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Unless otherwise stated all data on this page refer to the human proteins. Gene information is provided for human (Hs), mouse (Mm) and rat (Rn).
LAT3 (SLC43A1) and LAT4 (SLC43A2) are transporters with system L amino acid transporter activity, along with the structurally and functionally distinct transporters LAT1 and LAT2 that are members of the SLC7 family. LAT3 and LAT4 contain 12 putative TM domains with both N and C termini located intracellularly. They transport neutral amino acids in a manner independent of Na+ and Cl- and with two kinetic components [1-2]. LAT3/SLC43A1 is expressed in human tissues at high levels in the pancreas, liver, skeletal muscle and fetal liver [1] whereas LAT4/SLC43A2 is primarily expressed in the placenta, kidney and peripheral blood leukocytes [2]. SLC43A3 is expressed in vascular endothelial cells [3] but remains to be characterised.
LAT3 (L-type amino acid transporter 3 / SLC43A1) C Show summary »
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LAT4 (L-type amino acid transporter 4 / SLC43A2) C Show summary » |
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EEG1 (Solute carrier family 43 member 3 / SLC43A3) Show summary » |
Database page citation:
SLC43 family of large neutral amino acid transporters. Accessed on 05/11/2024. IUPHAR/BPS Guide to PHARMACOLOGY, http://www.guidetopharmacology.org/GRAC/FamilyDisplayForward?familyId=232.
Concise Guide to PHARMACOLOGY citation:
Alexander SPH, Fabbro D, Kelly E, Mathie AA, Peters JA, Veale EL, Armstrong JF, Faccenda E, Harding SD, Davies JA et al. (2023) The Concise Guide to PHARMACOLOGY 2023/24: Transporters. Br J Pharmacol. 180 Suppl 2:S374-469.
Covalent modification of LAT3 by N-ethylmaleimide inhibits its function [1] and at LAT4 inhibits the low-, but not high-affinity component of transport [2].