7R03

Neurofibromin occluded conformation


Experimental Data Snapshot

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

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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: 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 ...

    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. Electronic address: timm.maier@unibas.ch.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Isoform I of NeurofibrominA, B2,818Homo 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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21359
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

View Full Validation Report



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