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MUC1 membrane trafficking is modulated by multiple interactions.

Carol L Kinlough1, Paul A Poland, James B Bruns

  • 1Laboratory of Epithelial Cell Biology, Department of Medicine, Renal-Electrolyte Division, University of Pittsburgh, Pittsburgh, PA 15261, USA.

The Journal of Biological Chemistry
|October 9, 2004
PubMed
Summary
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Aberrant MUC1 intracellular localization signals aggressive tumors. This study reveals tyrosine residues Tyr(20) and Tyr(60) are crucial for MUC1 internalization, with Tyr(20) mediating AP-2 binding and Tyr(60) facilitating Grb2 interaction.

Area of Science:

  • Cell biology
  • Molecular biology
  • Cancer research

Background:

  • MUC1 is a transmembrane protein on epithelial surfaces.
  • Aberrant intracellular MUC1 localization correlates with poor prognosis in cancer patients.
  • Previous studies showed truncated O-glycans on MUC1 inhibit surface expression and promote endocytosis.

Purpose of the Study:

  • To characterize features modulating MUC1 membrane trafficking, independent of glycosylation state.
  • To identify specific signals within MUC1 responsible for its internalization.
  • To elucidate the molecular mechanisms governing MUC1 endocytosis.

Main Methods:

  • Utilized [(35)S]Met/Cys-labeled MUC1 in glycosylation-defective Chinese hamster ovary cells.
  • Constructed MUC1-Tac chimeras to study ectodomain influence on endocytosis.

Related Experiment Videos

  • Analyzed truncation and tyrosine mutants of MUC1 chimeras.
  • Performed co-immunoprecipitation assays with AP-2 and Grb2.

    • Main Results:

    • The MUC1 ectodomain significantly inhibits MUC1 internalization.
    • Endocytosis of MUC1-Tac chimeras was faster than wild-type MUC1.
    • Tyrosine residues Tyr(20) and Tyr(60) are essential for efficient MUC1 endocytosis.
    • Tyr(20) mediates binding to AP-2 via a YXXphi motif, while Tyr(60) facilitates Grb2 binding.

    Conclusions:

    • MUC1 internalization is regulated by specific tyrosine residues in its cytoplasmic tail.
    • Tyr(20) acts as an internalization signal recognized by AP-2.
    • Tyr(60) phosphorylation and subsequent Grb2 binding play a significant role in MUC1 endocytosis.
    • These findings provide new insights into MUC1 trafficking and its potential role in cancer progression.