photoreceptor ribbon synapse
Definition
Target type: cellularcomponent
A ribbon synapse between a retinal photoreceptor cell (rod or cone) and a retinal bipolar cell. These contain a plate-like synaptic ribbon. [PMID:15626493]
The photoreceptor ribbon synapse is a specialized synapse found in the retina, responsible for transmitting signals from photoreceptor cells to bipolar cells. The cellular component of this synapse is highly structured and can be divided into distinct elements:
**1. Presynaptic terminal of the photoreceptor:** This is the site where neurotransmitter release occurs. It contains:
* **Ribbon:** A dense protein structure shaped like a ribbon that acts as a scaffold for synaptic vesicles. The ribbon is anchored to the plasma membrane and is essential for sustained neurotransmitter release.
* **Synaptic vesicles:** These small, membrane-bound organelles contain the neurotransmitter glutamate, which is released into the synaptic cleft.
* **Active zones:** Specialized regions of the plasma membrane where synaptic vesicles dock and release their neurotransmitter.
* **Ca2+ channels:** These channels are responsible for the influx of calcium ions into the presynaptic terminal, which triggers the release of synaptic vesicles.
**2. Synaptic cleft:** The space between the presynaptic terminal and the postsynaptic membrane of the bipolar cell.
**3. Postsynaptic membrane of the bipolar cell:** This membrane contains receptors that bind to the released glutamate, initiating a signal in the bipolar cell.
**4. Supporting cells:** These cells, including Müller glia, surround the photoreceptor synapse and provide structural support and regulate the extracellular environment.
**5. Other proteins:** A complex array of proteins, including scaffolding proteins, signaling molecules, and enzymes, are present at the synapse and play a role in regulating synaptic transmission.
**Overall, the cellular component of the photoreceptor ribbon synapse is a highly organized and dynamic structure that ensures efficient and sustained signal transmission from photoreceptors to bipolar cells, ultimately contributing to the processing of visual information.**'
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Proteins (3)
| Protein | Definition | Taxonomy |
|---|---|---|
| Voltage-dependent L-type calcium channel subunit beta-2 | A voltage-dependent L-type calcium channel subunit beta-2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q08289] | Homo sapiens (human) |
| Dynamin-1 | A dynamin-1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q05193] | Homo sapiens (human) |
| Heat shock cognate 71 kDa protein | A heat shock cognate 71 kDa protein that is encoded in the genome of human. [PRO:DAN] | Homo sapiens (human) |
Compounds (26)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| tacrine | tacrine : A member of the class of acridines that is 1,2,3,4-tetrahydroacridine substituted by an amino group at position 9. It is used in the treatment of Alzheimer's disease. Tacrine: A cholinesterase inhibitor that crosses the blood-brain barrier. Tacrine has been used to counter the effects of muscle relaxants, as a respiratory stimulant, and in the treatment of Alzheimer's disease and other central nervous system disorders. | acridines; aromatic amine | EC 3.1.1.7 (acetylcholinesterase) inhibitor |
| nimodipine | nimodipine : A dihydropyridine that is 1,4-dihydropyridine which is substituted by methyl groups at positions 2 and 6, a (2-methoxyethoxy)carbonyl group at position 3, a m-nitrophenyl group at position 4, and an isopropoxycarbonyl group at position 5. An L-type calcium channel blocker, it acts particularly on cerebral circulation, and is used both orally and intravenously for the prevention and treatment of subarachnoid hemorrhage from ruptured intracranial aneurysm. Nimodipine: A calcium channel blockader with preferential cerebrovascular activity. It has marked cerebrovascular dilating effects and lowers blood pressure. | 2-methoxyethyl ester; C-nitro compound; dicarboxylic acids and O-substituted derivatives; diester; dihydropyridine; isopropyl ester | antihypertensive agent; calcium channel blocker; cardiovascular drug; vasodilator agent |
| cetrimonium bromide | cetyltrimethylammonium bromide : The organic bromide salt that is the bromide salt of cetyltrimethylammonium; one of the components of the topical antiseptic cetrimide. | organic bromide salt; quaternary ammonium salt | detergent; surfactant |
