Protein Variants | Comment | Organism |
---|---|---|
T306A | site-directed mutagenesis, the mutant shows highly reduced hydroxylation activity compared to the wild-type enzyme. due to a high degree of uncoupling in which reducing equivalents and protons are funneled into non-productive pathways. The catalysis of carbon-carbon bond scission by the T306A mutant is largely unimpeded by disruption of the CYP17A1 acid-alcohol pair | Homo sapiens |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
additional information | Homo sapiens | the multifunctional enzyme catalyzes the 17alpha-hydroxylation of DELTA4- and DELTA5-steroids progesterone and pregnenolone to form the corresponding 17alpha-hydroxy products through its hydroxylase activity, and a subsequent 17,20-carbon-carbon scission of pregnene-side chain produce the androgens androstenedione and dehydroepiandrosterone | ? | - |
? | |
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2 | Homo sapiens | - |
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O | - |
? | |
progesterone + [reduced NADPH-hemoprotein reductase] + O2 | Homo sapiens | - |
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Homo sapiens | P05093 | - |
- |
Reaction | Comment | Organism | Reaction ID |
---|---|---|---|
a C21-steroid + [reduced NADPH-hemoprotein reductase] + O2 = a 17alpha-hydroxy-C21-steroid + [oxidized NADPH-hemoprotein reductase] + H2O | the hydroxylation reaction is believed to proceed through a conventional Compound I rebound mechanism. Thr306 is a member of the conserved acid/alcohol pair essential for the efficient delivery of protons required for hydroperoxoanion heterolysis and formation of Compound I in the cytochromes P450. Involvement of a nucleophilic peroxo-anion rather than the traditional Compound I in catalysis. The peroxoanion is required to initiate O-O bond scission and formation of the Cpd I reactive intermediate | Homo sapiens |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
additional information | the multifunctional enzyme catalyzes the 17alpha-hydroxylation of DELTA4- and DELTA5-steroids progesterone and pregnenolone to form the corresponding 17alpha-hydroxy products through its hydroxylase activity, and a subsequent 17,20-carbon-carbon scission of pregnene-side chain produce the androgens androstenedione and dehydroepiandrosterone | Homo sapiens | ? | - |
? | |
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2 | - |
Homo sapiens | 17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O | - |
? | |
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2 | via Compound I intermediate | Homo sapiens | 17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O | - |
? | |
progesterone + [reduced NADPH-hemoprotein reductase] + O2 | - |
Homo sapiens | 17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O | - |
? | |
progesterone + [reduced NADPH-hemoprotein reductase] + O2 | via Compound I intermediate | Homo sapiens | 17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O | - |
? |
Synonyms | Comment | Organism |
---|---|---|
CYP17A1 | - |
Homo sapiens |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
37 | - |
assay at | Homo sapiens |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
7.4 | - |
assay at | Homo sapiens |
General Information | Comment | Organism |
---|---|---|
metabolism | cytochrome P450 CYP17A1 catalyzes a series of reactions that lie at the intersection of corticoid and androgen biosynthesis and thus occupies an essential role in steroid hormone metabolism | Homo sapiens |