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Record Information
Version3.6
Creation Date2005-11-16 15:48:42 UTC
Update Date2013-05-29 19:25:59 UTC
HMDB IDHMDB00363
Secondary Accession NumbersNone
Metabolite Identification
Common Name17a-Hydroxypregnenolone
Description17a-Hydroxypregnenolone is a 21-carbon steroid that is converted from pregnenolone by cytochrome P450 17alpha hydroxylase/C17,20 lyase (CYP17, EC 1.14.99.9). 17a-Hydroxypregnenolone is an intermediate in the delta-5 pathway of biosynthesis of gonadal steroid hormones and the adrenal corticosteroids. The first, rate-limiting and hormonally regulated step in the biosynthesis of all steroid hormones is the conversion of cholesterol to pregnenolone. The conversion of cholesterol to pregnenolone is accomplished by the cleavage of the cholesterol side chain, catalyzed by a mitochondrial cytochrome P450 enzyme termed P450scc where scc designates Side Chain Cleavage. All steroid hormones are made from the pregnenolone produced by P450scc; thus, the presence or absence of each of the activities of CYP17 directs this pregnenolone towards its final metabolic pathway. While all cytochrome P450 enzymes can catalyze multiple reactions on a single active site, CYP17 is the only one described to date in which these multiple activities are differentially regulated by a physiologic process. 17a-Hydroxypregnenolone is converted to dehydroepiandrosterone by the 17,20 lyase activity of CYP17. The ratio of the 17,20 lyase to 17 alpha-hydroxylase activity of CYP17 determines the ratio of C21 to C19 steroids produced. This ratio is regulated post-translationally by at least three factors: the abundance of the electron-donating protein P450 oxidoreductase, the presence of cytochrome b5, and the serine phosphorylation of CYP17. (PMID: 12573809 ).
Structure
Thumb
Synonyms
  1. 17-Hydroxy-D5-pregnenolone
  2. 17-Hydroxypregnenolone
  3. 17-OH-pregnenolone
  4. 17a-Hydroxypregnolone
  5. 17alpha-Hydroxypregnanolone
  6. 17alpha-hydroxypregnenolone
  7. 3b,17-Dihydroxy-5-pregnen-20-one
  8. 3b,17-Dihydroxy-Pregn-5-en-20-one
  9. 3b,17a-Dihydroxypregn-5-en-20-one
  10. 5-Pregnen-3b,17a-diol-20-one
Chemical FormulaC21H32O3
Average Molecular Weight332.477
Monoisotopic Molecular Weight332.23514489
IUPAC Name1-[(1S,2R,5S,10R,11S,14R,15S)-5,14-dihydroxy-2,15-dimethyltetracyclo[8.7.0.0^{2,7}.0^{11,15}]heptadec-7-en-14-yl]ethan-1-one
Traditional IUPAC Name17-hydroxypregnenolone
CAS Registry Number387-79-1
SMILES
[H][C@@]12CC[C@](O)(C(C)=O)[C@@]1(C)CC[C@@]1([H])[C@@]2([H])CC=C2C[C@@H](O)CC[C@]12C
InChI Identifier
InChI=1S/C21H32O3/c1-13(22)21(24)11-8-18-16-5-4-14-12-15(23)6-9-19(14,2)17(16)7-10-20(18,21)3/h4,15-18,23-24H,5-12H2,1-3H3/t15-,16+,17-,18-,19-,20-,21-/m0/s1
InChI KeyJERGUCIJOXJXHF-TVWVXWENSA-N
Chemical Taxonomy
KingdomOrganic Compounds
Super ClassLipids
ClassSteroids and Steroid Derivatives
Sub ClassGluco/mineralocorticoids, Progestogins and Derivatives
Other Descriptors
  • 17alpha-hydroxy steroid(ChEBI)
  • 3beta-hydroxy steroid(ChEBI)
  • Aliphatic Homopolycyclic Compounds
  • C21 steroids (gluco/mineralocorticoids, progestogins) and derivatives(Lipidmaps)
  • hydroxypregnenolone(ChEBI)
Substituents
  • 20 Keto Steroid
  • 3 Hydroxy Steroid
  • Bicyclohexane
  • Cyclic Alcohol
  • Cyclohexane
  • Cyclohexene
