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Beta1 integrins show specific association with CD98 protein in low density membranes

T V Kolesnikova1, B A Mannion, F Berditchevski

  • 1Dana-Farber Cancer Institute, Harvard Medical School, 44 Binney Street, Boston, MA 02115, USA. tatiana_kolesnikova@dfci.harvard.edu

BMC Biochemistry
|November 7, 2001
PubMed

Insights

CD98 (4F2) protein specifically associates with beta1 integrins in low-density cell membranes. This interaction, crucial for cell functions, may depend on the CD98 light chain, as indicated by mutation studies.

Area of Science:

  • Cell Biology
  • Molecular Interactions
  • Protein Biochemistry

Background:

  • CD98 (4F2, FRP-1) is a cell surface protein heterodimer involved in amino acid transport, cell fusion, and aggregation.
  • Evidence suggests functional interaction between CD98 and integrins, but the biochemical basis remains unclear.

Purpose of the Study:

  • To elucidate the biochemical basis of CD98's interaction with integrins.
  • To identify specific integrin subtypes and CD98 components involved in this association.

Main Methods:

  • Reciprocal immunoprecipitation experiments to confirm CD98-integrin association.
  • Analysis of CD98 mutants (C109S, C330S) to assess the role of specific residues.
  • Sucrose gradient fractionation to localize protein interactions within cell membranes.

Main Results:

  • CD98 specifically associates with beta1 integrins (alpha2beta1, alpha3beta1, alpha5beta1, alpha6beta1), but minimally with alpha4beta1.
  • The C109S mutation in the CD98 heavy chain abolished beta1 integrin and light chain association.
  • CD98 preferentially associates with beta1 integrins in low-density membrane fractions.

Conclusions:

  • CD98 specifically associates with beta1 integrins within low-density membrane microdomains.
  • The CD98 light chain and potentially a specific cysteine residue (C109) in the heavy chain are critical for this interaction.
Abstract

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