Target type: biologicalprocess
The directed movement of a long-chain fatty acid from outside of a cell, across the plasma membrane and into the cytosol. A long-chain fatty acid has an aliphatic tail containing 13 to 22 carbons. [GOC:ai]
Long-chain fatty acid (LCFA) import across the plasma membrane is a complex process essential for cellular energy production, membrane biosynthesis, and signaling. The process involves the concerted action of several proteins and is tightly regulated to ensure efficient uptake while preventing excessive accumulation of fatty acids.
Here's a detailed description of the process:
1. **Binding to Plasma Membrane:** LCFAs are hydrophobic molecules and require assistance to cross the hydrophilic plasma membrane. They first bind to plasma membrane-associated proteins, such as **fatty acid translocase (FAT/CD36)**. FAT/CD36 serves as a receptor for LCFAs, facilitating their initial interaction with the membrane.
2. **Facilitated Diffusion:** The binding of LCFAs to FAT/CD36 initiates a cascade of events leading to their facilitated diffusion across the membrane. This process involves the participation of other membrane proteins, notably **plasma membrane fatty acid-binding protein (FABPpm)**. FABPpm, located within the plasma membrane, binds to LCFAs and may help shuttle them across the membrane.
3. **Intracellular Transport:** Once inside the cell, LCFAs are bound by **cytosolic fatty acid-binding proteins (FABPcs)**. These proteins function as intracellular chaperones, transporting LCFAs to various cellular compartments, including the mitochondria for energy production or the endoplasmic reticulum for biosynthesis.
4. **Regulation:** The import of LCFAs is tightly regulated to ensure appropriate levels within the cell. Several factors influence this regulation, including:
- **Hormonal signals:** Hormones like insulin and leptin can modulate LCFA uptake.
- **Cellular energy status:** High ATP levels tend to inhibit LCFA uptake, while low ATP levels stimulate it.
- **Availability of other energy sources:** Glucose availability can suppress LCFA uptake.
5. **Alternative Pathways:** While the FAT/CD36 pathway is the primary route for LCFA import, other mechanisms exist. In some tissues, LCFAs can also be taken up through **passive diffusion** or via **protein-mediated transport** involving **membrane transport proteins**.
Overall, the import of LCFAs across the plasma membrane is a carefully orchestrated process involving multiple proteins, regulatory mechanisms, and alternative pathways. This ensures that cells can efficiently utilize LCFAs for essential metabolic functions while maintaining homeostasis.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Solute carrier family 2, facilitated glucose transporter member 1 | A solute carrier family 2, facilitated glucose transporter member 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P11166] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| gossypol | Gossypol: A dimeric sesquiterpene found in cottonseed (GOSSYPIUM). The (-) isomer is active as a male contraceptive (CONTRACEPTIVE AGENTS, MALE) whereas toxic symptoms are associated with the (+) isomer. | ||
| phloretin | dihydrochalcones | antineoplastic agent; plant metabolite | |
| cytidine | cytidines | Escherichia coli metabolite; human metabolite; mouse metabolite; Saccharomyces cerevisiae metabolite | |
| cycloheximide | cycloheximide : A dicarboximide that is 4-(2-hydroxyethyl)piperidine-2,6-dione in which one of the hydrogens attached to the carbon bearing the hydroxy group is replaced by a 3,5-dimethyl-2-oxocyclohexyl group. It is an antibiotic produced by the bacterium Streptomyces griseus. Cycloheximide: Antibiotic substance isolated from streptomycin-producing strains of Streptomyces griseus. It acts by inhibiting elongation during protein synthesis. | antibiotic fungicide; cyclic ketone; dicarboximide; piperidine antibiotic; piperidones; secondary alcohol | anticoronaviral agent; bacterial metabolite; ferroptosis inhibitor; neuroprotective agent; protein synthesis inhibitor |
