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Extended motif recognition tunes WW domain affinity in MAGI-IQSEC complexes.

Jinchao Wang1, Yuting Li2, Yanze Wu2

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WW domains bind PPxY motifs, but specificity is key. This study reveals how extended sequences in IQSEC proteins enhance binding affinity to MAGI proteins, crucial for neurodevelopment and signaling.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Neuroscience

Background:

  • Proteins with WW domains often interact with proline-rich PPxY motifs.
  • Achieving specificity in these interactions within cellular contexts remains a challenge.
  • MAGI and IQSEC protein families are vital for neurodevelopment and synaptic signaling.

Purpose of the Study:

  • To characterize the WW domain-mediated interactions between MAGI and IQSEC protein families.
  • To elucidate the structural basis of specificity in these protein-protein interactions.
  • To establish a generalizable model for WW domain-mediated target selection.

Main Methods:

  • High-resolution crystal structure determination of the MAGI3-IQSEC3 complex.
  • Mutagenesis studies to identify key residues involved in binding.
  • Biochemical assays to assess binding affinity and complex formation.

Main Results:

  • A previously uncharacterized binding site on the MAGI3 WW1 domain interacts with an extended sequence of IQSEC3.
  • This extended interface significantly enhances binding affinity (dozens-fold).
  • Mutagenesis disrupting this interface abrogates complex formation, confirming its functional importance.

Conclusions:

  • The bipartite recognition mode involving motif extensions is evolutionarily conserved in MAGI and IQSEC families.
  • Motif extensions are critical for high-affinity and specific target selection by WW domains.
  • This mechanism provides a generalizable model for modular domain-mediated signaling networks with implications for neurodevelopment and synaptic function.