3a,7a-Dihydroxycoprostanic acid
3a,7a-Dihydroxycoprostanic acid is a bile acid excreted in small amounts in the urine of healthy subjects (PMID 864325 ). 3a,7a-Dihydroxycoprostanic acid is the precursor to chenodeoxycholic acid. A bile acid. Bile acids are steroid acids found predominantly in bile of mammals. The distinction between different bile acids is minute, depends only on presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic moleclies derived from the catabolism of cholesterol. They modliate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regliation of all the key enzymes involved in cholesterol homeostasis. Bile acids recircliate through the liver, bile ducts, small intestine and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH and, consequently, require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g., membrane disruption) and there are a plethora of mechanisms to limit their accumliation in blood and tissues.
MOLSDF3D-SDFPDBSMILESInChI View 3D Structure
Structure for HMDB00359 (3a,7a-Dihydroxycoprostanic acid)
C27H46O4
434.6517
434.33960996
(6R)-6-[(1S,2S,5R,7S,9R,11S,14R,15R)-5,9-dihydroxy-2,15-dimethyltetracyclo[8.7.0.0²,⁷.0¹¹,¹⁵]heptadecan-14-yl]-2-methylheptanoic acid
(6R)-6-[(1S,2S,5R,7S,9R,11S,14R,15R)-5,9-dihydroxy-2,15-dimethyltetracyclo[8.7.0.0²,⁷.0¹¹,¹⁵]heptadecan-14-yl]-2-methylheptanoic acid
17974-66-2
[H][C@@]1(CC[C@@]2([H])C3[C@H](O)C[C@]4([H])C[C@H](O)CC[C@]4(C)[C@@]3([H])CC[C@]12C)[C@H](C)CCCC(C)C(O)=O
InChI=1S/C27H46O4/c1-16(6-5-7-17(2)25(30)31)20-8-9-21-24-22(11-13-27(20,21)4)26(3)12-10-19(28)14-18(26)15-23(24)29/h16-24,28-29H,5-15H2,1-4H3,(H,30,31)/t16-,17?,18+,19-,20-,21+,22+,23-,24?,26+,27-/m1/s1
ITZYGDKGRKKBSN-KLYSAGIUSA-N
Not classified
Expected but not Quantified
Solid
Not Available
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None
None
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FDB021979
Not Available
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HMDB00359
HMDB00359
5348
53477686
Not Available
Not Available
- Alme B, Bremmelgaard A, Sjovall J, Thomassen P: Analysis of metabolic profiles of bile acids in urine using a lipophilic anion exchanger and computerized gas-liquid chromatorgaphy-mass spectrometry. J Lipid Res. 1977 May;18(3):339-62. [PubMed:864325 ]
Enzymes
- General function:
- Involved in oxidoreductase activity
- Specific function:
- Not Available
- Gene Name:
- ALDH2
- Uniprot ID:
- P05091
- Molecular weight:
- 56380.93
- General function:
- Involved in thiolester hydrolase activity
- Specific function:
- Involved in bile acid metabolism. In liver hepatocytes catalyzes the second step in the conjugation of C24 bile acids (choloneates) to glycine and taurine before excretion into bile canaliculi. The major components of bile are cholic acid and chenodeoxycholic acid. In a first step the bile acids are converted to an acyl-CoA thioester, either in peroxisomes (primary bile acids deriving from the cholesterol pathway), or cytoplasmic at the endoplasmic reticulum (secondary bile acids). May catalyze the conjugation of primary or secondary bile acids, or both. The conjugation increases the detergent properties of bile acids in the intestine, which facilitates lipid and fat-soluble vitamin absorption. In turn, bile acids are deconjugated by bacteria in the intestine and are recycled back to the liver for reconjugation (secondary bile acids). May also act as an acyl-CoA thioesterase that regulates intracellular levels of free fatty acids. In vitro, catalyzes the hydrolysis of long- and very long-chain saturated acyl-CoAs to the free fatty acid and coenzyme A (CoASH), and conjugates glycine to these acyl-CoAs.
- Gene Name:
- BAAT
- Uniprot ID:
- Q14032
- Molecular weight:
- 46298.865
- General function:
- Involved in catalytic activity
- Specific function:
- Acyl-CoA synthetase involved in bile acid metabolism. Proposed to catalyze the first step in the conjugation of C24 bile acids (choloneates) to glycine and taurine before excretion into bile canaliculi by activating them to their CoA thioesters. Seems to activate secondary bile acids entering the liver from the enterohepatic circulation. In vitro, also activates 3-alpha,7-alpha,12-alpha-trihydroxy-5-beta-cholestanate (THCA), the C27 precursor of cholic acid deriving from the de novo synthesis from cholesterol.
