Page last updated: 2024-10-24

low-density lipoprotein particle

Definition

Target type: cellularcomponent

A lipoprotein particle, rich in cholesterol esters and low in triglycerides that is typically composed of APOB100 and APOE and has a density of 1.02-1.06 g/ml and a diameter of between 20-25 nm. LDL particles are formed from VLDL particles (via IDL) by the loss of triglyceride and gain of cholesterol ester. They transport endogenous cholesterol (and to some extent triglycerides) from peripheral tissues back to the liver. [GOC:BHF, GOC:expert_pt, GOC:mah, GOC:rl]

Low-density lipoprotein (LDL) particles are complex structures composed of a core of cholesterol esters and triglycerides surrounded by a phospholipid monolayer. The monolayer contains various proteins, including apolipoprotein B-100 (apoB-100), which anchors the particle and acts as a ligand for LDL receptor binding. The phospholipid monolayer serves as a barrier between the hydrophobic core and the aqueous environment.

Embedded within the monolayer are free cholesterol molecules and phospholipids, contributing to the particle's overall structure and stability. Cholesterol esters, primarily cholesteryl oleate and cholesteryl linoleate, are the main component of the core. These esters are formed by the esterification of cholesterol with fatty acids, primarily oleic acid and linoleic acid. Triglycerides are also found in the core, contributing to the particle's energy content.

The composition of the LDL particle varies depending on its density and origin. However, the core typically comprises about 50-60% cholesterol esters and 30-40% triglycerides, while the monolayer contains approximately 20% protein, 20% phospholipids, and 10% free cholesterol.

The cellular component of LDL particles is primarily the phospholipid monolayer and the embedded proteins, which interact with cellular receptors and enzymes to mediate LDL uptake and metabolism.'
"

Proteins (2)

ProteinDefinitionTaxonomy
Platelet-activating factor acetylhydrolaseA platelet-activating factor acetylhydrolase that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q13093]Homo sapiens (human)
Low-density lipoprotein receptorA low-density lipoprotein receptor that is encoded in the genome of human. [PRO:DNx, UniProtKB:P01130]Homo sapiens (human)

Compounds (19)

CompoundDefinitionClassesRoles
ly 171883LY 171883: structure in first source; leukotriene receptor antagonist

tomelukast : A member of the class of acetophenones that is 1-phenylethanone substituted at position 2 by a hydroxy group, a propyl group at position 3 and a 4-(1H-tetrazol-5-yl)butoxy group at position 4. A leukotriene antagonist, it exhibits anti-asthmatic activity.
acetophenones;
aromatic ether;
phenols;
tetrazoles
anti-asthmatic drug;
leukotriene antagonist
vitamin k 3Vitamin K 3: A synthetic naphthoquinone without the isoprenoid side chain and biological activity, but can be converted to active vitamin K2, menaquinone, after alkylation in vivo.1,4-naphthoquinones;
vitamin K
angiogenesis inhibitor;
antineoplastic agent;
EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor;
human urinary metabolite;
nutraceutical
raloxifeneraloxifene : A member of the class of 1-benzothiophenes that is 1-benzothiophene in which the hydrogens at positions 2, 3, and 6 have been replaced by p-hydroxyphenyl, p-[2-(piperidin-1-yl)ethoxy]benzoyl, and hydroxy groups, respectively.1-benzothiophenes;
aromatic ketone;
N-oxyethylpiperidine;
phenols
bone density conservation agent;
estrogen antagonist;
estrogen receptor modulator
1,6-bis(cyclohexyloximinocarbonyl)hexane1,6-bis(cyclohexyloximinocarbonyl)hexane: selective inhibitor of canine platelet diglyceride lipasecarbamate ester;
organonitrogen compound
vorinostatvorinostat : A dicarboxylic acid diamide comprising suberic (octanedioic) acid coupled to aniline and hydroxylamine. A histone deacetylase inhibitor, it is marketed under the name Zolinza for the treatment of cutaneous T cell lymphoma (CTCL).

Vorinostat: A hydroxamic acid and anilide derivative that acts as a HISTONE DEACETYLASE inhibitor. It is used in the treatment of CUTANEOUS T-CELL LYMPHOMA and SEZARY SYNDROME.
dicarboxylic acid diamide;
hydroxamic acid
antineoplastic agent;
apoptosis inducer;
EC 3.5.1.98 (histone deacetylase) inhibitor
5,5-dimethylhydantoin5,5-dimethylhydantoin: RN given refers to parent cpdimidazolidine-2,4-dione
benzenesulfonamidesulfonamide
plumbaginplumbagin : A hydroxy-1,4-naphthoquinone that is 1,4-naphthoquinone in which the hydrogens at positions 2 and 5 are substituted by methyl and hydroxy groups, respectively.

plumbagin: a superoxide anion generator
hydroxy-1,4-naphthoquinone;
phenols
anticoagulant;
antineoplastic agent;
immunological adjuvant;
metabolite
wy 48252Wy 48252: leukotriene D4 antagonist
4-[1-[4-[2-(dimethylamino)ethoxy]phenyl]-2-phenylbut-1-enyl]phenolstilbenoid
spiroglumidespiroglumide: a CCK receptor antagonist; antigastrin; structure given in first source
s 1033(trifluoromethyl)benzenes;
imidazoles;
pyridines;
pyrimidines;
secondary amino compound;
secondary carboxamide
anticoronaviral agent;
antineoplastic agent;
tyrosine kinase inhibitor
tamoxifenstilbenoid;
tertiary amino compound
angiogenesis inhibitor;
antineoplastic agent;
bone density conservation agent;
EC 1.2.3.1 (aldehyde oxidase) inhibitor;
EC 2.7.11.13 (protein kinase C) inhibitor;
estrogen antagonist;
estrogen receptor antagonist;
estrogen receptor modulator
orlistatorlistat : A carboxylic ester resulting from the formal condensation of the carboxy group of N-formyl-L-leucine with the hydroxy group of (3S,4S)-3-hexyl-4-[(2S)-2-hydroxytridecyl]oxetan-2-one. A pancreatic lipase inhibitor, it is used as an anti-obesity drug.

Orlistat: A lactone derivative of LEUCINE that acts as a pancreatic lipase inhibitor to limit the absorption of dietary fat; it is used in the management of obesity.
beta-lactone;
carboxylic ester;
formamides;
L-leucine derivative
anti-obesity agent;
bacterial metabolite;
EC 2.3.1.85 (fatty acid synthase) inhibitor;
EC 3.1.1.3 (triacylglycerol lipase) inhibitor
arachidonyltrifluoromethaneAACOCF3 : A fatty acid derivative that is arachidonic acid in which the OH part of the carboxy group has been replaced by a trifluoromethyl group

arachidonyltrifluoromethane: structure given in first source; inhibits 85-kDa phospholipase A2
fatty acid derivative;
ketone;
olefinic compound;
organofluorine compound
EC 3.1.1.4 (phospholipase A2) inhibitor
manoalidemanoalide : A sesterterpenoid isolated from the marine sponge Luffariella variabilis and which has been shown to exhibit inhibitory activity towards phospholipase A2.

manoalide: phospholipase A2 inhibitor; sesterterpene from marine sponge L. variabilis; structure given in first source
butenolide;
lactol;
sesterterpenoid
EC 3.1.1.4 (phospholipase A2) inhibitor;
EC 5.99.1.2 (DNA topoisomerase) inhibitor;
EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor;
metabolite
darapladibdarapladib: a selective lipoprotein-associated phospholipase A(2) (Lp-PLA(2)) inhibitor, on biomarkers of cardiovascular (CV) risk
sb-435495SB-435495: structure in first source
14-methyl-20-oxa-5,7,14,26-tetraazatetracyclo(19.3.1.1(2,6).1(8,12))heptacosa-1(25),2(26),3,5,8(27),9,11,16,21,23-decaene14-methyl-20-oxa-5,7,14,26-tetraazatetracyclo(19.3.1.1(2,6).1(8,12))heptacosa-1(25),2(26),3,5,8(27),9,11,16,21,23-decaene: has antineoplastic activity; also inhibits Fms-like tyrosine kinase-3; structure in first source