Target type: biologicalprocess
The process in which an amino acid is transported across a membrane. [GOC:dph, GOC:tb]
Amino acid transmembrane transport is a fundamental cellular process that allows amino acids, the building blocks of proteins, to move across the cell membrane. This movement is essential for a variety of cellular functions, including protein synthesis, nutrient uptake, and waste removal.
Amino acid transport occurs through specialized transmembrane proteins called amino acid transporters. These proteins act as selective gates, facilitating the passage of specific amino acids across the membrane while excluding others.
There are two main mechanisms of amino acid transport:
1. **Active transport:** This mechanism requires energy to move amino acids against their concentration gradient, meaning from an area of low concentration to an area of high concentration. This energy is often supplied by ATP hydrolysis. Active transport is crucial for maintaining the proper intracellular concentrations of amino acids, which is necessary for optimal cellular function.
2. **Passive transport:** This mechanism does not require energy and relies on the concentration gradient of the amino acid. Amino acids move from an area of high concentration to an area of low concentration. Passive transport is less common for amino acid transport compared to active transport.
Amino acid transporters can be classified based on their substrate specificity and transport mechanism. Some transporters are highly specific, only transporting a single amino acid. Others are less specific, transporting multiple amino acids.
The transport process can be influenced by various factors, including:
* **The type of amino acid:** Different amino acids have different affinities for specific transporters.
* **The concentration gradient:** The difference in concentration between the inside and outside of the cell affects the rate of transport.
* **The presence of other molecules:** Some molecules can compete with amino acids for binding to transporters, affecting the transport rate.
The proper functioning of amino acid transporters is essential for cell survival. Disruptions in amino acid transport can lead to various diseases, including genetic disorders affecting protein synthesis and metabolic diseases related to nutrient uptake.
In conclusion, amino acid transmembrane transport is a complex process involving specialized transmembrane proteins that move amino acids across the cell membrane. This movement is essential for maintaining cellular function and is critical for a variety of biological processes. Understanding the mechanisms of amino acid transport is crucial for advancing our understanding of cellular physiology and developing novel therapeutic strategies for diseases related to this process.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Cystine/glutamate transporter | A cystine/glutamate transporter that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9UPY5] | Homo sapiens (human) |
| Large neutral amino acids transporter small subunit 1 | A large neutral amino acids transporter small subunit 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q01650] | Homo sapiens (human) |
| Sodium-dependent neutral amino acid transporter B(0)AT2 | A sodium-dependent neutral amino acid transporter B(0)AT2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9H2J7] | Homo sapiens (human) |
| Sodium- and chloride-dependent GABA transporter 3 | A sodium- and chloride-dependent GABA transporter 3 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P48066] | Homo sapiens (human) |
| Sodium- and chloride-dependent betaine transporter | A sodium- and chloride-dependent betaine transporter that is encoded in the genome of human. [PRO:DNx, UniProtKB:P48065] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| gamma-aminobutyric acid | gamma-aminobutyric acid : A gamma-amino acid that is butanoic acid with the amino substituent located at C-4. gamma-Aminobutyric Acid: The most common inhibitory neurotransmitter in the central nervous system. | amino acid zwitterion; gamma-amino acid; monocarboxylic acid | human metabolite; neurotransmitter; Saccharomyces cerevisiae metabolite; signalling molecule |
| beta-alanine | amino acid zwitterion; beta-amino acid | agonist; fundamental metabolite; human metabolite; inhibitor; neurotransmitter | |
| 2,3-diaminopropionic acid | 3-aminoalanine : A diamino acid that is alanine in which one of the hydrogens of the methyl group is replaced by an amino group. | alanine derivative; amino acid zwitterion; beta-amino acid; diamino acid; non-proteinogenic alpha-amino acid | Escherichia coli metabolite |
| glycine | alpha-amino acid; amino acid zwitterion; proteinogenic amino acid; serine family amino acid | EC 2.1.2.1 (glycine hydroxymethyltransferase) inhibitor; fundamental metabolite; hepatoprotective agent; micronutrient; neurotransmitter; NMDA receptor agonist; nutraceutical | |
| guvacine | guvacine : A alpha,beta-unsaturated monocarboxylic acid that is nicotinic acid which has been hydrogenated at the 1-2 and 5-6 positions of the pyridine ring. guvacine: RN given refers to parent cpd | alpha,beta-unsaturated monocarboxylic acid; beta-amino acid; pyridine alkaloid; secondary amino compound; tetrahydropyridine | GABA reuptake inhibitor; plant metabolite |
| loratadine | loratadine : A benzocycloheptapyridine that is 6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridine substituted by a chloro group at position 8 and a 1-(ethoxycarbonyl)piperidin-4-ylidene group at position 11. It is a H1-receptor antagonist commonly employed in the treatment of allergic disorders. Loratadine: A second-generation histamine H1 receptor antagonist used in the treatment of allergic rhinitis and urticaria. Unlike most classical antihistamines (HISTAMINE H1 ANTAGONISTS) it lacks central nervous system depressing effects such as drowsiness. | benzocycloheptapyridine; ethyl ester; N-acylpiperidine; organochlorine compound; tertiary carboxamide | anti-allergic agent; cholinergic antagonist; geroprotector; H1-receptor antagonist |
| mesalamine | mesalamine : A monohydroxybenzoic acid that is salicylic acid substituted by an amino group at the 5-position. Mesalamine: An anti-inflammatory agent, structurally related to the SALICYLATES, which is active in INFLAMMATORY BOWEL DISEASE. It is considered to be the active moiety of SULPHASALAZINE. (From Martindale, The Extra Pharmacopoeia, 30th ed) | amino acid; aromatic amine; monocarboxylic acid; monohydroxybenzoic acid; phenols | non-steroidal anti-inflammatory drug |
| nipecotic acid | nipecotic acid : A piperidinemonocarboxylic acid that is piperidine in which one of the hydrogens at position 3 is substituted by a carboxylic acid group. nipecotic acid: RN given refers to cpd without isomeric designation | beta-amino acid; piperidinemonocarboxylic acid | |
| sulfapyridine | sulfapyridine : A sulfonamide consisting of pyridine with a 4-aminobenzenesulfonamido group at the 2-position. Sulfapyridine: Antibacterial, potentially toxic, used to treat certain skin diseases. | pyridines; substituted aniline; sulfonamide; sulfonamide antibiotic | antiinfective agent; dermatologic drug; drug allergen; environmental contaminant; xenobiotic |
| sulfasalazine | sulfasalazine : An azobenzene consisting of diphenyldiazene having a carboxy substituent at the 4-position, a hydroxy substituent at the 3-position and a 2-pyridylaminosulphonyl substituent at the 4'-position. Sulfasalazine: A drug that is used in the management of inflammatory bowel diseases. Its activity is generally considered to lie in its metabolic breakdown product, 5-aminosalicylic acid (see MESALAMINE) released in the colon. (From Martindale, The Extra Pharmacopoeia, 30th ed, p907) | ||
| cysteine | cysteine; cysteine zwitterion; L-alpha-amino acid; proteinogenic amino acid; serine family amino acid | EC 4.3.1.3 (histidine ammonia-lyase) inhibitor; flour treatment agent; human metabolite | |
| levodopa | L-dopa : An optically active form of dopa having L-configuration. Used to treat the stiffness, tremors, spasms, and poor muscle control of Parkinson's disease Levodopa: The naturally occurring form of DIHYDROXYPHENYLALANINE and the immediate precursor of DOPAMINE. Unlike dopamine itself, it can be taken orally and crosses the blood-brain barrier. It is rapidly taken up by dopaminergic neurons and converted to DOPAMINE. It is used for the treatment of PARKINSONIAN DISORDERS and is usually given with agents that inhibit its conversion to dopamine outside of the central nervous system. | amino acid zwitterion; dopa; L-tyrosine derivative; non-proteinogenic L-alpha-amino acid | allelochemical; antidyskinesia agent; antiparkinson drug; dopaminergic agent; hapten; human metabolite; mouse metabolite; neurotoxin; plant growth retardant; plant metabolite; prodrug |
| tyrosine | tyrosine : An alpha-amino acid that is phenylalanine bearing a hydroxy substituent at position 4 on the phenyl ring. Tyrosine: A non-essential amino acid. In animals it is synthesized from PHENYLALANINE. It is also the precursor of EPINEPHRINE; THYROID HORMONES; and melanin. | amino acid zwitterion; erythrose 4-phosphate/phosphoenolpyruvate family amino acid; L-alpha-amino acid; proteinogenic amino acid; tyrosine | EC 1.3.1.43 (arogenate dehydrogenase) inhibitor; fundamental metabolite; micronutrient; nutraceutical |
| leucine | leucine : A branched-chain amino acid that consists of glycine in which one of the hydrogens attached to the alpha-carbon is substituted by an isobutyl group. Leucine: An essential branched-chain amino acid important for hemoglobin formation. | amino acid zwitterion; L-alpha-amino acid; leucine; proteinogenic amino acid; pyruvate family amino acid | algal metabolite; Escherichia coli metabolite; human metabolite; mouse metabolite; plant metabolite; Saccharomyces cerevisiae metabolite |
| methionine | methionine : A sulfur-containing amino acid that is butyric acid bearing an amino substituent at position 2 and a methylthio substituent at position 4. Methionine: A sulfur-containing essential L-amino acid that is important in many body functions. | aspartate family amino acid; L-alpha-amino acid; methionine; methionine zwitterion; proteinogenic amino acid | antidote to paracetamol poisoning; human metabolite; micronutrient; mouse metabolite; nutraceutical |
| phenylalanine | L-phenylalanine : The L-enantiomer of phenylalanine. phenylalanine : An aromatic amino acid that is alanine in which one of the methyl hydrogens is substituted by a phenyl group. Phenylalanine: An essential aromatic amino acid that is a precursor of MELANIN; DOPAMINE; noradrenalin (NOREPINEPHRINE), and THYROXINE. | amino acid zwitterion; erythrose 4-phosphate/phosphoenolpyruvate family amino acid; L-alpha-amino acid; phenylalanine; proteinogenic amino acid | algal metabolite; EC 3.1.3.1 (alkaline phosphatase) inhibitor; Escherichia coli metabolite; human xenobiotic metabolite; micronutrient; mouse metabolite; nutraceutical; plant metabolite; Saccharomyces cerevisiae metabolite |
| histidine | histidine : An alpha-amino acid that is propanoic acid bearing an amino substituent at position 2 and a 1H-imidazol-4-yl group at position 3. Histidine: An essential amino acid that is required for the production of HISTAMINE. L-histidine : The L-enantiomer of the amino acid histidine. | amino acid zwitterion; histidine; L-alpha-amino acid; polar amino acid zwitterion; proteinogenic amino acid | algal metabolite; Escherichia coli metabolite; human metabolite; micronutrient; mouse metabolite; nutraceutical; Saccharomyces cerevisiae metabolite |
| valine | L-valine : The L-enantiomer of valine. valine : A branched-chain amino acid that consists of glycine in which one of the hydrogens attached to the alpha-carbon is substituted by an isopropyl group. Valine: A branched-chain essential amino acid that has stimulant activity. It promotes muscle growth and tissue repair. It is a precursor in the penicillin biosynthetic pathway. | L-alpha-amino acid; L-alpha-amino acid zwitterion; proteinogenic amino acid; pyruvate family amino acid; valine | algal metabolite; Escherichia coli metabolite; human metabolite; micronutrient; mouse metabolite; nutraceutical; Saccharomyces cerevisiae metabolite |
| tryptophan | tryptophan : An alpha-amino acid that is alanine bearing an indol-3-yl substituent at position 3. Tryptophan: An essential amino acid that is necessary for normal growth in infants and for NITROGEN balance in adults. It is a precursor of INDOLE ALKALOIDS in plants. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid). It can be a precursor to NIACIN, albeit inefficiently, in mammals. | erythrose 4-phosphate/phosphoenolpyruvate family amino acid; L-alpha-amino acid; L-alpha-amino acid zwitterion; proteinogenic amino acid; tryptophan; tryptophan zwitterion | antidepressant; Escherichia coli metabolite; human metabolite; micronutrient; mouse metabolite; nutraceutical; plant metabolite; Saccharomyces cerevisiae metabolite |
| isoleucine | isoleucine : A 2-amino-3-methylpentanoic acid having either (2R,3R)- or (2S,3S)-configuration. Isoleucine: An essential branched-chain aliphatic amino acid found in many proteins. It is an isomer of LEUCINE. It is important in hemoglobin synthesis and regulation of blood sugar and energy levels. L-isoleucine : The L-enantiomer of isoleucine. | aspartate family amino acid; isoleucine; L-alpha-amino acid; L-alpha-amino acid zwitterion; proteinogenic amino acid | algal metabolite; Escherichia coli metabolite; human metabolite; mouse metabolite; plant metabolite; Saccharomyces cerevisiae metabolite |
| D-tryptophan | D-alpha-amino acid; tryptophan; tryptophan zwitterion | bacterial metabolite | |
| quisqualic acid | Quisqualic Acid: An agonist at two subsets of excitatory amino acid receptors, ionotropic receptors that directly control membrane channels and metabotropic receptors that indirectly mediate calcium mobilization from intracellular stores. The compound is obtained from the seeds and fruit of Quisqualis chinensis. | non-proteinogenic alpha-amino acid | |
| tiagabine | tiagabine : A piperidinemonocarboxylic acid that is (R)-nipecotic acid in which the hydrogen attached to the nitrogen has been replaced by a 1,1-bis(3-methyl-2-thienyl)but-1-en-4-yl group. A GABA reuptake inhibitor, it is used (generally as the hydrochloride salt) for the treatment of epilepsy. Tiagabine: A nipecotic acid derivative that acts as a GABA uptake inhibitor and anticonvulsant agent. It is used in the treatment of EPILEPSY, for refractory PARTIAL SEIZURES. | beta-amino acid; piperidinemonocarboxylic acid; tertiary amino compound; thiophenes | anticonvulsant; GABA reuptake inhibitor |
| sch 37370 | N-acetyldesloratadine: dual antagonist of platelet-activating factor and histamine | ||
| copper histidine | D-alpha-amino acid; histidine; polar amino acid zwitterion | Saccharomyces cerevisiae metabolite | |
| D-tyrosine | D-alpha-amino acid; D-alpha-amino acid zwitterion; tyrosine | Escherichia coli metabolite | |
| D-valine | D-valine : The D-enantiomer of valine. | D-alpha-amino acid; D-alpha-amino acid zwitterion; valine | |
| phenylalanine | D-alpha-amino acid; D-alpha-amino acid zwitterion; phenylalanine | ||
| 1-methylhistidine | 1-methylhistidine : A methylhistidine in which the methyl group is located at N-1. 1-methylhistidine: found in muscle proteins; RN given refers to (L)-isomer N(tele)-methyl-L-histidine : A L-histidine derivative in which the methyl group is at N(tele)-position. | L-histidine derivative; non-proteinogenic L-alpha-amino acid; zwitterion | human metabolite |