  • Ketone
  • Secondary Alcohol
  • Tertiary Alcohol
Direct ParentGluco/mineralocorticoids, Progestogins and Derivatives
Ontology
StatusDetected and Quantified
Origin
  • Endogenous
  • Food
Biofunction
  • Cell signaling
  • Fuel and energy storage
  • Fuel or energy source
  • Hormones, Membrane component
  • Membrane integrity/stability
Application
  • Nutrients
  • Stabilizers
  • Surfactants and Emulsifiers
Cellular locations
  • Cytoplasm
  • Extracellular
  • Membrane (predicted from logP)
  • Endoplasmic reticulum
Physical Properties
StateSolid
Experimental Properties
PropertyValueReference
Melting Point266 - 271 °CNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
PropertyValueSource
water solubility0.038 g/LALOGPS
logP3.15ALOGPS
logP2.83ChemAxon
logS-4ALOGPS
pKa (strongest acidic)12.7ChemAxon
pKa (strongest basic)-1.4ChemAxon
physiological charge0ChemAxon
hydrogen acceptor count3ChemAxon
hydrogen donor count2ChemAxon
polar surface area57.53ChemAxon
rotatable bond count1ChemAxon
refractivity95.16ChemAxon
polarizability38.75ChemAxon
Spectra
SpectraGC-MSMS/MS1D NMR2D NMR
Biological Properties
Cellular Locations
  • Cytoplasm
  • Extracellular
  • Membrane (predicted from logP)
  • Endoplasmic reticulum
Biofluid Locations
  • Blood
Tissue Location
  • Adrenal Cortex
  • Testes
Pathways
NameSMPDB LinkKEGG Link
Androgen and Estrogen MetabolismSMP00068map00150
SteroidogenesisSMP00130map00140
Normal Concentrations
BiofluidStatusValueAgeSexConditionReferenceDetails
BloodDetected and Quantified0.003 (0.000 - 0.006) uMAdult (>18 years old)FemaleNormal details
BloodDetected and Quantified0.006 (0.001-0.012) uMAdult (>18 years old)MaleNormal details
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDNot Available
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite IDNot Available
FoodDB IDFDB021982
KNApSAcK IDNot Available
Chemspider ID82579
KEGG Compound IDC05138
BioCyc IDNot Available
BiGG ID45199
Wikipedia Link17-Hydroxypregnenolone
NuGOwiki LinkHMDB00363
Metagene LinkHMDB00363
METLIN ID5352
PubChem Compound91451
PDB IDNot Available
ChEBI ID28750
References
Synthesis ReferenceKaspar, Emanuel; Hiersemann, Wolfgang; Schenck, Martin. Preparation from their esters of steroid alcohols that are sensitive to acids and alkali. (1958), DE 1028572 19580424 CAN 54:74845 AN 1960:74845 CAPLUS
Material Safety Data Sheet (MSDS)Download (PDF)
General References
  1. Shimozawa K, Saisho S, Yata J, Kambegawa A: Age-related changes in serum 17-hydroxypregnenolone and 17-hydroxypregnenolone sulfate concentrations in human infancy and childhood. Endocrinol Jpn. 1988 Apr;35(2):189-95. Pubmed: 3208699
  2. Rodriguez-Rigau LJ, Weiss DB, Smith KD, Steinberger E: Suggestion of abnormal testicular steroidogenesis in some oligospermic men. Acta Endocrinol (Copenh). 1978 Feb;87(2):400-12. Pubmed: 580138
  3. Kaufman FR, Costin G, Goebelsmann U, Stanczyk FZ, Zachmann M: Male pseudohermaphroditism due to 17,20-desmolase deficiency. J Clin Endocrinol Metab. 1983 Jul;57(1):32-6. Pubmed: 6853680
  4. Miller WL: Androgen biosynthesis from cholesterol to DHEA. Mol Cell Endocrinol. 2002 Dec 30;198(1-2):7-14. Pubmed: 12573809

Enzymes

General function:
Involved in monooxygenase activity
Specific function:
Catalyzes the side-chain cleavage reaction of cholesterol to pregnenolone.
