7MP5 image
Deposition Date 2021-05-04
Release Date 2021-12-15
Last Version Date 2024-05-29
Entry Detail
PDB ID:
7MP5
Title:
Autoinhibited neurofibrobmin
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
5.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Isoform I of Neurofibromin
Gene (Uniprot):NF1
Chain IDs:A, B
Chain Length:2826
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
The cryo-EM structure of the human neurofibromin dimer reveals the molecular basis for neurofibromatosis type 1.
Nat.Struct.Mol.Biol. 28 982 988 (2021)
PMID: 34887559 DOI: 10.1038/s41594-021-00687-2

Abstact

Neurofibromin (NF1) mutations cause neurofibromatosis type 1 and drive numerous cancers, including breast and brain tumors. NF1 inhibits cellular proliferation through its guanosine triphosphatase-activating protein (GAP) activity against rat sarcoma (RAS). In the present study, cryo-electron microscope studies reveal that the human ~640-kDa NF1 homodimer features a gigantic 30 × 10 nm array of α-helices that form a core lemniscate-shaped scaffold. Three-dimensional variability analysis captured the catalytic GAP-related domain and lipid-binding SEC-PH domains positioned against the core scaffold in a closed, autoinhibited conformation. We postulate that interaction with the plasma membrane may release the closed conformation to promote RAS inactivation. Our structural data further allow us to map the location of disease-associated NF1 variants and provide a long-sought-after structural explanation for the extreme susceptibility of the molecule to loss-of-function mutations. Collectively these findings present potential new routes for therapeutic modulation of the RAS pathway.

Legend

Protein

Chemical

Disease

Primary Citation of related structures