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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 .
In mature adults, glycine is a inhibitory neurotransmitter found in the spinal cord and regions of the brain. [15] As it binds to a glycine receptor, a conformational change is induced, and the channel created by the receptor opens. [17] As the channel opens, chloride ions are able to flow into the cell which results in hyperpolarization.
The principal function of glycine is it acts as a precursor to proteins. Most proteins incorporate only small quantities of glycine, a notable exception being collagen , which contains about 35% glycine due to its periodically repeated role in the formation of collagen's helix structure in conjunction with hydroxyproline .
Neurotransmitters are essential to the function of complex neural systems. The exact number of unique neurotransmitters in humans is unknown, but more than 100 have been identified. [3] Common neurotransmitters include glutamate, GABA, acetylcholine, glycine, dopamine and norepinephrine.
The basic structure and functions associated with the NMDA receptor can be attributed to the GluN2B subunit. For example, the glutamate binding site and the control of the Mg 2+ block are formed by the GluN2B subunit. The high affinity sites for glycine antagonist are also exclusively displayed by the GluN1/GluN2B receptor. [31]
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]
Drugs targeting the neurotransmitter of such systems affect the whole system, which explains the mode of action of many drugs. [citation needed] Most other neurotransmitters, on the other hand, e.g. glutamate, GABA and glycine, are used very generally throughout the central nervous system.
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 .