Crystal structure of hen serum transferrin in apo- form

Experimental Data Snapshot

  • Resolution: 3.50 Å
  • R-Value Free: 0.341 
  • R-Value Work: 0.283 
  • R-Value Observed: 0.283 

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This is version 1.4 of the entry. See complete history


Tertiary structural changes associated with iron binding and release in hen serum transferrin: a crystallographic and spectroscopic study

Thakurta, P.G.Choudhury, D.Dasgupta, R.Dattagupta, J.K.

(2004) Biochem Biophys Res Commun 316: 1124-1131

  • DOI: https://doi.org/10.1016/j.bbrc.2004.02.165
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The iron binding and release of serum transferrin are pH-dependent and accompanied by a conformational change between the iron-bound (holo-) and iron-free (apo-) forms. We have determined the crystal structure of apo-hen serum transferrin (hAST) at 3.5A resolution, which is the first reported structure to date of any full molecule of an apo-serum transferrin and studied its pH-dependent iron release by UV-vis absorption and near UV-CD spectroscopy. The crystal structure of hAST shows that both the lobes adopt an open conformation and the relative orientations of the domains are different from those of apo-human serum transferrin and human apolactoferrin but similar to that of hen apo-ovotransferrin. Spectroscopic analysis reveals that in hen serum transferrin, release of the first iron starts at a pH approximately 6.5 and continues over a broad pH range (6.5-5.2). The complete release of the iron, however, occurs at pH approximately 4.0. The near UV-CD spectra show alterations in the microenvironment of the aromatic residues surrounding the iron-binding sites.

  • Organizational Affiliation

    Crystallography and Molecular Biology Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ovotransferrin686Gallus gallusMutation(s): 0 
Find proteins for P02789 (Gallus gallus)
Explore P02789 
Go to UniProtKB:  P02789
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02789
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.50 Å
  • R-Value Free: 0.341 
  • R-Value Work: 0.283 
  • R-Value Observed: 0.283 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.295α = 90
b = 90.295β = 90
c = 177.666γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-07-13
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-07-11
    Changes: Data collection
  • Version 1.4: 2023-10-25
    Changes: Data collection, Database references, Refinement description