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Amino-acid transport by heterodimers of 4F2hc/CD98 and members of a permease family

Author

Listed:
  • Luca Mastroberardino

    (Institutes of Physiology and Anatomy, University of Zürich)

  • Benjamin Spindler

    (Institutes of Physiology and Anatomy, University of Zürich)

  • Rahel Pfeiffer

    (Institutes of Physiology and Anatomy, University of Zürich)

  • Patrick J. Skelly

    (Harvard School of Public Health)

  • Jan Loffing

    (Institutes of Anatomy, University of Zürich)

  • Charles B. Shoemaker

    (Harvard School of Public Health)

  • François Verrey

    (Institutes of Physiology and Anatomy, University of Zürich)

Abstract

Amino-acid transport across cellular plasma membranes depends on several parallel-functioning (co-)transporters and exchangers1. The widespread transport system L accounts for a sodium-independent exchange of large, neutral amino acids, whereas the system y+L exchanges positively charged amino acids and/or neutral amino acids together with sodium2,3. The molecular nature of these transporters remains unknown, although expression of the human cell-surface glycoprotein 4F2 heavy chain (h4F2hc; CD98 in the mouse)4,5 is known to induce low levels of L- and/or y+L-type transport6,7,8,9. This glycoprotein is found in activated lymphocytes, together with an uncharacterized, disulphide-linked lipophilic light chain with an apparent relative molecular mass of 40,000 (Mr 40K)10,11. Here we identify the permease-related protein E16 (ref. 12) as the first light chain of h4F2hc and show that the resulting heterodimeric complex mediates L-type amino-acid transport. The homologous protein from Schistosoma mansoni, SPRM1, also associates covalently with coexpressed h4F2hc glycoprotein, although it induces amino-acid transport of different substrate specificity. The coexpression of h4F2hc is required for surface expression of these permease-related light chains, which belong to a new family of amino-acid transporters that form heterodimers with cell-surface glycoproteins.

Suggested Citation

  • Luca Mastroberardino & Benjamin Spindler & Rahel Pfeiffer & Patrick J. Skelly & Jan Loffing & Charles B. Shoemaker & François Verrey, 1998. "Amino-acid transport by heterodimers of 4F2hc/CD98 and members of a permease family," Nature, Nature, vol. 395(6699), pages 288-291, September.
  • Handle: RePEc:nat:nature:v:395:y:1998:i:6699:d:10.1038_26246
    DOI: 10.1038/26246
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    1. Yaning Li & Yingying Guo & Angelika Bröer & Lu Dai & Stefan Brӧer & Renhong Yan, 2024. "Cryo-EM structure of the human Asc-1 transporter complex," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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