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Structural insights into Frizzled3 through nanobody modulators.

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Area of Science:

  • Structural Biology
  • Neuroscience
  • Cancer Biology

Background:

  • Frizzled3 (FZD3) is a Wnt receptor crucial for brain development and cancer.
  • Understanding FZD3's structure is key to modulating its signaling pathways.

Purpose of the Study:

  • To determine the structures of FZD3 in complex with nanobodies.
  • To investigate how nanobodies interact with FZD3 extracellularly and intracellularly.
  • To explore the functional and therapeutic potential of FZD3-nanobody interactions.

Main Methods:

  • X-ray crystallography to resolve FZD3-nanobody complexes.
  • Cryo-electron microscopy (cryo-EM) for structural determination.
  • Biochemical assays to assess signaling pathway activation and inhibition.

Main Results:

  • Nanobody Nb8 binds the FZD3 cysteine-rich domain (CRD) at the lipid-binding groove, competing with Wnt5a.
  • Nb8 fusion protein acts as a Wnt surrogate, activating beta-catenin signaling.
  • Nanobody Nb9 binds the intracellular region of FZD3, inhibiting Dishevelled (DVL) binding and GαS coupling.
  • FZD3 adopts a transmembrane conformation similar to active GPCRs.

Conclusions:

  • Structural insights into FZD3-nanobody interactions reveal mechanisms for pathway modulation.
  • Nanobody modulators offer potential for therapeutic intervention in FZD3-related diseases.
  • Mapping extracellular and intracellular interfaces provides a basis for targeted drug design.