8WMA image
Deposition Date 2023-10-03
Release Date 2024-09-11
Last Version Date 2024-10-30
Entry Detail
PDB ID:
8WMA
Title:
Fzd4/DEP complex (local refined)
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.47 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Frizzled-4
Gene (Uniprot):FZD4
Chain IDs:A
Chain Length:537
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Segment polarity protein dishevelled homolog DVL-2
Gene (Uniprot):DVL2
Chain IDs:B (auth: C)
Chain Length:736
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structural basis of Frizzled 4 in recognition of Dishevelled 2 unveils mechanism of WNT signaling activation.
Nat Commun 15 7644 7644 (2024)
PMID: 39223191 DOI: 10.1038/s41467-024-52174-z

Abstact

WNT signaling is fundamental in development and homeostasis, but how the Frizzled receptors (FZDs) propagate signaling remains enigmatic. Here, we present the cryo-EM structure of FZD4 engaged with the DEP domain of Dishevelled 2 (DVL2), a key WNT transducer. We uncover a distinct binding mode where the DEP finger-loop inserts into the FZD4 cavity to form a hydrophobic interface. FZD4 intracellular loop 2 (ICL2) additionally anchors the complex through polar contacts. Mutagenesis validates the structural observations. The DEP interface is highly conserved in FZDs, indicating a universal mechanism by which FZDs engage with DVLs. We further reveal that DEP mimics G-protein/β-arrestin/GRK to recognize an active conformation of receptor, expanding current GPCR engagement models. Finally, we identify a distinct FZD4 dimerization interface. Our findings delineate the molecular determinants governing FZD/DVL assembly and propagation of WNT signaling, providing long-sought answers underlying WNT signal transduction.

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Primary Citation of related structures