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The structure of Sl6 family transporters share 20-25% sequence similarity with LeuTA [6] providing an evolutionary relationship between the transporter and the leucine transporter protein. [2] Because of the similarity, the LeuTa protein provides a very close template model for the studying the transporters in greater detail. [ 1 ]
Tiagabine, a drug used as an anticonvulsant, acts by inhibiting the GABA transporter 1. Neurotransmitter transporters inhibitors Vesicular transporters could provide an alternative therapeutic target for the modulation of chemical neurotransmission, as the activity of these transporters could affect the quantity of neurotransmitter released.
For example, the aquaporin 3 channel has a pore width of 8–10 Ångströms and allows the passage of hydrophilic molecules ranging between 150 and 200 Da. However, the water pores completely block ions including protons , essential to conserve the membrane's electrochemical potential difference.
Figure 1. The seven transmembrane α-helix structure of a G-protein-coupled receptor. A neurotransmitter receptor (also known as a neuroreceptor) is a membrane receptor protein [1] that is activated by a neurotransmitter. [2] Chemicals on the outside of the cell, such as a neurotransmitter, can bump into the cell's membrane, in which there are ...
The rate of ion transport through the channel is very high (often 10 6 ions per second or greater). Ions pass through channels down their electrochemical gradient , which is a function of ion concentration and membrane potential, "downhill", without the input (or help) of metabolic energy (e.g. ATP , co-transport mechanisms, or active transport ...
The family of glutamate transporters is composed of two primary subclasses: the excitatory amino acid transporter (EAAT) family and vesicular glutamate transporter (VGLUT) family. In the brain, EAATs remove glutamate from the synaptic cleft and extrasynaptic sites via glutamate reuptake into glial cells and neurons , while VGLUTs move glutamate ...
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The sodium channel selectivity filter is composed of a single residue in each of the four pore-loops of the four functional domains. These four residues are known as the DEKA motif. [52] The permeation rate of sodium through the sodium channel is determined by a four carboxylate residues, the EEDD motif, which make up the outer charged ring. [52]