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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Structural Biology

Background:

  • Neurite self-recognition and avoidance are essential for nervous system development, guiding dendritic arborization and preventing self-connections.
  • Clustered protocadherins (PCDH) with their diverse isoforms provide individual neurons with unique identities, mediating self-recognition.
  • Previous studies characterized protocadherin cis and trans interactions in isolation, but the full-length ectodomain structure and its role in neuronal surface self-recognition remained unknown.

Purpose of the Study:

  • To determine the molecular arrangement of full-length clustered protocadherin ectodomains in self-recognition complexes.
  • To elucidate the structural basis of how protocadherins mediate neuronal self-recognition and avoidance.

Main Methods:

  • X-ray crystallography was used to determine the structure of the clustered protocadherin γB4 ectodomain.
  • Cryo-electron tomography was employed to visualize the assembly of clustered protocadherin γB6 ectodomains on liposomes.

Main Results:

  • The crystal structure of clustered protocadherin γB4 revealed a zipper-like lattice formed by alternating cis and trans interactions.
  • Cryo-electron tomography demonstrated that clustered protocadherin γB6 ectodomains spontaneously assemble into linear arrays at membrane contact sites.
  • These linear assemblies form parallel arrays, creating larger two-dimensional structures between membranes, consistent with the crystal structure.

Conclusions:

  • The formation of ordered linear assemblies by clustered protocadherins is a key initial step in neuronal self-recognition and avoidance.
  • These findings support the isoform-mismatch chain-termination model of protocadherin-mediated self-recognition.
  • The study provides structural insights into how protocadherins establish neuronal boundaries and ensure proper nervous system wiring.