Record Information
Version1.0
StatusDetected and Quantified
Creation Date2021-11-19 15:43:26 UTC
Update Date2024-04-30 20:30:33 UTC
Metabolite IDMMDBc0047803
Metabolite Identification
Common NameCE(18:0)
DescriptionCE(18:0) is a cholesterol fatty acid ester or simply a cholesterol ester (CE). Cholesterol esters are cholesterol molecules with long-chain fatty acids linked to the hydroxyl group. They are much less polar than free cholesterol and appear to be the preferred form for transport in plasma and for storage. Cholesterol esters do not contribute to membranes but are packed into intracellular lipid particles or lipoprotein particles. Because of the mechanism of synthesis, plasma cholesterol esters tend to contain relatively high proportions of C18 fatty acids. Cholesterol esters are major constituents of the adrenal glands and they also accumulate in the fatty lesions of atherosclerotic plaques. Cholesterol esters are also major constituents of the lipoprotein particles carried in blood (HDL, LDL, VLDL). The cholesterol esters in high-density lipoproteins (HDL) are synthesized largely by transfer of fatty acids to cholesterol from position sn-2 (or C-2) of phosphatidylcholine catalyzed by the enzyme lecithin cholesterol acyl transferase (LCAT). The enzyme also promotes the transfer of cholesterol from cells to HDL. As cholesterol esters accumulate in the lipoprotein core, cholesterol is removed from its surface thus promoting the flow of cholesterol from cell membranes into HDL. This in turn leads to morphological changes in HDL, which grow and become spherical. Subsequently, cholesterol esters are transferred to the other lipoprotein fractions LDL and VLDL, a reaction catalyzed by cholesteryl ester transfer protein. Another enzyme, acyl-CoA:cholesterol acyltransferase (ACAT) synthesizes cholesterol esters from CoA esters of fatty acids and cholesterol. Cholesterol ester hydrolases liberate cholesterol and free fatty acids when required for membrane and lipoprotein formation, and they also provide cholesterol for hormone synthesis in adrenal cells.
Structure
Synonyms
ValueSource
1-Stearoyl-cholesterolHMDB
18:0 Cholesterol esterHMDB
CE(18:0/0:0)HMDB
Cholesterol 1-octadecanoateHMDB
Cholesterol 1-octadecanoic acidHMDB
Cholesterol 1-stearoateHMDB
Cholesterol 1-stearoic acidHMDB
Cholesterol ester(18:0)HMDB
Cholesterol ester(18:0/0:0)HMDB
Cholesteryl 1-octadecanoateHMDB
Cholesteryl 1-octadecanoic acidHMDB
Cholesteryl 1-stearoateHMDB
Cholesteryl 1-stearoic acidHMDB
1-Octadecanoyl-cholesterolHMDB
CE(18:0)Lipid Annotator
Molecular FormulaC45H80O2
Average Mass653.1155
Monoisotopic Mass652.615831804
IUPAC Name(2R,5S,15R)-2,15-dimethyl-14-[(2R)-6-methylheptan-2-yl]tetracyclo[8.7.0.0²,⁷.0¹¹,¹⁵]heptadec-7-en-5-yl octadecanoate
Traditional Name(2R,5S,15R)-2,15-dimethyl-14-[(2R)-6-methylheptan-2-yl]tetracyclo[8.7.0.0²,⁷.0¹¹,¹⁵]heptadec-7-en-5-yl octadecanoate
CAS Registry NumberNot Available
SMILES
CCCCCCCCCCCCCCCCCC(=O)O[C@H]1CC[C@]2(C)C3CC[C@]4(C)C(CCC4C3CC=C2C1)[C@H](C)CCCC(C)C
InChI Identifier
InChI=1S/C45H80O2/c1-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21-25-43(46)47-38-30-32-44(5)37(34-38)26-27-39-41-29-28-40(36(4)24-22-23-35(2)3)45(41,6)33-31-42(39)44/h26,35-36,38-42H,7-25,27-34H2,1-6H3/t36-,38+,39?,40?,41?,42?,44+,45-/m1/s1
InChI KeyXHRPOTDGOASDJS-GHOVPUJYSA-N