2D3I

Crystal Structure of Aluminum-Bound Ovotransferrin at 2.15 Angstrom Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of aluminium-bound ovotransferrin at 2.15 Angstroms resolution.

Mizutani, K.Mikami, B.Aibara, S.Hirose, M.

(2005) Acta Crystallogr.,Sect.D 61: 1636-1642

  • DOI: 10.1107/S090744490503266X

  • PubMed Abstract: 
  • Transferrin, well known as an iron-transport protein, can bind other metal ions, including toxic ones, and is considered to play an important role in the transportation of such metal ions. Here, a crystal structure of aluminium-bound transferrin is d ...

    Transferrin, well known as an iron-transport protein, can bind other metal ions, including toxic ones, and is considered to play an important role in the transportation of such metal ions. Here, a crystal structure of aluminium-bound transferrin is described for the first time. Colourless needle-shaped crystals of aluminium-bound ovotransferrin were obtained in PEG 400 solution. Structural determination was performed by molecular replacement using diferric (iron-bound) ovotransferrin as a model and the structural refinement was performed in the 50-2.15 Angstroms resolution range. The overall organization of the aluminium-bound form is almost the same as the iron-bound form: the protein is folded into two homologous lobes (N- and C-lobes) with two domains; two metal-binding sites are located within the inter-domain clefts of each lobe. Four residues (one Asp, two Tyr and one His) and one bicarbonate anion were found to bind an aluminium ion in either lobe, as in the iron-bound form. The highly similar domain-closed structure of the Al(3+)-bound form may permit the binding of Al(3+)-bound transferrin to the transferrin receptor. An unusual interaction, the dilysine trigger, which facilitates iron release at low pH in the endosome, was also found in the Al(3+)-bound form. These findings support the participation of transferrin in the transport of Al(3+) ions in vivo.


    Organizational Affiliation

    Laboratory of Applied Structural Biology, Division of Applied Life Sciences, The Graduate School of Agriculture, Kyoto University, Uji, Japan. kmizuatani@kais-kyoto-u.ac.jp




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ovotransferrin
A
686Gallus gallusMutation(s): 0 
Find proteins for P02789 (Gallus gallus)
Go to UniProtKB:  P02789
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AL
Query on AL

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Download CCD File 
A
ALUMINUM ION
Al
REDXJYDRNCIFBQ-UHFFFAOYSA-N
 Ligand Interaction
BCT
Query on BCT

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Download CCD File 
A
BICARBONATE ION
C H O3
BVKZGUZCCUSVTD-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 72.353α = 90.00
b = 59.184β = 95.72
c = 87.974γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
CCP4phasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-11-29
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance