1OIZ

The Molecular Basis of Vitamin E Retention: Structure of Human Alpha-Tocopherol Transfer Protein

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

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Literature

The Molecular Basis of Vitamin E Retention: Structure of Human Alpha-Tocopherol Transfer Protein

Meier, R., Tomizaki, T., Schulze-Briese, C., Baumann, U., Stocker, A.

(2003) J Mol Biol 331: 725

  • DOI: 10.1016/s0022-2836(03)00724-1
  • Primary Citation of Related Structures:  
    1OIP, 1OIZ

  • PubMed Abstract: 

    • Alpha-tocopherol transfer protein (alpha-TTP) is a liver protein responsible for the selective retention of alpha-tocopherol from dietary vitamin E, which is a mixture of alpha, beta, gamma, and delta-tocopherols and the corresponding tocotrienols. The alpha-TTP-mediated transfer of alpha-tocopherol into nascent VLDL is the major determinant of plasma alpha-tocopherol levels in humans ...

    Alpha-tocopherol transfer protein (alpha-TTP) is a liver protein responsible for the selective retention of alpha-tocopherol from dietary vitamin E, which is a mixture of alpha, beta, gamma, and delta-tocopherols and the corresponding tocotrienols. The alpha-TTP-mediated transfer of alpha-tocopherol into nascent VLDL is the major determinant of plasma alpha-tocopherol levels in humans. Mutations in the alpha-TTP gene have been detected in patients suffering from low plasma alpha-tocopherol and ataxia with isolated vitamin E deficiency (AVED). The crystal structure of alpha-TTP reveals two conformations. In its closed tocopherol-charged form, a mobile helical surface segment seals the hydrophobic binding pocket. In the presence of detergents, an open conformation is observed, which probably represents the membrane-bound form. The selectivity of alpha-TTP for RRR-alpha-tocopherol is explained from the van der Waals contacts occurring in the lipid-binding pocket. Mapping the known mutations leading to AVED onto the crystal structure shows that no mutations occur directly in the binding pocket.

    Organizational Affiliation: 

    Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne, Switzerland.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-TOCOPHEROL TRANSFER PROTEINA, B278Homo sapiensMutation(s): 0 
Gene Names: TTPA, TPP1
UniProt & NIH Common Fund Data Resources
Find proteins for P49638 (Homo sapiens)
Explore P49638 
Go to UniProtKB:  P49638
PHAROS:  P49638
GTEx:  ENSG00000137561 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49638
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TRT
Query on TRT
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A],
F [auth B],
G [auth B],
C [auth A],
D [auth A],
E [auth A],
F [auth B],
G [auth B],
H [auth B]
FRAGMENT OF TRITON X-100
C21 H36 O4
HEUDUECKTWTQQR-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.144α = 90
b = 113.775β = 98.95
c = 67.433γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance