Target type: cellularcomponent
The extracellular region immediately adjacent to to a synapse. [GOC:dos]
The perisynaptic space is a narrow gap that separates the presynaptic and postsynaptic membranes of a synapse. It is filled with a specialized extracellular matrix (ECM) that is distinct from the ECM found in other parts of the cell. The ECM of the perisynaptic space is composed of a variety of molecules, including proteins, carbohydrates, and lipids. These molecules play a crucial role in regulating the function of the synapse.
The perisynaptic space is a dynamic structure that is constantly being remodeled in response to neuronal activity. This remodeling is essential for maintaining the integrity of the synapse and for adapting to changes in the environment.
The following are some of the key cellular components of the perisynaptic space:
* **Presynaptic membrane:** The presynaptic membrane is the membrane of the presynaptic neuron. It contains a high concentration of synaptic vesicles, which are small sacs that store neurotransmitters.
* **Postsynaptic membrane:** The postsynaptic membrane is the membrane of the postsynaptic neuron. It contains a high concentration of receptors that bind to neurotransmitters released from the presynaptic neuron.
* **Synaptic cleft:** The synaptic cleft is the narrow gap between the presynaptic and postsynaptic membranes. It is filled with the perisynaptic ECM.
* **Perisynaptic ECM:** The perisynaptic ECM is composed of a variety of molecules, including:
* **Proteins:** Proteins in the perisynaptic ECM help to bind the presynaptic and postsynaptic membranes together. They also provide structural support for the synapse and regulate the diffusion of molecules in the synaptic cleft.
* **Carbohydrates:** Carbohydrates in the perisynaptic ECM play a role in cell adhesion and signaling.
* **Lipids:** Lipids in the perisynaptic ECM help to form the barrier between the presynaptic and postsynaptic neurons.
* **Synaptic adhesion molecules:** Synaptic adhesion molecules (SAMs) are a family of proteins that are found in the perisynaptic space. SAMs play a role in regulating the formation and maintenance of synapses.
* **Extracellular matrix proteins:** These proteins provide structural support for the perisynaptic space and help to regulate the diffusion of molecules.
* **Glial cells:** Glial cells are non-neuronal cells that surround synapses. They play a role in supporting the function of neurons and in regulating the environment of the synapse.
* **Perisynaptic astrocytes:** These glial cells are highly specialized and play a significant role in modulating synaptic transmission by controlling the neurotransmitter levels in the synaptic cleft.
* **Perisynaptic microglia:** These glial cells act as immune cells in the brain and are involved in the removal of debris and the regulation of synaptic plasticity.'
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Protein | Definition | Taxonomy |
---|---|---|
Excitatory amino acid transporter 3 | An excitatory amino acid transporter 3 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P43005] | Homo sapiens (human) |
Glutamate receptor 1 | A glutamate receptor 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P42261] | Homo sapiens (human) |
Compound | Definition | Classes | Roles |
---|---|---|---|
aminolevulinic acid | 5-aminolevulinic acid : The simplest delta-amino acid in which the hydrogens at the gamma position are replaced by an oxo group. It is metabolised to protoporphyrin IX, a photoactive compound which accumulates in the skin. Used (in the form of the hydrochloride salt)in combination with blue light illumination for the treatment of minimally to moderately thick actinic keratosis of the face or scalp. Aminolevulinic Acid: A compound produced from succinyl-CoA and GLYCINE as an intermediate in heme synthesis. It is used as a PHOTOCHEMOTHERAPY for actinic KERATOSIS. | 4-oxo monocarboxylic acid; amino acid zwitterion; delta-amino acid | antineoplastic agent; dermatologic drug; Escherichia coli metabolite; human metabolite; mouse metabolite; photosensitizing agent; plant metabolite; prodrug; Saccharomyces cerevisiae metabolite |
5-aminovaleric acid | 5-aminopentanoic acid : A delta-amino acid comprising pentanoic acid with an amino substituent at C-5; a methylene homologue of gamma-aminobutyric acid (GABA) that is a weak GABA agonist. 5-aminovaleric acid: from red fox anal secretion; RN given refers to parent cpd | amino acid zwitterion; delta-amino acid; omega-amino fatty acid | human metabolite |
alanylalanine | alanylalanine: RN given refers to (DL)-isomer | dipeptide | |
alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid | alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid: An IBOTENIC ACID homolog and glutamate agonist. The compound is the defining agonist for the AMPA subtype of glutamate receptors (RECEPTORS, AMPA). It has been used as a radionuclide imaging agent but is more commonly used as an experimental tool in cell biological studies. | non-proteinogenic alpha-amino acid | |
cyclothiazide | cyclothiazide : 3,4-Dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide substituted at positions 3, 5 and 6 by a 2-norbornen-5-yl group, chlorine, and a sulfonamide group, respectively. A thiazide diuretic, it has been used in the management of hypertension and oedema. cyclothiazide: inhibits the desensitization of AMPA-type receptors; structure | benzothiadiazine | antihypertensive agent; diuretic |
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 | |
aspartic acid | aspartic acid : An alpha-amino acid that consists of succinic acid bearing a single alpha-amino substituent Aspartic Acid: One of the non-essential amino acids commonly occurring in the L-form. It is found in animals and plants, especially in sugar cane and sugar beets. It may be a neurotransmitter. L-aspartic acid : The L-enantiomer of aspartic acid. | aspartate family amino acid; aspartic acid; L-alpha-amino acid; proteinogenic amino acid | Escherichia coli metabolite; mouse metabolite; neurotransmitter |
kainic acid | Kainic Acid: (2S-(2 alpha,3 beta,4 beta))-2-Carboxy-4-(1-methylethenyl)-3-pyrrolidineacetic acid. Ascaricide obtained from the red alga Digenea simplex. It is a potent excitatory amino acid agonist at some types of excitatory amino acid receptors and has been used to discriminate among receptor types. Like many excitatory amino acid agonists it can cause neurotoxicity and has been used experimentally for that purpose. | dicarboxylic acid; L-proline derivative; non-proteinogenic L-alpha-amino acid; pyrrolidinecarboxylic acid | antinematodal drug; excitatory amino acid agonist |
glycylglycine | dipeptide; dipeptide zwitterion | human metabolite | |
glutamic acid | glutamic acid : An alpha-amino acid that is glutaric acid bearing a single amino substituent at position 2. Glutamic Acid: A non-essential amino acid naturally occurring in the L-form. Glutamic acid is the most common excitatory neurotransmitter in the CENTRAL NERVOUS SYSTEM. | glutamic acid; glutamine family amino acid; L-alpha-amino acid; proteinogenic amino acid | Escherichia coli metabolite; ferroptosis inducer; micronutrient; mouse metabolite; neurotransmitter; nutraceutical |
selfotel | selfotel: a N-methyl-D-aspartate (NMDA) antagonist; used to treat stroke-induced impairment | non-proteinogenic alpha-amino acid | |
leucyl-alanine | Leu-Ala : A dipeptide composed of L-leucine and L-alanine joined by a peptide linkage. | dipeptide | metabolite |
alanylproline | alanylproline: RN given refers to all (L)-isomer | dipeptide; dipeptide zwitterion | metabolite |
glycylleucine | Gly-Leu : A dipeptide composed of glycine and L-leucine joined by a peptide linkage. | dipeptide; dipeptide zwitterion | metabolite |
alanyltyrosine | Ala-Tyr : A dipeptide composed of L-alanine and L-tyrosine joined by a peptide linkage. alanyltyrosine: tyrosine source; RN given refers to (L)-isomer | dipeptide | metabolite |
glycylsarcosine | glycylsarcosine : A dipeptide obtained by formal condensation of the carboxy group of glycine with the amino group of sarcosine. | dipeptide; dipeptide zwitterion | |
sym 2081 | |||
glycylaspartic acid | glycylaspartic acid: RN given refers to (L)-isomer | dipeptide | metabolite |
histidinoalanine | histidinoalanine: cross-linking amino acid in calcified tissue collagen; RN given refers to (L)-isomer | dipeptide; dipeptide zwitterion | metabolite |
dihydrokainate | dicarboxylic acid | ||
jstx-3 | JSTX-3: structure in first source | N-acyl-amino acid | |
argiotoxin-636 | argiotoxin-636: from the venom of Argiope aurantia; blocks neuromuscular transmission in insects; structure in first source. | N-acyl-amino acid | |
2-amino-3-(3-(carboxymethoxy)-5-methylisoxazol-4-yl)propionic acid | 2-amino-3-(3-(carboxymethoxy)-5-methylisoxazol-4-yl)propionic acid: glutamate receptor antagonist; protects against kainic acid neurotoxicity in cultured cerebral cortex neurons | ||
5-fluorowillardiine | 3-(5-fluorouracil-1-yl)-L-alanine : An alanine derivative that is L-alanine bearing a 5-fluorouracil-1-yl substituent at position 3. A more potent and selective AMPA receptor agonist (at hGluR1 and hGluR2) than AMPA itself (Ki = 14.7, 25.1, and 1820 nM for hGluR1, hGluR2 and hGluR5 respectively). 5-fluorowillardiine: a glutamate agonist; RN given for (S)-isomer | L-alanine derivative; non-proteinogenic L-alpha-amino acid; organofluorine compound | AMPA receptor agonist |
gyki 53655 | GYKI 53655: an AMPA (alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate) receptor antagonist | ||
ly 293558 | tezampanel: structure given in first source; an AMPA receptor antagonist | ||
alanylglutamic acid | alanylglutamic acid: RN given refers to (L)-isomer L-alanyl-L-glutamic acid : A dipeptide consisting of L-glutamic acid having an L-alanyl attached to its alpha-amino group | dipeptide | |
prolyl-tyrosine | Pro-Tyr : A dipeptide formed from L-proline and L-tyrosine residues. prolyl-tyrosine: structure given in first source | dipeptide | metabolite |
alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid | |||
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 | |
5-bromowillardiine | 5-bromowillardiine: acts as a kainate-like agonist on chick EAA receptors expressed in Xenopus oocytes; RN given refers to (S)-isomer; RN for cpd without isomeric designation not avail 5/91 | ||
prolylglutamic acid | Pro-Glu : A dipeptide formed from L-proline and L-glutamic acid residues. | dipeptide | metabolite |
cysteinylglycine | cysteinylglycine: RN given refers to (L)-isomer; RN for cpd without isomeric designation not in Chemlne 7/13/83 L-cysteinylglycine : A dipeptide consisting of glycine having an L-cysteinyl attached to its alpha-amino group. It is an intermediate metabolite in glutathione metabolism. | dipeptide; dipeptide zwitterion | Escherichia coli metabolite; human metabolite; Saccharomyces cerevisiae metabolite |
willardiine | 3-(uracil-1-yl)-L-alanine : The 3-(uracil-1-yl) derivative of L-alanine. willardiine: isolated from seeds of Acacia willariana; structure | amino acid zwitterion; L-alanine derivative; non-proteinogenic L-alpha-amino acid | |
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 |
3-hydroxyaspartic acid, (threo-l)-isomer | (3S)-3-hydroxy-L-aspartic acid : The (3S)-diastereomer of 3-hydroxy-L-aspartic acid. | 3-hydroxy-L-aspartic acid | metabolite |
(S)-ATPA | (S)-ATPA : A non-proteinogenic L-alpha-amino acid that is L-alanine in which one of the methyl hydrogens is replaced by a 5-tert-butyl-3-hydroxy-isooxazol-4-yl group. | isoxazoles; non-proteinogenic L-alpha-amino acid | metabolite |
aspartyl-aspartic acid | Asp-Asp : A dipeptide formed from two L-aspartic acid units. aspartyl-aspartic acid: do not confuse with cyclo(Asp-Asp) | dipeptide | Mycoplasma genitalium metabolite |
