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Structural basis of interaction between protein tyrosine phosphatase PCP-2 and beta-catenin

Yaqin He1, Hexin Yan, Hui Dong

  • 1International Co-operation Laboratory on Signal Transduction, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China.

Science in China. Series C, Life Sciences
|July 1, 2005
PubMed

Insights

Protein tyrosine phosphatase PCP-2 directly binds beta-catenin. The juxtamembrane region of PCP-2 is sufficient for this interaction, identified through deletion mutant analysis.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • PCP-2 is a receptor-like protein tyrosine phosphatase belonging to the MAM domain family.
  • Protein tyrosine phosphatases play crucial roles in cellular signaling pathways.

Purpose of the Study:

  • To identify the specific region of PCP-2 responsible for its interaction with beta-catenin.
  • To elucidate the molecular mechanism underlying the PCP-2 and beta-catenin association.

Main Methods:

  • Construction and expression of various deletion mutants of PCP-2.
  • Co-transfection of PCP-2 mutants and wild-type PCP-2 with beta-catenin in BHK-21 cells.
  • In vivo binding assay using immunoprecipitation with anti-catenin antibody.

Main Results:

  • Wild-type PCP-2, PCP-2 deltaC1C2, and PCP-2 deltaC2 associated with beta-catenin.
  • PCP-2 EXT, lacking the juxtamembrane region and PTP domains, did not bind beta-catenin.
  • This indicates a direct interaction between PCP-2 and beta-catenin.

Conclusions:

  • The juxtamembrane region of PCP-2 is essential and sufficient for its direct interaction with beta-catenin.
  • PCP-2 and beta-catenin associate directly, mediated by the juxtamembrane domain of PCP-2.

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