National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35 GM132120
United States
National Research Foundation (NRF, Singapore)
MOH-000155
Singapore
Citation
Journal: Cell / Year: 2021 Title: Structural Basis of WLS/Evi-Mediated Wnt Transport and Secretion. Authors: Rie Nygaard / Jia Yu / Jonathan Kim / Daniel R Ross / Giacomo Parisi / Oliver B Clarke / David M Virshup / Filippo Mancia / Abstract: Wnts are evolutionarily conserved ligands that signal at short range to regulate morphogenesis, cell fate, and stem cell renewal. The first and essential steps in Wnt secretion are their O- ...Wnts are evolutionarily conserved ligands that signal at short range to regulate morphogenesis, cell fate, and stem cell renewal. The first and essential steps in Wnt secretion are their O-palmitoleation and subsequent loading onto the dedicated transporter Wntless/evenness interrupted (WLS/Evi). We report the 3.2 Å resolution cryogenic electron microscopy (cryo-EM) structure of palmitoleated human WNT8A in complex with WLS. This is accompanied by biochemical experiments to probe the physiological implications of the observed association. The WLS membrane domain has close structural homology to G protein-coupled receptors (GPCRs). A Wnt hairpin inserts into a conserved hydrophobic cavity in the GPCR-like domain, and the palmitoleate protrudes between two helices into the bilayer. A conformational switch of highly conserved residues on a separate Wnt hairpin might contribute to its transfer to receiving cells. This work provides molecular-level insights into a central mechanism in animal body plan development and stem cell biology.
History
Deposition
Oct 5, 2020
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Header (metadata) release
Jan 6, 2021
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Map release
Jan 6, 2021
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Update
Oct 9, 2024
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Current status
Oct 9, 2024
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
EMPIAR-10699 (Title: Human WLS in complex with WNT8A / Data size: 1.9 TB Data #1: Unaligned multi frame micrographs of WNT8A WLS complex [micrographs - multiframe])
Supramolecule #1: Complex of WLS/Evi and WNT8A in nanodisc
Supramolecule
Name: Complex of WLS/Evi and WNT8A in nanodisc / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 / Details: Nanodisc were formed using MSP1E3D1 and POPG lipid
Source (natural)
Organism: Homo sapiens (human)
Molecular weight
Theoretical: 105.6 KDa
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Macromolecule #1: Protein Wnt-8a
Macromolecule
Name: Protein Wnt-8a / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV
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Electron microscopy
Microscope
FEI TITAN
Image recording
Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Digitization - Dimensions - Width: 5760 pixel / Digitization - Dimensions - Height: 4092 pixel / Number grids imaged: 1 / Number real images: 12747 / Average exposure time: 3.0 sec. / Average electron dose: 58.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron optics
Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
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Image processing
Particle selection
Number selected: 4415933
Startup model
Type of model: OTHER
Final reconstruction
Number classes used: 1 / Resolution.type: BY AUTHOR / Resolution: 3.19 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 2.15) / Software - details: Local refinement / Number images used: 27288
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