| adenosine diphosphate | Adenosine Diphosphate: Adenosine 5'-(trihydrogen diphosphate). An adenine nucleotide containing two phosphate groups esterified to the sugar moiety at the 5'-position. | adenosine 5'-phosphate; purine ribonucleoside 5'-diphosphate | fundamental metabolite; human metabolite |
| tubercidin | tubercidin : An N-glycosylpyrrolopyrimidine that is adenosine in which the in the 5-membered ring that is not attached to the ribose moiety is replaced by a carbon. Tubercidin is produced in the culture broth of Streptomyces tubericidus. Tubercidin: An antibiotic purine ribonucleoside that readily substitutes for adenosine in the biological system, but its incorporation into DNA and RNA has an inhibitory effect on the metabolism of these nucleic acids. | antibiotic antifungal agent; N-glycosylpyrrolopyrimidine; ribonucleoside | antimetabolite; antineoplastic agent; bacterial metabolite |
| n,n-dimethyl-1-dodecanamine | N,N-dimethyl-1-dodecanamine: increases body weight & feed efficiency in animals; RN given refers to parent cpd | ||
| decylamine | decylamine: structure | alkylamine | |
| myristic acid | Myristic Acid: A saturated 14-carbon fatty acid occurring in most animal and vegetable fats, particularly butterfat and coconut, palm, and nutmeg oils. It is used to synthesize flavor and as an ingredient in soaps and cosmetics. (From Dorland, 28th ed) tetradecanoate : A long-chain fatty acid anion that is the conjugate base of myristic acid; major species at pH 7.3. tetradecanoic acid : A straight-chain, fourteen-carbon, long-chain saturated fatty acid mostly found in milk fat. | long-chain fatty acid; straight-chain saturated fatty acid | algal metabolite; Daphnia magna metabolite; EC 3.1.1.1 (carboxylesterase) inhibitor; human metabolite |
| toyocamycin | toyocamycin : An N-glycosylpyrrolopyrimidine that is tubercidin in which the hydrogen at position 5 of the pyrrolopyrimidine moiety has been replaced by a cyano group. Toyocamycin: 4-Amino-5-cyano-7-(D-ribofuranosyl)-7H- pyrrolo(2,3-d)pyrimidine. Antibiotic antimetabolite isolated from Streptomyces toyocaensis cultures. It is an analog of adenosine, blocks RNA synthesis and ribosome function, and is used mainly as a tool in biochemistry. | antibiotic antifungal agent; N-glycosylpyrrolopyrimidine; nitrile; ribonucleoside | antimetabolite; antineoplastic agent; apoptosis inducer; bacterial metabolite |
| dodecylamine | dodecylamine: RN given refers to parent cpd | primary aliphatic amine | |
| dodecyltrimethylammonium bromide | dodecyltrimethylammonium bromide : A quarternary ammonium cation having one dodecyl and three methyl substituents around the central nitrogen. | bromide salt; quaternary ammonium salt | surfactant |
| nsc 65346 | sangivamycin : A nucleoside analogue that is adenosine in which the nitrogen at position 7 is replaced by a carbamoyl-substituted carbon. It is a potent inhibitor of protein kinase C. sangivamycin: RN given refers to parent cpd | nucleoside analogue | protein kinase inhibitor |
| stearylamine | octadecan-1-amine : An 18-carbon primary aliphatic amine. stearylamine: RN given refers to parent cpd | primary aliphatic amine | film-forming compound |
| n-tetradecylamine | N-tetradecylamine: RN given refers to parent cpd | alkylamine | |
| 1,12-dodecamethylenediamine | 1,12-dodecamethylenediamine: RN given refers to parent cpd dodecane-1,12-diamine : An alkane-alpha,omega-diamine that is dodecane substituted by amino groups at positions 1 and 12. | alkane-alpha,omega-diamine | |
| adenosine | quinquefolan B: isolated from roots of Panax quinquefolium L.; RN not in Chemline 10/87; RN from Toxlit | adenosines; purines D-ribonucleoside | analgesic; anti-arrhythmia drug; fundamental metabolite; human metabolite; vasodilator agent |
| stearyltrimethylammonium bromide | octadecyltrimethylammonium bromide: structure in first source | ||
| 8-aminoadenosine | |||
| 5'-deoxyadenosine | 5'-deoxyadenosine : A 5'-deoxyribonucleoside compound having adenosine as the nucleobase. 5'-deoxyadenosine: main heading DEOXYADENOSINE refers to the 3' cpd | 5'-deoxyribonucleoside; adenosines | Escherichia coli metabolite; human metabolite; mouse metabolite |
| ag-213 | tyrphostin 47: inhibits protein-tyrosine kinase activity of EGF-R both in vitro and in living cells; | ||
| ag 99 | tyrphostin A46: epidermal growth factor-urogastrone receptor antagonist | ||
| ith 4012 | |||
| ver 155008 | VER 155008: structure in first source | purine nucleoside | |
| dynole 34-2 | dynole 34-2: a dynamin inhibitor; structure in first source | ||
| n'-(3,4-dihydroxybenzylidene)-3-hydroxy-2-naphthahydrazide | catechols; hydrazide; hydrazone; naphthols | EC 3.6.5.5 (dynamin GTPase) inhibitor | |
| nms-e973 | NMS-E973: structure in first source |