1OVB

THE MECHANISM OF IRON UPTAKE BY TRANSFERRINS: THE STRUCTURE OF AN 18KD NII-DOMAIN FRAGMENT AT 2.3 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The mechanism of iron uptake by transferrins: the structure of an 18 kDa NII-domain fragment from duck ovotransferrin at 2.3 A resolution.

Lindley, P.F.Bajaj, M.Evans, R.W.Garratt, R.C.Hasnain, S.S.Jhoti, H.Kuser, P.Neu, M.Patel, K.Sarra, R.Strange, R.Walton, A.

(1993) Acta Crystallogr.,Sect.D 49: 292-304

  • DOI: 10.1107/S0907444992012101

  • PubMed Abstract: 
  • The molecular structure of an iron-containing 18 kDa fragment of duck ovotransferrin, obtained by proteolysis of the intact protein, has been elucidated by protein crystallographic techniques at 2.3 A resolution. This structure supports a mechanism o ...

    The molecular structure of an iron-containing 18 kDa fragment of duck ovotransferrin, obtained by proteolysis of the intact protein, has been elucidated by protein crystallographic techniques at 2.3 A resolution. This structure supports a mechanism of iron uptake in the intact protein whereby the binding of the synergistic (bi)carbonate anion is followed by binding of the metal with the lobe in the open configuration. These stages are then followed by domain closure in which the aspartic acid residue plays a further key role, by forming an interdomain hydrogen-bond interaction in addition to serving as a ligand to the iron. This essential dual role is highlighted by model building studies on the C-terminal lobe of a known human variant. In this variant a mutation of a glycine by an arginine residue enables the aspartic acid to form an ion pair and reduce its effectiveness for both metal binding and domain closure. The X-ray structure of the 18 kDa fragment strongly suggests that the histidine residue present at the iron binding site of the intact protein and arising from the second interdomain connecting strand has been removed during the preparative proteolysis.


    Related Citations: 
    • New Perspectives on the Structure and Function of Transferrins
      Baker, E.N.,Lindley, P.F.
      (1992) J.Inorg.Biochem. 47: 147
    • Molecular Structure of Serum Transferrin at 3.3 Angstroms Resolution
      Bailey, S.,Evans, R.W.,Garratt, R.C.,Gorinsky, B.,Hasnain, S.,Horsburgh, C.,Jhoti, H.,Lindley, P.F.,Mydin, A.,Sarra, R.,Watson, J.L.
      (1988) Biochemistry 27: 5804
    • High-Resolution X-Ray Studies on Rabbit Serum Transferrin-Preliminary Structure Analysis of the N-Terminal Half-Molecule at 2.3 Angstroms Resolution
      Sarra, R.,Garratt, R.,Gorinsky, B.,Jhoti, H.,Lindley, P.
      (1990) Acta Crystallogr.,Sect.B 46: 763


    Organizational Affiliation

    SERC Daresbury Laboratory, Warrington, Cheshire, England.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
OVOTRANSFERRIN
A
159Anas platyrhynchosN/A
Find proteins for P56410 (Anas platyrhynchos)
Go to UniProtKB:  P56410
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FE
Query on FE

Download SDF File 
Download CCD File 
A
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
CO3
Query on CO3

Download SDF File 
Download CCD File 
A
CARBONATE ION
C O3
BVKZGUZCCUSVTD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.195 
  • Space Group: P 31
Unit Cell:
Length (Å)Angle (°)
a = 41.500α = 90.00
b = 41.500β = 90.00
c = 81.900γ = 120.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance