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Literature summary extracted from
- Substrate-binding region of cytochrome P-450scc (P-450 XIA1). Identification and primary structure of the cholesterol binding region in cytochrome P-450scc (1993), Biochim. Biophys. Acta, 1161, 124-130.
Protein Variants
| EC Number | Protein Variants | Comment | Organism |
|---|---|---|---|
| 1.14.15.6 | K267Q | participation in electrostatic interaction of P-450scc with adrenodoxin | Bos taurus |
| 1.14.15.6 | K403Q | participation in electrostatic interaction of P-450scc with adrenodoxin | Bos taurus |
| 1.14.15.6 | K405Q | participation in electrostatic interaction of P-450scc with adrenodoxin | Bos taurus |
| 1.14.15.6 | R426Q | participation in electrostatic interaction of P-450scc with adrenodoxin | Bos taurus |
Inhibitors
| EC Number | Inhibitors | Comment | Organism | Structure |
|---|---|---|---|---|
| 1.14.15.6 | methoxychlor | pesticide of DDT, suicide inhibitor, competitive to cholesterol, substantial irreversible loss of activity, 5% inhibition within 5 min at 0.2 mM, decrease is suppressed by the presence of cholesterol | Bos taurus |  |
| 1.14.15.6 | additional information | inactivation different in absence and presence of cholesterol, protective effect of cholesterol as well as 20alpha-hydroxycholesterol and deoxycorticosterone against inactivation by methoxychlor | Bos taurus |
KM Value [mM]
| EC Number | KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|---|
| 1.14.15.6 | 0.164 | - |
cholesterol | - |
Bos taurus | |
Localization
| EC Number | Localization | Comment | Organism | GeneOntology No. | Textmining |
|---|---|---|---|---|---|
| 1.14.15.6 | mitochondrial inner membrane | - |
Bos taurus | 5743 | - |
Natural Substrates/ Products (Substrates)
| EC Number | Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 1.14.15.6 | cholesterol + 6 reduced adrenodoxin + 3 O2 | Bos taurus | - |
pregnenolone + 4-methylpentanal + 6 oxidized adrenodoxin + 4 H2O | precursor of all steroid hormones | ? | |
Organism
| EC Number | Organism | UniProt | Comment | Textmining |
|---|---|---|---|---|
| 1.14.15.6 | Bos taurus | - |
- |
- |
Source Tissue
| EC Number | Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|---|
| 1.14.15.6 | adrenal cortex | - |
Bos taurus | - |
Substrates and Products (Substrate)
| EC Number | Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 1.14.15.6 | cholesterol + 6 reduced adrenodoxin + 3 O2 | - |
Bos taurus | pregnenolone + 4-methylpentanal + 6 oxidized adrenodoxin + 4 H2O | precursor of all steroid hormones | ? | |
| 1.14.15.6 | cholesterol + reduced adrenodoxin + O2 | - |
Bos taurus | pregnenolone + 4-methylpentanal + oxidized adrenodoxin + H2O | - |
? | |
| 1.14.15.6 | additional information | 21 amino-acid residues from Pro-8 to Arg-28 in the amino-terminus are located in or near the cholesterol-binding site, this site is in a quite different region from the adreno-ferredoxin binding site Pro374 to Iso-389 | Bos taurus | ? | - |
? | |
Temperature Optimum [°C]
| EC Number | Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|---|
| 1.14.15.6 | 37 | - |
assay at | Bos taurus |
pH Optimum
| EC Number | pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|---|
| 1.14.15.6 | 7.2 | - |
assay at | Bos taurus |
Cofactor
| EC Number | Cofactor | Comment | Organism | Structure |
|---|---|---|---|---|
| 1.14.15.6 | adrenodoxin | - |
Bos taurus | |
| 1.14.15.6 | heme | hemeprotein | Bos taurus | |
| 1.14.15.6 | heme | content of 18.9 nmol/mg protein | Bos taurus | |
| 1.14.15.6 | NADPH | NADPH-linked adrenodoxin reductase | Bos taurus | |
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