1SWX

Crystal structure of a human glycolipid transfer protein in apo-form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for glycosphingolipid transfer specificity.

Malinina, L.Malakhova, M.L.Teplov, A.Brown, R.E.Patel, D.J.

(2004) Nature 430: 1048-1053

  • DOI: 10.1038/nature02856
  • Primary Citation of Related Structures:  1SX6

  • PubMed Abstract: 
  • Lipid transfer proteins are important in membrane vesicle biogenesis and trafficking, signal transduction and immunological presentation processes. The conserved and ubiquitous mammalian glycolipid transfer proteins (GLTPs) serve as potential regulat ...

    Lipid transfer proteins are important in membrane vesicle biogenesis and trafficking, signal transduction and immunological presentation processes. The conserved and ubiquitous mammalian glycolipid transfer proteins (GLTPs) serve as potential regulators of cell processes mediated by glycosphingolipids, ranging from differentiation and proliferation to invasive adhesion, neurodegeneration and apoptosis. Here we report crystal structures of apo-GLTP (1.65 A resolution) and lactosylceramide-bound (1.95 A) GLTP, in which the bound glycosphingolipid is sandwiched, after adaptive recognition, within a previously unknown two-layer all-alpha-helical topology. Glycosphingolipid binding specificity is achieved through recognition and anchoring of the sugar-amide headgroup to the GLTP recognition centre by hydrogen bond networks and hydrophobic contacts, and encapsulation of both lipid chains, in a precisely oriented manner within a 'moulded-to-fit' hydrophobic tunnel. A cleft-like conformational gating mechanism, involving two interhelical loops and one alpha-helix of GLTP, could enable the glycolipid chains to enter and leave the tunnel in the membrane-associated state. Mutation and functional analyses of residues in the glycolipid recognition centre and within the hydrophobic tunnel support a framework for understanding how GLTPs acquire and release glycosphingolipids during lipid intermembrane transfer and presentation processes.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glycolipid transfer protein
A
209Homo sapiensGene Names: GLTP
Find proteins for Q9NZD2 (Homo sapiens)
Go to Gene View: GLTP
Go to UniProtKB:  Q9NZD2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEX
Query on HEX

Download SDF File 
Download CCD File 
A
HEXANE
C6 H14
VLKZOEOYAKHREP-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.172 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 55.439α = 90.00
b = 35.259β = 115.82
c = 57.507γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata reduction
REFMACrefinement
SOLVEphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-31
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance