2B3Y

Structure of a monoclinic crystal form of human cytosolic aconitase (IRP1)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 

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This is version 1.2 of the entry. See complete history. 


Literature

Crystal structure of human iron regulatory protein 1 as cytosolic aconitase

Dupuy, J., Volbeda, A., Carpentier, P., Darnault, C., Moulis, J.M., Fontecilla-Camps, J.C.

(2006) Structure 14: 129-139

  • DOI: 10.1016/j.str.2005.09.009
  • Primary Citation of Related Structures:  
    2B3X, 2B3Y

  • PubMed Abstract: 

    • Iron regulatory proteins (IRPs) control the translation of proteins involved in iron uptake, storage and utilization by binding to specific noncoding sequences of the corresponding mRNAs known as iron-responsive elements (IREs). This strong interaction assures proper iron homeostasis in animal cells under iron shortage ...

    Iron regulatory proteins (IRPs) control the translation of proteins involved in iron uptake, storage and utilization by binding to specific noncoding sequences of the corresponding mRNAs known as iron-responsive elements (IREs). This strong interaction assures proper iron homeostasis in animal cells under iron shortage. Conversely, under iron-replete conditions, IRP1 binds a [4Fe-4S] cluster and functions as cytosolic aconitase. Regulation of the balance between the two IRP1 activities is complex, and it does not depend only on iron availability. Here, we report the crystal structure of human IRP1 in its aconitase form. Comparison with known structures of homologous enzymes reveals well-conserved folds and active site environments with significantly different surface shapes and charge distributions. The specific features of human IRP1 allow us to propose a tentative model of an IRP1-IRE complex that agrees with a range of previously obtained data.

    Related Citations: 
    • Crystallization and Preliminary X-Ray Diffraction Data For the Aconitase Form of Human Iron Regulatory Protein 1
      Dupuy, J., DARNAULT, C., BRAZZOLOTTO, X., KUHN, L.C., MOULIS, J.M., Volbeda, A., Fontecilla-Camps, J.C.
      (2005) Acta Crystallogr Sect F Struct Biol Cryst Commun 61: 482
    Organizational Affiliation: 

    Laboratoire de Cristallographie et de Cristallogenèse des Protéines, Institut de Biologie Structurale JP Ebel, CEA/CNRS/Université Joseph Fourier, 38027 Grenoble Cedex 1, France.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Iron-responsive element binding protein 1A, B888Homo sapiensMutation(s): 0 
Gene Names: ACO1, IREB1
EC: 4.2.1.3
UniProt & NIH Common Fund Data Resources
Find proteins for P21399 (Homo sapiens)
Explore P21399 
Go to UniProtKB:  P21399
PHAROS:  P21399
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21399
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.91α = 90
b = 215.47β = 72
c = 64.01γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-01-10
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance