Target type: molecularfunction
Catalysis of the hydroxylation of C-24 of 1-alpha,25-hydroxycholecalciferol (25-hydroxyvitamin D3; calcitriol). [PMID:8506296]
1-alpha,25-dihydroxyvitamin D3 24-hydroxylase activity catalyzes the hydroxylation of 1-alpha,25-dihydroxyvitamin D3 (calcitriol) at the C24 position, producing 24,25-dihydroxyvitamin D3. This enzyme plays a crucial role in the regulation of vitamin D metabolism. The hydroxylation reaction occurs at the C24 position of calcitriol, which is a step in the catabolic pathway of vitamin D. This reaction converts the active form of vitamin D, calcitriol, into a less active form. The 24-hydroxylation process contributes to the regulation of vitamin D levels in the body and helps to maintain calcium homeostasis. The enzyme is primarily expressed in the kidneys, but it is also found in other tissues such as the liver, intestine, and bone. Its activity is regulated by various factors, including the concentration of vitamin D metabolites, parathyroid hormone, and other hormones.'
"
| Protein | Definition | Taxonomy |
|---|---|---|
| 1,25-dihydroxyvitamin D(3) 24-hydroxylase, mitochondrial | A 1,25-dihydroxyvitamin D(3) 24-hydroxylase, mitochondrial that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q07973] | Homo sapiens (human) |
| 1,25-dihydroxyvitamin D(3) 24-hydroxylase, mitochondrial | A 1,25-dihydroxyvitamin D(3) 24-hydroxylase, mitochondrial that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q07973] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| ketoconazole | 1-acetyl-4-(4-{[2-(2,4-dichlorophenyl)-2-(1H-imidazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy}phenyl)piperazine : A dioxolane that is 1,3-dioxolane which is substituted at positions 2, 2, and 4 by imidazol-1-ylmethyl, 2,4-dichlorophenyl, and [para-(4-acetylpiperazin-1-yl)phenoxy]methyl groups, respectively. | dichlorobenzene; dioxolane; ether; imidazoles; N-acylpiperazine; N-arylpiperazine | |
| liarozole | liarozole: inhibits all-trans-retinoic acid 4-hydroxylase; effective against hormone-dependent and hormone-independent tumors; R 75251 is chlorohydrate of R 61405; a potent inhibitor of retinoic acid metabolism; USAN name - liarozole fumarate | benzimidazoles | |
| ketoconazole | (2R,4S)-ketoconazole : A cis-1-acetyl-4-(4-{[2-(2,4-dichlorophenyl)-2-(1H-imidazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy}phenyl)piperazine which dioxolane moiety has (2R,4S)-configuration. | cis-1-acetyl-4-(4-{[2-(2,4-dichlorophenyl)-2-(1H-imidazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy}phenyl)piperazine | |
| calcitriol | dihydroxy-vitamin D3: as a major in vitro metabolite of 1alpha,25-dihydroxyvitamin D3, produced in primary cultures of neonatal human keratinocytes | D3 vitamins; hydroxycalciol; triol | antineoplastic agent; antipsoriatic; bone density conservation agent; calcium channel agonist; calcium channel modulator; hormone; human metabolite; immunomodulator; metabolite; mouse metabolite; nutraceutical |