Pflügers Archiv

, Volume 447, Issue 5, pp 532–542

CATs and HATs: the SLC7 family of amino acid transporters


    • Institute of PhysiologyUniversity of Zürich
  • Ellen I. Closs
    • Department of PharmacologyJohannes Gutenberg University
  • Carsten A. Wagner
    • Institute of PhysiologyUniversity of Zürich
  • Manuel Palacin
    • Department of Biochemistry and Molecular BiologyUniversity of Barcelona
  • Hitoshi Endou
    • Department of Pharmacology and ToxicologyKyorin University School of Medicine
  • Yoshikatsu Kanai
    • Department of Pharmacology and ToxicologyKyorin University School of Medicine
The ABC of Solute carriers Guest Editor: Matthias A. Hediger

DOI: 10.1007/s00424-003-1086-z

Cite this article as:
Verrey, F., Closs, E.I., Wagner, C.A. et al. Pflugers Arch - Eur J Physiol (2004) 447: 532. doi:10.1007/s00424-003-1086-z


The SLC7 family is divided into two subgroups, the cationic amino acid transporters (the CAT family, SLC7A1–4) and the glycoprotein-associated amino acid transporters (the gpaAT family, SLC7A5–11), also called light chains or catalytic chains of the hetero(di)meric amino acid transporters (HAT). The associated glycoproteins (heavy chains) 4F2hc (CD98) or rBAT (D2, NBAT) form the SLC3 family. Members of the CAT family transport essentially cationic amino acids by facilitated diffusion with differential trans-stimulation by intracellular substrates. In some cells, they may regulate the rate of NO synthesis by controlling the uptake of l-arginine as the substrate for nitric oxide synthase (NOS). The heterodimeric amino acid transporters are, in contrast, quite diverse in terms of substrate selectivity and function (mostly) as obligatory exchangers. Their selectivity ranges from large neutral amino acids (system L) to small neutral amino acids (ala, ser, cys-preferring, system asc), negatively charged amino acid (system xc) and cationic amino acids plus neutral amino acids (system y+L and b0,+-like). Cotransport of Na+ is observed only for the y+L transporters when they carry neutral amino acids. Mutations in b0,+-like and y+L transporters lead to the hereditary diseases cystinuria and lysinuric protein intolerance (LPI), respectively.


Cationic amino acid transporterGlycoprotein-associated amino acid transporterHeterodimeric amino acid transporterCAT1LAT1b0,+ATxCTAsc-1CystinuriaLysinuric protein intolerance

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© Springer-Verlag  2004