, selenite and molybdate | Eubacterium barkeri | - |
Specific Activity [micromol/min/mg]
| EC Number | Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
|---|---|---|---|---|
| 1.17.1.4 | 164 | - |
hypoxanthine-NADP+-assay | Eubacterium barkeri |
Substrates and Products (Substrate)
| EC Number | Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 1.17.1.4 | 4-aminoimidazole-5-carboxamide + NADP+ + H2O | 38% of the activity compared to hypoxanthine-NADP+ | Eubacterium barkeri | ? + NADPH | - |
? | |
| 1.17.1.4 | hypoxanthine + NADP+ + H2O | strict specificity for NADP+ | Eubacterium barkeri | xanthine + NADPH | - |
? | |
| 1.17.1.4 | N-methylnicontinamide + NADP+ + H2O | low activity, only a substrate at pH values above 8.0 | Eubacterium barkeri | ? + NADPH | - |
? | |
| 1.17.1.4 | NADPH + electron acceptor + H2O | electron acceptors: 2,6-dichlorophenolindophenol, methyl viologen, benzyl viologen, methylene blue | Eubacterium barkeri | NADP+ + reduced electron acceptor | - |
? | |
| 1.17.1.4 | NADPH + O2 | high NADPH oxidase activity | Eubacterium barkeri | NADP+ + O2- + H+ | - |
? | |
| 1.17.1.4 | purine + NADP+ + H2O | 60% of the activity compared to hypoxanthine | Eubacterium barkeri | ? + NADPH | - |
? | |
| 1.17.1.4 | xanthine + NADP+ + H2O | strict specificity for NADP+ | Eubacterium barkeri | urate + NADPH | - |
? | |
Subunits
| EC Number | Subunits | Comment | Organism |
|---|---|---|---|
| 1.17.1.4 | dodecamer | tetramer of alpha/beta/gamma-protomers, alpha4, 4 * 81300 + beta4, 4 * 30000 + gamma4, 4 * 17500, SDS-PAGE | Eubacterium barkeri |
Cofactor
| EC Number | Cofactor | Comment | Organism | Structure |
|---|---|---|---|---|
| 1.17.1.4 | FAD | - |
Eubacterium barkeri | |
| 1.17.1.4 | additional information | molybdoironflavoprotein: 17.5 mol iron, 18.4 mol acid-labile sulfur, 2.3 mol molybdenum, 1.1 mol tungsten, 0.95 mol selenium | Eubacterium barkeri |
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