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Glycine (symbol Gly or G; [6] / ˈ ɡ l aɪ s iː n / ⓘ) [7] is an amino acid that has a single hydrogen atom as its side chain. It is the simplest stable amino acid. Glycine is one of the proteinogenic amino acids. It is encoded by all the codons starting with GG (GGU, GGC, GGA, GGG). [8]
The glycine receptor (abbreviated as GlyR or GLR) is the receptor of the amino acid neurotransmitter glycine. GlyR is an ionotropic receptor that produces its effects through chloride currents .
An amino acid neurotransmitter is an amino acid which is able to transmit a nerve message across a synapse. Neurotransmitters (chemicals) are packaged into vesicles that cluster beneath the axon terminal membrane on the presynaptic side of a synapse in a process called endocytosis .
Monoamines are synthesized by altering a single amino acid. For example, the precursor of serotonin is the amino acid tryptophan. Peptide neurotransmitters, or neuropeptides, are protein transmitters which are larger than the classical small-molecule neurotransmitters and are often released together to elicit a modulatory effect. [4]
Glycine transporters (GlyTs) are plasmalemmal neurotransmitter transporters. They serve to terminate the signaling of glycine by mediating its reuptake from the synaptic cleft back into the presynaptic neurons. There are two glycine transporters: glycine transporter 1 (GlyT1) and glycine transporter 2 (GlyT2). [1]
[4] [5] A binding site in the extracellular N-terminal ligand-binding domain gives them receptor specificity for (1) acetylcholine (AcCh), (2) serotonin, (3) glycine, (4) glutamate and (5) γ-aminobutyric acid (GABA) in vertebrates. The receptors are subdivided with respect to the type of ion that they conduct (anionic or cationic) and further ...
Sodium- and chloride-dependent glycine transporter 2, also known as glycine transporter 2 (GlyT2), is a protein that in humans is encoded by the SLC6A5 gene. [ 5 ] The glycine transporter 2 is a membrane protein which recaptures glycine , a major inhibitory transmitter in the spinal cord and brainstem .
Specific types of neurotransmitter transporters include the following: Glutamate/aspartate transporters, including: Excitatory amino acid transporter 1 (EAAT1) Excitatory amino acid transporter 2 (EAAT2) Excitatory amino acid transporter 3 (EAAT3) Excitatory amino acid transporter 4 (EAAT4) Excitatory amino acid transporter 5 (EAAT5)
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