1RYX

Crystal structure of hen serum transferrin in apo- form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • 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 1.3 of the entry. See complete history


Literature

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: 10.1016/j.bbrc.2004.02.165
  • Primary Citation of Related Structures:  
    1RYX

  • 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 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.


    Related Citations: 
    • Structure of Diferric hen Serum Transferrin at 2.8 A Resolution
      Guha Thakurta, P., Choudhury, D., Dasgupta, R., Dattagupta, J.K.
      (2003) Acta Crystallogr D Biol Crystallogr 59: 1773

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OvotransferrinA686Gallus gallusMutation(s): 0 
UniProt
Find proteins for P02789 (Gallus gallus)
Explore P02789 
Go to UniProtKB:  P02789
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

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