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Yes-associated protein 65 localizes p62(c-Yes) to the apical compartment of airway epithelia by association with EBP50.

We recently showed that the COOH terminus of the cystic fibrosis transmembrane conductance regulator associates with the submembranous scaffolding protein EBP50 (ERM-binding phosphoprotein 50 kD; also called Na(+)/H(+) exchanger regulatory factor). Since EBP50 associates with ezrin, this interaction links the cystic fibrosis transmembrane conductance regulator (CFTR) to the cortical actin cytoskeleton. EBP50 has two PDZ domains, and CFTR binds with high affinity to the first PDZ domain. Here, we report that Yes-associated protein 65 (YAP65) binds with high affinity to the second EBP50 PDZ domain. YAP65 is concentrated at the apical membrane in airway epithelia and interacts with EBP50 in cells. The COOH terminus of YAP65 is necessary and sufficient to mediate association with EBP50. The EBP50-YAP65 interaction is involved in the compartmentalization of YAP65 at the apical membrane since mutant YAP65 proteins lacking the EBP50 interaction motif are mislocalized when expressed in airway epithelial cells. In addition, we show that the nonreceptor tyrosine kinase c-Yes is contained within EBP50 protein complexes by association with YAP65. Subapical EBP50 protein complexes, containing the nonreceptor tyrosine kinase c-Yes, may regulate apical signal transduction pathways leading to changes in ion transport, cytoskeletal organization, or gene expression in epithelial cells.

Pubmed ID: 10562288 RIS Download

Mesh terms: Amino Acid Sequence | Animals | Binding Sites | Bronchi | Carrier Proteins | Cell Line | Cell Membrane | Colon | Cystic Fibrosis Transmembrane Conductance Regulator | Epithelial Cells | Humans | Molecular Sequence Data | Mutagenesis, Site-Directed | Peptide Fragments | Phosphoproteins | Protein-Tyrosine Kinases | Proto-Oncogene Proteins | Proto-Oncogene Proteins c-yes | Recombinant Proteins | Sodium-Hydrogen Antiporter | Transfection | src-Family Kinases

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Associated grants

  • Agency: NIDDK NIH HHS, Id: P01 DK050795
  • Agency: NHLBI NIH HHS, Id: P50 HL060280
  • Agency: NIDDK NIH HHS, Id: DK50795
  • Agency: NCI NIH HHS, Id: CA45757
  • Agency: NIDDK NIH HHS, Id: R29DK50744

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