Redefining PTB domain into independently functional dual cores

Area of Science:

• Biochemistry
• Structural Biology
• Molecular Medicine

Background:

• The structure and function of phosphotyrosine binding (PTB) domains are not fully understood.
• A novel atypical PTB (aPTB) domain was recently identified in CCM2, indicating dual PTB domain presence.
• The small size of aPTB domains suggests potential for PTB domain size reduction.

Purpose of the Study:

• To investigate the structural and functional basis of PTB domains.
• To explore the possibility of reducing the size of typical PTB domains.
• To develop novel inhibitors targeting the NPXY binding motif for therapeutic applications.

Main Methods:

• Structural analysis of PTB domains.
• Functional assays to assess NPXY motif binding.
• Development and testing of small molecule inhibitors (cis- and trans-).

Main Results:

• Demonstrated that typical PTB domains can be divided into two core structural and functional units.
• Identified minimum core motifs (mCores) as the functional units of PTB domains, structurally resembling aPTB domains.
• Developed potential cis- and trans-inhibitors targeting the NPXY binding interaction.

Conclusions:

• PTB domains can be functionally dissected into smaller, conserved mCore units.
• The identified mCore structure is similar to the novel aPTB domain.
• Developed inhibitors targeting NPXY binding offer potential therapeutic strategies for various health conditions.