Gene Name:
CYP11A1
Uniprot ID:
P05108
Molecular weight:
60101.87
Reactions
17a,20a-Dihydroxycholesterol + Oxygen + Hydrogen Ion + Reduced adrenal ferredoxin → 17a-Hydroxypregnenolone + 4-Methylpentanal + Water + Oxidized adrenal ferredoxindetails
General function:
Involved in monooxygenase activity
Specific function:
Conversion of pregnenolone and progesterone to their 17-alpha-hydroxylated products and subsequently to dehydroepiandrosterone (DHEA) and androstenedione. Catalyzes both the 17-alpha-hydroxylation and the 17,20-lyase reaction. Involved in sexual development during fetal life and at puberty.
Gene Name:
CYP17A1
Uniprot ID:
P05093
Molecular weight:
57369.995
Reactions
Pregnenolone + Reduced acceptor + Oxygen → 17a-Hydroxypregnenolone + Acceptor + Waterdetails
17a-Hydroxypregnenolone + Reduced acceptor + Oxygen → Dehydroepiandrosterone + Acetic acid + Acceptor + Waterdetails
General function:
Involved in 3-beta-hydroxy-delta5-steroid dehydrogenase activity
Specific function:
3-beta-HSD is a bifunctional enzyme, that catalyzes the oxidative conversion of Delta(5)-ene-3-beta-hydroxy steroid, and the oxidative conversion of ketosteroids. The 3-beta-HSD enzymatic system plays a crucial role in the biosynthesis of all classes of hormonal steroids. Efficiently catalyzes the transformation of pregnenolone to progesterone, 17-alpha-hydroxypregnenolone to 17-alpha-hydroxyprogesterone, DHEA to 4-androstenedione, dihydrotestosterone to 5-alpha-androstane-3 beta,17 beta-diol, dehydroepiandrosterone to androstenedione and 5-alpha-androstan-3 beta,17 beta-diol to 5-alpha-dihydrotestosterone.
Gene Name:
HSD3B1
Uniprot ID:
P14060
Molecular weight:
42251.25
Reactions
17a-Hydroxypregnenolone + NAD → 17-Hydroxyprogesterone + NADH + Hydrogen Iondetails
General function:
Involved in 3-beta-hydroxy-delta5-steroid dehydrogenase activity
Specific function:
3-beta-HSD is a bifunctional enzyme, that catalyzes the oxidative conversion of Delta(5)-ene-3-beta-hydroxy steroid, and the oxidative conversion of ketosteroids. The 3-beta-HSD enzymatic system plays a crucial role in the biosynthesis of all classes of hormonal steroids.
Gene Name:
HSD3B2
Uniprot ID:
P26439
Molecular weight:
42051.845
Reactions
17a-Hydroxypregnenolone + NAD → 17-Hydroxyprogesterone + NADH + Hydrogen Iondetails
General function:
Involved in monooxygenase activity
Specific function:
Not Available
Gene Name:
P450-CYP21B
Uniprot ID:
Q16874
Molecular weight:
56000.9
General function:
Involved in monooxygenase activity
Specific function:
Not Available
Gene Name:
CYP21A2
Uniprot ID:
Q08AG9
Molecular weight:
55972.9
General function:
Not Available
Specific function:
Specifically catalyzes the 21-hydroxylation of steroids. Required for the adrenal synthesis of mineralocorticoids and glucocorticoids.
Gene Name:
CYP21A2
Uniprot ID:
P08686
Molecular weight:
56000.94
Reactions
17a-Hydroxypregnenolone + NADPH + Hydrogen Ion + Oxygen → 17a,21-Dihydroxypreg-nenolone + NADP + Waterdetails