gated ion channel
Transmembrane proteins of excitable cells, that allow a flux of ions to pass only under defined circumstances. Channels may be either voltage-gated, such as the sodium channel of neurons, or ligand-gated such as the acetylcholine receptor of cholinergic synapses. Channels tend to be relatively ion-specific and allow fluxes of typically 1000 ions to pass in around 1ms; they are thus much faster at moving ions across a membrane than transport ATPases.

Dictionary of molecular biology. 2004.

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  • Cyclic nucleotide-gated ion channel — Cyclic nucleotide gated (CNG) ion channels are ion channels that function in response to the binding of cyclic nucleotides. CNG channels are nonselective cation channels that are found in the membranes of various types of cells. Signal… …   Wikipedia

  • Ligand-gated ion channel — Neurotransmitter gated ion channel transmembrane region Ligand gated ion channel Identifiers Symbol Neur chan memb Pfam …   Wikipedia

  • Light-gated ion channel — Light gated ion channels are a group of transmembrane proteins that form ion channels; pores which open or close in response to light. Most light gated ion channels have been synthesized in the laboratory for study, though one naturally occurring …   Wikipedia

  • Voltage-gated ion channel — Voltage gated ion channels are a class of transmembrane ion channels that are activated by changes in electrical potential difference near the channel; these types of ion channels are especially critical in neurons, but are common in many types… …   Wikipedia

  • ligand-gated ion channel — A transmembrane ion channel whose permeability is increased by the binding of a specific ligand, typically a neurotransmitter at a chemical synapse. The permeability change is often drastic; such channels let through effectively no ions when shut …   Dictionary of molecular biology

  • G-protein-gated ion channel — G protein coupled channels (GPC) are stimulated when the neurotransmitter binds to the G protein coupled receptor (GCR). This activates G proteins, which move to another ion channel. The G Proteins allow the channel to open and ions are able to… …   Wikipedia

  • voltage-gated ion channel — A transmembrane ion channel whose permeability to ions is extremely sensitive to the transmembrane potential difference. These channels are essential for neuronal signal transmission, and for intracellular signal transduction. See sodium channel …   Dictionary of molecular biology

  • Ion channel — Not to be confused with: Ion Television or Ion implantation. Schematic diagram of an ion channel. 1 channel domains (typically four per channel), 2 outer vestibule, 3 selectivity filter, 4 diameter of selectivity filter, 5 phosphorylation site, 6 …   Wikipedia

  • Ion channel linked receptors — are cell membrane bound receptors. They act through synaptic signaling on electrically excitable cells. The ion channels opening and closing is controlled by neurotransmitters.Ion channel linked receptors are also called ligand gated channels .… …   Wikipedia

  • ion channel — A transmembrane pore that presents a hydrophilic channel for ions to cross a lipid bilayer down their electrochemical gradients. Some degree of ion specificity is usually observed, and typically a million ions per second may flow. Channels may be …   Dictionary of molecular biology

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