| 2-aminobicyclo(2,2,1)heptane-2-carboxylic acid | 2-aminobicyclo(2,2,1)heptane-2-carboxylic acid: amino acid analog; releases insulin; RN given refers to unlabeled cpd without isomeric designation | monoterpenoid | |
| desloratadine | desloratadine : Loratadine in which the ethoxycarbonyl group attached to the piperidine ring is replaced by hydrogen. The major metabolite of loratidine, desloratadine is an antihistamine which is used for the symptomatic relief of allergic conditions including rhinitis and chronic urticaria. It does not readily enter the central nervous system, so does not cause drowsiness. desloratadine: major metabolite of loratadine | benzocycloheptapyridine | anti-allergic agent; cholinergic antagonist; drug metabolite; H1-receptor antagonist |
| rupatadine | rupatadine: structure given in first source; RN given refers to trihydrochloride | benzocycloheptapyridine | |
| serine o-sulfate | L-serine O-sulfate : A non-proteinogenic L-alpha-amino acid that is the O-sulfo derivative of L-serine. serine O-sulfate: RN given refers to (L)-isomer | L-serine derivative; non-proteinogenic L-alpha-amino acid; O-sulfoamino acid | |
| homocysteic acid | homocysteic acid : A non-proteinogenic alpha-amino acid that is homocysteine in which the thiol group has benn oxidised to the corresponding sulfonic acid. homocysteic acid: promotes growth in hypophysectomized rats; RN given refers to parent cpd L-homocysteic acid : A homocysteic acid with L-configuration. | homocysteic acid | NMDA receptor agonist |
| ci 966 | CI 966: GABA uptake blocker; RN from Toxlit | diarylmethane | |
| D-leucine | D-alpha-amino acid; D-alpha-amino acid zwitterion; leucine | bacterial metabolite; Saccharomyces cerevisiae metabolite | |
| hinokinin | hinokinin : A lignan that is dihydrofuran-2(3H)-one (gamma-butyrolactone) substituted by a 3,4-methylenedioxybenzyl group at positions 3 and 4 (the 3R,4R-diastereoisomer). hinokinin: suppresses expression of both HBsAg and HBeAg | benzodioxoles; gamma-lactone; lignan | trypanocidal drug |
| n-(1-benzyl-4-piperidinyl)-2,4-dichlorobenzamide | N-(1-benzyl-4-piperidinyl)-2,4-dichlorobenzamide: inhibits the betaine-GABA transporter 1; structure in first source | ||
| nipecotic acid | (R)-nipecotic acid : The (R)-enantiopmer of nipecotic acid. | amino acid zwitterion; nipecotic acid | |
| susalimod | susalimod: analogue of sulphasalazine, was designed for use in the treatment of rheumatoid arthritis | ||
| nipecotic acid, (s)-isomer | (S)-nipecotic acid : The (S)-enantiomer of nipecotic acid. | nipecotic acid | |
| 3-tyrosine | 3-tyrosine: RN given refers to cpd with unspecified isomeric designation L-m-tyrosine : A hydroxyphenylalanine that is L-phenylalanine with a substituent hydroxy group at position 3. | hydroxyphenylalanine; L-alpha-amino acid zwitterion; L-phenylalanine derivative; non-proteinogenic L-alpha-amino acid; phenols | plant metabolite |
| 2-ethoxy-N-[1-(phenylmethyl)-4-piperidinyl]benzamide | piperidines | ||
| nnc 05-2090 | NNC 05-2090: structure given in first source | carbazoles | |
| snap 5114 | |||
| erastin | erastin : A member of the class of quinazolines that is quinazolin-4(3H)-one in which the hydrogens at positions 2 and 3 are replaced by 1-{4-[(4-chlorophenoxy)acetyl]piperazin-1-yl}ethyl and 2-ethoxyphenyl groups, respectively. It is an inhibitor of voltage-dependent anion-selective channels (VDAC2 and VDAC3) and a potent ferroptosis inducer. erastin: an antineoplastic agent; structure in first source | aromatic ether; diether; monochlorobenzenes; N-acylpiperazine; N-alkylpiperazine; quinazolines; tertiary carboxamide | antineoplastic agent; ferroptosis inducer; voltage-dependent anion channel inhibitor |