| emetine | emetine : A pyridoisoquinoline comprising emetam having methoxy substituents at the 6'-, 7'-, 10- and 11-positions. It is an antiprotozoal agent and emetic. It inhibits SARS-CoV2, Zika and Ebola virus replication and displays antimalarial, antineoplastic and antiamoebic properties. Emetine: The principal alkaloid of ipecac, from the ground roots of Uragoga (or Cephaelis) ipecacuanha or U. acuminata, of the Rubiaceae. It is used as an amebicide in many different preparations and may cause serious cardiac, hepatic, or renal damage and violent diarrhea and vomiting. Emetine inhibits protein synthesis in EUKARYOTIC CELLS but not PROKARYOTIC CELLS. | isoquinoline alkaloid; pyridoisoquinoline | antiamoebic agent; anticoronaviral agent; antiinfective agent; antimalarial; antineoplastic agent; antiprotozoal drug; antiviral agent; autophagy inhibitor; emetic; expectorant; plant metabolite; protein synthesis inhibitor |
| c 137 | C 137: RN given refers to parent cpd | ||
| imidocarb | Imidocarb: One of ANTIPROTOZOAL AGENTS used especially against BABESIA in livestock. Toxicity has been reported. | ureas | antiprotozoal drug |
| colforsin | Colforsin: Potent activator of the adenylate cyclase system and the biosynthesis of cyclic AMP. From the plant COLEUS FORSKOHLII. Has antihypertensive, positive inotropic, platelet aggregation inhibitory, and smooth muscle relaxant activities; also lowers intraocular pressure and promotes release of hormones from the pituitary gland. | acetate ester; cyclic ketone; labdane diterpenoid; organic heterotricyclic compound; tertiary alpha-hydroxy ketone; triol | adenylate cyclase agonist; anti-HIV agent; antihypertensive agent; plant metabolite; platelet aggregation inhibitor; protein kinase A agonist |
| 1,1-Dichloro-2,2-bis(4-hydroxyphenyl)ethylene | diarylmethane | ||
| mmv665852 | MMV665852: an antischistosomal agent | ||
| 1,3,4,10-Tetrahydro-9(2H)-acridinone | acridines | ||
| anisomycin | (-)-anisomycin : An antibiotic isolated from various Streptomyces species. It interferes with protein and DNA synthesis by inhibiting peptidyl transferase or the 80S ribosome system. Anisomycin: An antibiotic isolated from various Streptomyces species. It interferes with protein and DNA synthesis by inhibiting peptidyl transferase or the 80S ribosome system. | monohydroxypyrrolidine; organonitrogen heterocyclic antibiotic | anticoronaviral agent; antimicrobial agent; antineoplastic agent; antiparasitic agent; bacterial metabolite; DNA synthesis inhibitor; protein synthesis inhibitor |
| jp-1302 | |||
| 1,4,8-trimethyl-12-quinolino[2,3-b]quinolinamine | aminoquinoline | ||
| polysulfide rubber | |||
| 2-[2-methoxyethyl-(1-oxo-2-thiophen-2-ylethyl)amino]-N-[(4-methoxyphenyl)methyl]-2-(4-propan-2-ylphenyl)acetamide | monoterpenoid | ||
| kaempferol | 7-hydroxyflavonol; flavonols; tetrahydroxyflavone | antibacterial agent; geroprotector; human blood serum metabolite; human urinary metabolite; human xenobiotic metabolite; plant metabolite | |
| genistein | 7-hydroxyisoflavones | antineoplastic agent; EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor; geroprotector; human urinary metabolite; phytoestrogen; plant metabolite; tyrosine kinase inhibitor | |
| cytochalasin b | cytochalasin B : An organic heterotricyclic compound, that is a mycotoxin which is cell permeable an an inhibitor of cytoplasmic division by blocking the formation of contractile microfilaments. Cytochalasin B: A cytotoxic member of the CYTOCHALASINS. | cytochalasin; lactam; lactone; organic heterotricyclic compound | actin polymerisation inhibitor; metabolite; mycotoxin; platelet aggregation inhibitor |
| pd 166285 | |||
| pd-173952 | |||
| glucopiericidin a | glucopiericidin A: from Streptomyces pactum S48727 as co-metabolite of piericidin A(1); structure given in first source; glycoside antibiotic | ||
| wzb117 | WZB117: structure in first source | ||
| hesperadin |