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Molecular basis of distinct interactions between Dok1 PTB domain and tyrosine-phosphorylated EGF receptor

Yong Zhang1, Zhiyong Yan, Amjad Farooq

  • 1Department of Neurobiology, Second Military Medical University, Shanghai 200433, People's Republic of China.

Journal of Molecular Biology
|October 13, 2004
PubMed

Insights

The Dok1 phosphotyrosine binding (PTB) domain selectively binds to specific sites on the epidermal growth factor receptor (EGFR). This study reveals the molecular basis for this specific interaction, crucial for cell signaling.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Structural Biology

Background:

  • Adaptor proteins, such as Downstream of Tyrosine Kinases (Doks), contain Phosphotyrosine Binding (PTB) domains crucial for signal transduction.
  • PTB domains regulate cell growth, proliferation, and differentiation by interacting with cell-surface receptors.
  • The specific ligand interactions of Dok PTB domains have not been previously defined.

Purpose of the Study:

  • To investigate the molecular basis for the specific binding of the Dok1 PTB domain to the epidermal growth factor receptor (EGFR).
  • To identify the structural determinants responsible for the selective interaction between Dok1 PTB and EGFR.

Main Methods:

  • Yeast two-hybrid assays to assess protein-protein interactions.
  • Biochemical binding assays to confirm and quantify binding affinities.
  • Structure-based mutational analyses to define key interaction sites.

Main Results:

  • The Dok1 PTB domain selectively binds to tyrosine phosphorylation sites Y1086 and Y1148 on EGFR.
  • Dok4 and Dok5 PTB domains do not exhibit this selective binding to EGFR.
  • Mutational analyses identified specific molecular determinants governing the Dok1 PTB domain/EGFR interaction.

Conclusions:

  • The study elucidates the molecular basis for the specific interaction between the Dok1 PTB domain and EGFR.
  • Structural insights are provided into the selective binding of PTB domains to EGFR, highlighting differences among Dok homologues.
  • This understanding is vital for deciphering signaling pathways regulated by EGFR and Dok proteins.

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