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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.
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]
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 .
Glycine is degraded via three pathways. The predominant pathway in animals and plants is the reverse of the glycine synthase pathway mentioned above. In this context, the enzyme system involved is usually called the glycine cleavage system: [36] Glycine + tetrahydrofolate + NAD + ⇌ CO 2 + NH + 4 + N 5,N 10-methylene tetrahydrofolate + NADH + H +
The neurotransmitter's effect on the target cell is determined by the receptor it binds to. Many neurotransmitters are synthesized from simple and plentiful precursors such as amino acids, which are readily available and often require a small number of biosynthetic steps for conversion. Neurotransmitters are essential to the function of complex ...
Neurotransmitter transporters frequently use electrochemical gradients that exist across cell membranes to carry out their work. For example, some transporters use energy obtained by the cotransport, or symport, of Na + in order to move glutamate across membranes. Such neurotransporter cotransport systems are highly diverse, as recent ...
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]
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.