2E2X

Sec14 Homology Module of Neurofibromin in complex with phosphatitylethanolamine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.254 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The sec14 homology module of neurofibromin binds cellular glycerophospholipids: mass spectrometry and structure of a lipid complex

Welti, S.Fraterman, S.D'Angelo, I.Wilm, M.Scheffzek, K.

(2007) J.Mol.Biol. 366: 551-562

  • DOI: 10.1016/j.jmb.2006.11.055

  • PubMed Abstract: 
  • Neurofibromin is the protein product of the tumor suppressor gene NF1, alterations of which are responsible for the pathogenesis of the common disorder Neurofibromatosis type I (NF1). The only well-characterized function of neurofibromin is its RasGA ...

    Neurofibromin is the protein product of the tumor suppressor gene NF1, alterations of which are responsible for the pathogenesis of the common disorder Neurofibromatosis type I (NF1). The only well-characterized function of neurofibromin is its RasGAP activity, contained in the central GAP related domain (GRD). By solving the crystal structure of a 31 kDa fragment at the C-terminal end of the GRD we have recently identified a novel bipartite lipid-binding module composed of a Sec14 homologous and a previously undetected pleckstrin homology (PH)-like domain. Using lipid exchange assays along with mass spectrometry we show here that the Sec14-like portion binds to 1-(3-sn-phosphatidyl)-sn-glycerol (PtdGro), (3-sn-phosphatidyl)-ethanolamine (PtdEtn) and -choline (PtdCho) and to a minor extent to (3-sn-phosphatidyl)-l-serine (PtdSer) and 1-(3-sn-phosphatidyl)-d-myo-inositol (PtdIns). Phosphorylated PtdIns (PtdInsPs) are not detected as binders in the mass spectrometry assay, but their soluble inositol-phosphate headgroups and related compounds can inhibit the lipid exchange reaction. We also present here the crystal structure of this module with the Sec14 portion bound to a cellular glycerophospholipid ligand. Our structure has model character for the substrate-bound form of yeast Sec14p, of which only detergent bound structures are available so far. To assess potential regulation of the lipid exchange reaction in detail, we present a novel strategy using nanospray mass spectrometry. Ion intensities of initial phospholipids and exchanged deuterated analogues bound by the protein module allow the quantitative analysis of differences in the exchange activity under various conditions.


    Related Citations: 
    • A novel bipartite phospholipid-binding module in the neurofibromatosis type 1 protein
      D'Angelo, I.,Welti, S.,Bonneau, F.,Scheffzek, K.
      (2006) Embo Rep. 7: 174


    Organizational Affiliation

    Structural and Computational Biology, Developmental Biology and Gene Expression Units, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Neurofibromin
A, B
277Homo sapiensMutation(s): 0 
Gene Names: NF1
Find proteins for P21359 (Homo sapiens)
Go to Gene View: NF1
Go to UniProtKB:  P21359
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
POP
Query on POP

Download SDF File 
Download CCD File 
B
PYROPHOSPHATE 2-
H2 O7 P2
XPPKVPWEQAFLFU-UHFFFAOYSA-L
 Ligand Interaction
PEV
Query on PEV

Download SDF File 
Download CCD File 
A, B
(1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE
PHOSPHATIDYLETHANOLAMINE; 1-PALMITOYL-2-OLEOYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE
C39 H78 N O8 P
RPJZYOHZALDGKI-QNGWXLTQSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.254 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 110.100α = 90.00
b = 110.100β = 90.00
c = 121.900γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
CNSrefinement
MOSFLMdata reduction
CNSphasing
REFMACrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance