Decoding WW domain tandem-mediated target recognitions in tissue growth and cell polarity

Area of Science:

• Molecular Biology
• Cell Biology
• Structural Biology

Background:

• WW domain tandem proteins like KIBRA, YAP, and MAGI are crucial for cell growth and polarity.
• A significant gap exists between the broad binding of WW domains and their specific cellular roles.

Purpose of the Study:

• To investigate the target binding specificity and rules of WW domain tandems in cell growth regulatory proteins.
• To identify novel binding partners of WW domain tandems.

Main Methods:

• Systematic structural biology approaches.
• Biochemical analyses of protein-protein interactions.

Main Results:

• WW domain tandems of KIBRA and MAGI, but not YAP, demonstrate high-affinity and sequence-specific binding to target proteins.
• Decoding of WW domain tandem target recognition mechanisms.
• Identification of new binding proteins, including β-Dystroglycan, JCAD, and PTPN21.

Conclusions:

• WW domain tandem binding specificity is key to their function in regulating cell growth and polarity.
• Elucidated mechanisms provide a foundation for studying WW domain proteins in various cellular processes, including neuronal signaling.