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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Structural Biology

Background:

  • Planar cell polarity (PCP) governs cell and tissue organization during development.
  • The VANGL-PRICKLE (PK) protein complex is a key regulator of PCP, but its structural details and functions remain largely unknown.
  • Understanding the molecular mechanisms of PCP is vital for developmental biology and disease research.

Purpose of the Study:

  • To elucidate the structural basis of the interaction between VANGL proteins and PRICKLE proteins.
  • To investigate the functional role of PRICKLE1 in the localization of VANGL proteins within the cell.
  • To provide molecular insights into the regulation of planar cell polarity.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was used to determine high-resolution structures of human VANGL1, VANGL2, and their complexes with PRICKLE1.
  • Biochemical assays were employed to analyze the VANGL-PK interaction.
  • Cell imaging experiments were conducted to visualize protein localization and function.

Main Results:

  • Five cryo-EM structures of human VANGL1, VANGL2, and VANGL-PRICKLE1 complexes were resolved at 2.2-3.0 Å resolution.
  • The molecular details of the VANGL-PK interaction were deciphered.
  • PRICKLE1 was shown to target VANGL-containing intracellular vesicles to the peripheral cell membrane.

Conclusions:

  • The study provides the first high-resolution structural insights into the VANGL-PK interaction, a critical component of the PCP pathway.
  • PRICKLE1 plays a direct role in trafficking VANGL proteins to the cell periphery, influencing PCP establishment.
  • These findings offer a foundation for further research into the molecular mechanisms of PCP and related developmental processes.