Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors and generated by PQS (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 2 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 65698.34 
• Atom Count: 4439 
• Residue Count: 556 
• Unique protein chains: 1

1OIZ

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

• DOI: 10.2210/pdb1OIZ/pdb

• Classification: TRANSPORT
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2003-06-27 Released: 2004-01-14 
• Deposition Author(s): Meier, R., Tomizaki, T., Schulze-Briese, C., Baumann, U., Stocker, A.

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Experimental Data Snapshot

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

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

• PubMed: 12899840 
• Primary Citation of Related Structures:  
  1OIP
• Also Cited By: 1XGH


• 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. 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.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ALPHA-TOCOPHEROL TRANSFER PROTEIN	A, B	278	Homo sapiens	Mutation(s): 0  Gene Names: TTPA (TPP1)
Find proteins for P49638 (Homo sapiens) Go to Gene View: TTPA Go to UniProtKB:  P49638

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
TRT	A, B	FRAGMENT OF TRITON X-100 1-{2-[2-(2-METHOXYETHOXY)ETHOXY]ETHOXY}-4-(1,1,3,3-TETRAMETHYLBUTYL)BENZENE C21 H36 O4 HEUDUECKTWTQQR-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.88 Å
• R-Value Free: 0.226 
• R-Value Work: 0.195 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 45.144	α = 90.00
b = 113.775	β = 98.95
c = 67.433	γ = 90.00

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-06-27 
• Released Date: 2004-01-14 
• Deposition Author(s): Meier, R., Tomizaki, T., Schulze-Briese, C., Baumann, U., Stocker, A.

Revision History 

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