Page last updated: 2024-10-24

cholesterol transfer activity

Definition

Target type: molecularfunction

Removes cholesterol from a membrane or a monolayer lipid particle, transports it through the aqueous phase while protected in a hydrophobic pocket, and brings it to an acceptor membrane or lipid particle. [GOC:krc, PMID:20823909, PMID:24220498, PMID:25797198]

Cholesterol transfer activity is a molecular function that describes the ability of proteins to move cholesterol molecules between different cellular compartments or between different cells. Cholesterol is a vital lipid molecule that plays critical roles in cell membrane structure, signaling pathways, and steroid hormone synthesis. The transfer of cholesterol is essential for maintaining the appropriate levels of cholesterol in different cellular locations, ensuring proper membrane fluidity and function.

Cholesterol transfer proteins can be categorized into several families, including:

* **Steroidogenic Acute Regulatory Protein (StAR):** StAR facilitates the movement of cholesterol from the outer mitochondrial membrane to the inner mitochondrial membrane, where it is used for steroid hormone synthesis.
* **ATP-binding cassette (ABC) Transporters:** Some ABC transporters, such as ABCA1 and ABCG1, are involved in the export of cholesterol from cells.
* **Scavenger Receptor Class B, Type I (SR-BI):** SR-BI mediates selective uptake of cholesterol from high-density lipoprotein (HDL) particles.
* **Niemann-Pick C1 (NPC1) and NPC2 Proteins:** These proteins are involved in intracellular cholesterol trafficking and delivery to lysosomes for degradation.

These cholesterol transfer proteins utilize diverse mechanisms to facilitate cholesterol movement. Some proteins bind cholesterol directly, while others act as chaperones, assisting in the transport of cholesterol by other proteins. The specific mechanism of cholesterol transfer often involves interactions with specific lipid binding sites on the protein and may be influenced by factors such as the concentration of cholesterol, the presence of other lipids, and the cellular environment.

Dysregulation of cholesterol transfer activity can have significant implications for health. Mutations in genes encoding cholesterol transfer proteins can lead to various diseases, including Niemann-Pick disease, Tangier disease, and familial hypercholesterolemia. Additionally, alterations in cholesterol transfer pathways can contribute to the development of cardiovascular disease, neurodegenerative disorders, and cancer.

In summary, cholesterol transfer activity is a critical molecular function that ensures the proper distribution and utilization of cholesterol within cells. Understanding the mechanisms and regulation of cholesterol transfer is crucial for developing therapeutic strategies to treat diseases associated with cholesterol dysregulation.'
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Proteins (5)

ProteinDefinitionTaxonomy
Translocator protein[no definition available]Homo sapiens (human)
Niemann-Pick C1-like 1 protein[no definition available]Canis lupus familiaris (dog)
Microsomal triglyceride transfer protein large subunitA microsomal triglyceride transfer protein large subunit that is encoded in the genome of human. [PRO:HJD, UniProtKB:P55157]Homo sapiens (human)
Translocator protein[no definition available]Homo sapiens (human)
Cholesteryl ester transfer proteinA cholesteryl ester transfer protein that is encoded in the genome of human. [PRO:DNx, UniProtKB:P11597]Homo sapiens (human)

Compounds (58)

CompoundDefinitionClassesRoles
niacinNiacin: A water-soluble vitamin of the B complex occurring in various animal and plant tissues. It is required by the body for the formation of coenzymes NAD and NADP. It has PELLAGRA-curative, vasodilating, and antilipemic properties.

nicotinic acid : A pyridinemonocarboxylic acid that is pyridine in which the hydrogen at position 3 is replaced by a carboxy group.

vitamin B3 : Any member of a group of vitamers that belong to the chemical structural class called pyridines that exhibit biological activity against vitamin B3 deficiency. Vitamin B3 deficiency causes a condition known as pellagra whose symptoms include depression, dermatitis and diarrhea. The vitamers include nicotinic acid and nicotinamide (and their ionized and salt forms).
pyridine alkaloid;
pyridinemonocarboxylic acid;
vitamin B3
antidote;
antilipemic drug;
EC 3.5.1.19 (nicotinamidase) inhibitor;
Escherichia coli metabolite;
human urinary metabolite;
metabolite;
mouse metabolite;
plant metabolite;
vasodilator agent
pk 11195PK-11195 : A monocarboxylic acid amide obtained by formal condensation of the carboxy group of 1-(2-chlorophenyl)isoquinoline-3-carboxylic acid with the amino group of sec-butylmethylaminearomatic amide;
isoquinolines;
monocarboxylic acid amide;
monochlorobenzenes
antineoplastic agent
ro 5-48644'-chlorodiazepam: selectively binds peripheral benzodiazepine receptor
clonazepamclonazepam : 1,3-Dihydro-2H-1,4-benzodiazepin-2-one in which the hydrogens at positions 5 and 7 are substituted by 2-chlorophenyl and nitro groups, respectively. It is used in the treatment of all types of epilepsy and seizures, as well as myoclonus and associated abnormal movements, and panic disorders. However, its use can be limited by the development of tolerance and by sedation.

Clonazepam: An anticonvulsant used for several types of seizures, including myotonic or atonic seizures, photosensitive epilepsy, and absence seizures, although tolerance may develop. It is seldom effective in generalized tonic-clonic or partial seizures. The mechanism of action appears to involve the enhancement of GAMMA-AMINOBUTYRIC ACID receptor responses.
1,4-benzodiazepinone;
monochlorobenzenes
anticonvulsant;
anxiolytic drug;
GABA modulator
nordazepamnordazepam : A 1,4-benzodiazepinone having phenyl and chloro substituents at positions 5 and 7 respectively; it has anticonvulsant, anxiolytic, muscle relaxant and sedative properties but is used primarily in the treatment of anxiety.

Nordazepam: An intermediate in the metabolism of DIAZEPAM to OXAZEPAM. It may have actions similar to those of diazepam.
1,4-benzodiazepinone;
organochlorine compound
anticonvulsant;
anxiolytic drug;
GABA modulator;
human metabolite;
sedative
diazepamdiazepam : A 1,4-benzodiazepinone that is 1,3-dihydro-2H-1,4-benzodiazepin-2-one substituted by a chloro group at position 7, a methyl group at position 1 and a phenyl group at position 5.

Diazepam: A benzodiazepine with anticonvulsant, anxiolytic, sedative, muscle relaxant, and amnesic properties and a long duration of action. Its actions are mediated by enhancement of GAMMA-AMINOBUTYRIC ACID activity.
1,4-benzodiazepinone;
organochlorine compound
anticonvulsant;
anxiolytic drug;
environmental contaminant;
sedative;
xenobiotic
flunitrazepamflunitrazepam : A 1,4-benzodiazepinone that is nitrazepam substituted by a methyl group at position 1 and by a fluoro group at position 2'. It is a potent hypnotic, sedative, and amnestic drug used to treat chronic insomnia.

Flunitrazepam: A benzodiazepine with pharmacologic actions similar to those of DIAZEPAM that can cause ANTEROGRADE AMNESIA. Some reports indicate that it is used as a date rape drug and suggest that it may precipitate violent behavior. The United States Government has banned the importation of this drug.
1,4-benzodiazepinone;
C-nitro compound;
monofluorobenzenes
anxiolytic drug;
GABAA receptor agonist;
sedative
lorazepamLorazepam: A benzodiazepine used as an anti-anxiety agent with few side effects. It also has hypnotic, anticonvulsant, and considerable sedative properties and has been proposed as a preanesthetic agent.benzodiazepine
nevirapinenevirapine : A dipyridodiazepine that is 5,11-dihydro-6H-dipyrido[3,2-b:2',3'-e][1,4]diazepine which is substituted by methyl, oxo, and cyclopropyl groups at positions 4, 6, and 11, respectively. A non-nucleoside reverse transcriptase inhibitor with activity against HIV-1, it is used in combination with other antiretrovirals for the treatment of HIV infection.

Nevirapine: A potent, non-nucleoside reverse transcriptase inhibitor used in combination with nucleoside analogues for treatment of HIV INFECTIONS and AIDS.
cyclopropanes;
dipyridodiazepine
antiviral drug;
HIV-1 reverse transcriptase inhibitor
nitrazepamnitrazepam : A 1,4-benzodiazepinone that is 1,3-dihydro-2H-1,4-benzodiazepin-2-one which is substituted at positions 5 and 7 by phenyl and nitro groups, respectively. It is used as a hypnotic for the short-term management of insomnia and for the treatment of epileptic spasms in infants (West's syndrome).

Nitrazepam: A benzodiazepine derivative used as an anticonvulsant and hypnotic.
1,4-benzodiazepinone;
C-nitro compound
anticonvulsant;
antispasmodic drug;
drug metabolite;
GABA modulator;
sedative
cm 7116norflutoprazepam: structurebenzodiazepine
oxazepamoxazepam : A 1,4-benzodiazepinone that is 1,3-dihydro-2H-1,4-benzodiazepin-2-one substituted by a chloro group at position 7, a hydroxy group at position 3 and phenyl group at position 5.

Oxazepam: A benzodiazepine used in the treatment of anxiety, alcohol withdrawal, and insomnia.
1,4-benzodiazepinone;
organochlorine compound
anxiolytic drug;
environmental contaminant;
xenobiotic
temazepamTemazepam: A benzodiazepine that acts as a GAMMA-AMINOBUTYRIC ACID modulator and anti-anxiety agent.benzodiazepine
chlordesmethyldiazepambenzodiazepine
halazepamhalazepam: structureorganic molecular entity
alpidemimidazoles
efavirenzefavirenz : 1,4-Dihydro-2H-3,1-benzoxazin-2-one substituted at the 4 position by cyclopropylethynyl and trifluoromethyl groups (S configuration) and at the 6 position by chlorine. A non-nucleoside reverse transcriptase inhibitor with activity against HIV, it is used with other antiretrovirals for combination therapy of HIV infection.

efavirenz: HIV-1 reverse transcriptase inhibitor
acetylenic compound;
benzoxazine;
cyclopropanes;
organochlorine compound;
organofluorine compound
antiviral drug;
HIV-1 reverse transcriptase inhibitor
ursolic acidhydroxy monocarboxylic acid;
pentacyclic triterpenoid
geroprotector;
plant metabolite
n-desmethylflunitrazepam
7-aminonitrazepam7-aminonitrazepam: urinary metabolite of nitrazepambenzodiazepine
ro 20-18157-aminoflunitrazepam: flunitrazepam metabolite; structure given in first sourcebenzodiazepine
dx 9065
ro 11-6893Ro 11-6893: RN given refers to (R)-isomer
n,n-di-n-hexyl-2-(4-fluorophenyl)indole-3-acetamideN,N-di-n-hexyl-2-(4-fluorophenyl)indole-3-acetamide: binds with high affinity to glial mitochondrial diazepam binding inhibitor receptors & increases mitochondrial steroidogenesisphenylindole
torcetrapib(trifluoromethyl)benzenes;
carbamate ester;
quinolines
anticholesteremic drug;
CETP inhibitor
sb 203580imidazoles;
monofluorobenzenes;
pyridines;
sulfoxide
EC 2.7.11.1 (non-specific serine/threonine protein kinase) inhibitor;
EC 2.7.11.24 (mitogen-activated protein kinase) inhibitor;
geroprotector;
Hsp90 inhibitor;
neuroprotective agent
7-aminoclonazepambenzodiazepine
ro 5-3438Ro 5-3438: structure
n-desmethylflunitrazepamN-desmethylflunitrazepam: metabolite of flunitrazepam
ro 05-4082ID 690: methyl deriv of clonazepam; structure
delta-8-tetrahydrocannabinol1-benzopyran
17-(dimethylaminoethylamino)-17-demethoxygeldanamycin17-(dimethylaminoethylamino)-17-demethoxygeldanamycin: structure in first source

alvespimycin : A 19-membered macrocyle that is geldanamycin in which the methoxy group attached to the benzoquinone moiety has been replaced by a 2-(N,N-dimethylamino)ethylamino group.
1,4-benzoquinones;
ansamycin;
carbamate ester;
secondary amino compound;
tertiary amino compound
Hsp90 inhibitor
ac-5216
tanespimycinCP 127374: analog of herbimycin A1,4-benzoquinones;
ansamycin;
carbamate ester;
organic heterobicyclic compound;
secondary amino compound
antineoplastic agent;
apoptosis inducer;
Hsp90 inhibitor
cb 34CB 34: ligand for peripheral benzodiazepine receptors; structure in first source
dalcetrapibdalcetrapib: inhibits cholesteryl ester transfer protein (CETP)anilide
am-411
sc 795
3-((3-(4-chloro-3-ethylphenoxy)phenyl)(3-(1,1,2,2-tetrafluoroethoxy)benzyl)amino)-1,1,1-trifluoropropan-2-ol3-((3-(4-chloro-3-ethylphenoxy)phenyl)(3-(1,1,2,2-tetrafluoroethoxy)benzyl)amino)-1,1,1-trifluoropropan-2-ol: inhibits cholesteryl ester transfer protein; structure in first source
n-(2-methoxybenzyl)-n-(4-phenoxypyridin-3-yl)acetamideN-(2-methoxybenzyl)-N-(4-phenoxypyridin-3-yl)acetamide: for imaging brain peripheral benzodiazepine receptors; structure in first source
bms201038BMS201038: an anticholesteremic agent and microsomal triglycide transfer protein inhibitor

lomitapide : A member of the class of benzamides obtained by formal condensation of the carboxy group of 4'-(trifluoromethyl)biphenyl-2-carboxylic acid with the primary amino group of 9-[4-(4-aminopiperidin-1-yl)butyl]-N-(2,2,2-trifluoroethyl)-9H-fluorene-9-carboxamide. Used (as its mesylate salt) as a complement to a low-fat diet and other lipid-lowering treatments in patients with homozygous familial hypercholesterolemia.
(trifluoromethyl)benzenes;
benzamides;
fluorenes;
piperidines
anticholesteremic drug;
MTP inhibitor
sch 60663SCH 60663: structure in first source
dirlotapidedirlotapide: structure in first source
ssr180575SSR180575: structure in first source
amg 3AMG 3: structure in first source
km-233KM-233: used for the treatment of high-grade glioma; structure in first source
daa 1106
mk 0354
naluzotannaluzotan: an antidepressant and anti-anxiety agent; structure in first source
anacetrapib
dpa-713
a 803467A 803467: an Nav1.8 sodium channel blocker; structure in first source
gdc 0941pictrelisib : A sulfonamide composed of indazole, morpholine, and methylsulfonyl-substituted piperazine rings bound to a thienopyrimidine ring.indazoles;
morpholines;
piperazines;
sulfonamide;
thienopyrimidine
EC 2.7.1.137 (phosphatidylinositol 3-kinase) inhibitor
jnj-31020028
n-fluoroacetyl-n-(2,5-dimethoxybenzyl)-2-phenoxyanilineN-fluoroacetyl-N-(2,5-dimethoxybenzyl)-2-phenoxyaniline: a peripheral benzodiazepine receptor PET ligand; structure in first source
skepinone-lskepinone-L: a dibenzosuberone-type p38 MAPK inhibitor; structure in first source
evacetrapibbenzazepine
MS-417MS-417 : A member of the class of thienotriazolodiazepines that is the methyl ester of [(6S)-4-(4-chlorophenyl)-2,3,9-trimethyl-6H-thieno[3,2-f][1,2,4]triazolo[4,3-a][1,4]diazepin-6-yl]acetic acid. A bromodomain and extra-terminal domain (BET)-specific inhibitor that belongs to a group of thienodiazepine-based compoundsmethyl ester;
monochlorobenzenes;
thienotriazolodiazepine