6D32

Crystal structure of Xenopus Smoothened in complex with cyclopamine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.75 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 

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This is version 1.3 of the entry. See complete history


Literature

Structural Basis of Smoothened Activation in Hedgehog Signaling.

Huang, P.Zheng, S.Wierbowski, B.M.Kim, Y.Nedelcu, D.Aravena, L.Liu, J.Kruse, A.C.Salic, A.

(2018) Cell 174: 312-324.e16

  • DOI: 10.1016/j.cell.2018.04.029
  • Primary Citation of Related Structures:  
    6D35, 6D32

  • PubMed Abstract: 
  • The seven-transmembrane-spanning protein Smoothened is the central transducer in Hedgehog signaling, a pathway fundamental in development and in cancer. Smoothened is activated by cholesterol binding to its extracellular cysteine-rich domain (CRD). How this interaction leads to changes in the transmembrane domain and Smoothened activation is unknown ...

    The seven-transmembrane-spanning protein Smoothened is the central transducer in Hedgehog signaling, a pathway fundamental in development and in cancer. Smoothened is activated by cholesterol binding to its extracellular cysteine-rich domain (CRD). How this interaction leads to changes in the transmembrane domain and Smoothened activation is unknown. Here, we report crystal structures of sterol-activated Smoothened. The CRD undergoes a dramatic reorientation, allosterically causing the transmembrane domain to adopt a conformation similar to active G-protein-coupled receptors. We show that Smoothened contains a unique inhibitory π-cation lock, which is broken on activation and is disrupted in constitutively active oncogenic mutants. Smoothened activation opens a hydrophobic tunnel, suggesting a pathway for cholesterol movement from the inner membrane leaflet to the CRD. All Smoothened antagonists bind the transmembrane domain and block tunnel opening, but cyclopamine also binds the CRD, inducing the active transmembrane conformation. Together, these results define the mechanisms of Smoothened activation and inhibition.


    Organizational Affiliation

    Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA. Electronic address: asalic@hms.harvard.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Smoothened,Soluble cytochrome b562,SmoothenedA612Xenopus laevisEscherichia coliMutation(s): 4 
Gene Names: smocybC
Membrane Entity: Yes 
UniProt
Find proteins for A0A1L8GTP2 (Xenopus laevis)
Explore A0A1L8GTP2 
Go to UniProtKB:  A0A1L8GTP2
Find proteins for P0ABE7 (Escherichia coli)
Explore P0ABE7 
Go to UniProtKB:  P0ABE7
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CY8 (Subject of Investigation/LOI)
Query on CY8

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]Cyclopamine
C27 H41 N O2
QASFUMOKHFSJGL-LAFRSMQTSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.75 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 145.778α = 90
b = 79.232β = 108.51
c = 104.076γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
DIALSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United StatesGM110041

Revision History  (Full details and data files)

  • Version 1.0: 2018-05-23
    Type: Initial release
  • Version 1.1: 2018-06-13
    Changes: Data collection, Database references
  • Version 1.2: 2018-07-25
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-18
    Changes: Author supporting evidence