4-bromohomoibotenic acid, (rs)-isomer | |||
glycylproline | Gly-Pro : A dipeptide consisting of L-proline having a glycyl residue attached to its alpha-amino group. | dipeptide; dipeptide zwitterion | metabolite |
2,3-dioxo-6-nitro-7-sulfamoylbenzo(f)quinoxaline | 2,3-dioxo-6-nitro-7-sulfamoylbenzo(f)quinoxaline: structure given in first source; neuroprotectant for cerebral ischemia; AMPA receptor antagonist | naphthalenes; sulfonic acid derivative | |
6-cyano-7-nitroquinoxaline-2,3-dione | 6-Cyano-7-nitroquinoxaline-2,3-dione: A potent excitatory amino acid antagonist with a preference for non-NMDA iontropic receptors. It is used primarily as a research tool. | quinoxaline derivative | |
fg 9041 | FG 9041: structure given in first source | quinoxaline derivative | |
2-amino-3-phenylmethoxybutanedioic acid | aspartic acid derivative | ||
seryl-proline | Ser-Pro : A dipeptide formed from L-serine and L-proline residues. | dipeptide | metabolite |
dl-threo-beta-benzyloxyaspartate | |||
lofepramine hydrochloride | |||
phenylalanylalanine | Phe-Ala : A dipeptide formed from L-phenylalanine and L-alanine residues. phenylalanylalanine: RN given refers to (L)-isomer | dipeptide; dipeptide zwitterion | metabolite |
acetylalanylalanine | acetylalanylalanine: RN given refers to (D)-isomer | ||
alpha-aspartylalanine | alpha-aspartylalanine: found in pig brain Asp-Ala : A dipeptide formed from L-alpha-aspartyl and L-valine residues. | dipeptide | metabolite |
alanyltyrosine | Tyr-Ala : A dipeptide formed from L-tyrosine and L-alanine residues. | dipeptide | metabolite |
prolylglycine | L-prolylglycine : A dipeptide consisting of glycine having an L-prolyl group attached to its alpha-amino nitrogen. prolylglycine: RN given refers to (L)-isomer | dipeptide; dipeptide zwitterion | |
cx 614 | 2H,3H,6aH-pyrrolidino(2'',1''-3',2')1,3-oxazino(6',5'-5,4)benzo(e)1, 4-dioxan-10-one: an ampakine (AMPA receptor modulator); structure in first source | ||
glutamylalanine | Glu-Ala : A dipeptide formed from L-alpha-glutamyl and L-alanine residues. | dipeptide | metabolite |
phenylalanylphenylalanine | Phe-Phe : A dipeptide formed from two L-phenylalanine residues. | dipeptide; L-aminoacyl-L-amino acid zwitterion | human blood serum metabolite; Mycoplasma genitalium metabolite |
phenylalanyl-valine | Val-Phe : A dipeptide formed from L-valine and L-phenylalanine residues. | dipeptide | metabolite |
alanylglycine | dipeptide; dipeptide zwitterion | metabolite | |
valyltyrosine | Val-Tyr : A dipeptide formed from L-valine and L-tyrosine residues. valyltyrosine: from sardine muscle hydrolyzate | dipeptide | metabolite |
phenylalanylproline | Phe-Pro : A dipeptide formed from L-phenylalanine and L-proline residues. | dipeptide | metabolite |
glycylhistidine | Gly-His : A dipeptide composed of glycine and L-histidine joined by a peptide linkage. glycylhistidine: RN given refers to (L)-isomer | dipeptide; dipeptide zwitterion | metabolite |
prolyl-serine | Pro-Ser : A dipeptide formed from L-proline and L-serine residues. | dipeptide | metabolite |
prolylvaline | Val-Pro : A dipeptide formed from L-valine and L-proline residues. | dipeptide | metabolite |
tqx 173 | |||
perampanel | perampanel : A member of the class of bipyridines that is 2,3'-bipyridin-6'-one substituted at positions 1' and 5' by phenyl and 2-cyanophenyl groups respectively. Used as an adjunctive therapy for the treatment of partial-onset seizures in patients with epilepsy. | bipyridines; nitrile; pyridone | AMPA receptor antagonist; anticonvulsant |
ly 404187 | LY 404187: structure in first source | ||
l-beta-threo-benzyl-aspartate | L-beta-threo-benzyl-aspartate: structure in first source | ||
ucph 101 | 2-amino-4-(4-methoxyphenyl)-7-(naphthalen-1-yl)-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile: structure in first source |