- Gene Name:
- SLC27A5
- Uniprot ID:
- Q9Y2P5
- Molecular weight:
- 75384.375
- General function:
- Involved in binding
- Specific function:
- Ileal protein which stimulates gastric acid and pepsinogen secretion. Seems to be able to bind to bile salts and bilirubins. Isoform 2 is essential for the survival of colon cancer cells to bile acid-induced apoptosis
- Gene Name:
- FABP6
- Uniprot ID:
- P51161
- Molecular weight:
- 14371.2
References
- Kurz M, Brachvogel V, Matter H, Stengelin S, Thuring H, Kramer W: Insights into the bile acid transportation system: the human ileal lipid-binding protein-cholyltaurine complex and its comparison with homologous structures. Proteins. 2003 Feb 1;50(2):312-28. [PubMed:12486725 ]
Transporters
- General function:
- Involved in transporter activity
- Specific function:
- Mediates the Na(+)-independent transport of organic anions such as 17-beta-glucuronosyl estradiol, taurocholate, triiodothyronine (T3), leukotriene C4, dehydroepiandrosterone sulfate (DHEAS), methotrexate and sulfobromophthalein (BSP)
- Gene Name:
- SLCO1B3
- Uniprot ID:
- Q9NPD5
- Molecular weight:
- 77402.2
- General function:
- Involved in transporter activity
- Specific function:
- Mediates the Na(+)-independent transport of organic anions such as pravastatin, taurocholate, methotrexate, dehydroepiandrosterone sulfate, 17-beta-glucuronosyl estradiol, estrone sulfate, prostaglandin E2, thromboxane B2, leukotriene C3, leukotriene E4, thyroxine and triiodothyronine. May play an important role in the clearance of bile acids and organic anions from the liver
- Gene Name:
- SLCO1B1
- Uniprot ID:
- Q9Y6L6
- Molecular weight:
- 76448.0
References
- Michalski C, Cui Y, Nies AT, Nuessler AK, Neuhaus P, Zanger UM, Klein K, Eichelbaum M, Keppler D, Konig J: A naturally occurring mutation in the SLC21A6 gene causing impaired membrane localization of the hepatocyte uptake transporter. J Biol Chem. 2002 Nov 8;277(45):43058-63. Epub 2002 Aug 23. [PubMed:12196548 ]
- General function:
- Involved in ATP binding
- Specific function:
- May act as an inducible transporter in the biliary and intestinal excretion of organic anions. Acts as an alternative route for the export of bile acids and glucuronides from cholestatic hepatocytes
- Gene Name:
- ABCC3
- Uniprot ID:
- O15438
- Molecular weight:
- 169341.1
- General function:
- Involved in ATP binding
- Specific function:
- Involved in the ATP-dependent secretion of bile salts into the canaliculus of hepatocytes
- Gene Name:
- ABCB11
- Uniprot ID:
- O95342
- Molecular weight:
- 146405.8
- General function:
- Involved in bile acid:sodium symporter activity
- Specific function:
- Plays a critical role in the sodium-dependent reabsorption of bile acids from the lumen of the small intestine. Plays a key role in cholesterol metabolism
- Gene Name:
- SLC10A2
- Uniprot ID:
- Q12908
- Molecular weight:
- 37697.4
References
- Kramer W, Girbig F, Glombik H, Corsiero D, Stengelin S, Weyland C: Identification of a ligand-binding site in the Na+/bile acid cotransporting protein from rabbit ileum. J Biol Chem. 2001 Sep 21;276(38):36020-7. Epub 2001 Jul 10. [PubMed:11447228 ]
- General function:
- Involved in bile acid:sodium symporter activity
- Specific function:
- The hepatic sodium/bile acid uptake system exhibits broad substrate specificity and transports various non-bile acid organic compounds as well. It is strictly dependent on the extracellular presence of sodium.
- Gene Name:
- SLC10A1
- Uniprot ID:
- Q14973
- Molecular weight:
- 38118.64
- General function:
- Involved in transporter activity
- Specific function:
- Mediates the Na(+)-independent transport of organic anions such as sulfobromophthalein (BSP) and conjugated (taurocholate) and unconjugated (cholate) bile acids
- Gene Name:
- SLCO1A2
- Uniprot ID:
- P46721
- Molecular weight:
- 74144.1
- General function:
- Involved in transporter activity
- Specific function:
- Mediates the Na(+)-independent transport of organic anions such as the thyroid hormones T3 (triiodo-L-thyronine), T4 (thyroxine) and rT3, and of estrone-3-sulfate and taurocholate
- Gene Name:
- SLCO4A1
- Uniprot ID:
- Q96BD0
- Molecular weight:
- 77192.5