Neurofibromin occluded conformation

Experimental Data Snapshot

  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

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Structural basis of activation of the tumor suppressor protein neurofibromin.

Chaker-Margot, M.Werten, S.Dunzendorfer-Matt, T.Lechner, S.Ruepp, A.Scheffzek, K.Maier, T.

(2022) Mol Cell 82: 1288

  • DOI: https://doi.org/10.1016/j.molcel.2022.03.011
  • Primary Citation of Related Structures:  
    7R03, 7R04

  • PubMed Abstract: 

    Mutations in the NF1 gene cause the familial genetic disease neurofibromatosis type I, as well as predisposition to cancer. The NF1 gene product, neurofibromin, is a GTPase-activating protein and acts as a tumor suppressor by negatively regulating the small GTPase, Ras. However, structural insights into neurofibromin activation remain incompletely defined. Here, we provide cryoelectron microscopy (cryo-EM) structures that reveal an extended neurofibromin homodimer in two functional states: an auto-inhibited state with occluded Ras-binding site and an asymmetric open state with an exposed Ras-binding site. Mechanistically, the transition to the active conformation is stimulated by nucleotide binding, which releases a lock that tethers the catalytic domain to an extended helical repeat scaffold in the occluded state. Structure-guided mutational analysis supports functional relevance of allosteric control. Disease-causing mutations are mapped and primarily impact neurofibromin stability. Our findings suggest a role for nucleotides in neurofibromin regulation and may lead to therapeutic modulation of Ras signaling.

  • Organizational Affiliation

    Biozentrum, University of Basel, 4056 Basel, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Isoform I of Neurofibromin
A, B
2,818Homo sapiensMutation(s): 0 
Gene Names: NF1
UniProt & NIH Common Fund Data Resources
Find proteins for P21359 (Homo sapiens)
Explore P21359 
Go to UniProtKB:  P21359
PHAROS:  P21359
GTEx:  ENSG00000196712 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21359
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Human Frontier Science Program (HFSP)Switzerland--

Revision History  (Full details and data files)

  • Version 1.0: 2022-03-30
    Type: Initial release
  • Version 1.1: 2022-04-13
    Changes: Database references
  • Version 1.2: 2022-04-20
    Changes: Database references