b(0,+)-type amino acid transporter 1

UniProtKB accession:  P82251

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UniProtKB description:  Associates with SLC3A1 to form a functional transporter complex that mediates the electrogenic exchange between cationic amino acids and neutral amino acids, with a stoichiometry of 1:1 (PubMed:8663357, PubMed:16825196, PubMed:32817565, PubMed:32494597). Has system b(0,+)-like activity with high affinity for extracellular cationic amino acids and L-cystine and lower affinity for intracellular neutral amino acids (PubMed:8663357, PubMed:16825196, PubMed:32494597). Substrate exchange is driven by high concentration of intracellular neutral amino acids and the intracellular reduction of L-cystine to L-cysteine (PubMed:8663357). Required for reabsorption of L-cystine and dibasic amino acids across the brush border membrane in renal proximal tubules.