Experimental Data Snapshot

  • Resolution: 0.93 Å
  • R-Value Free: 0.205 
  • R-Value Observed: 0.153 

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Ab initio solution and refinement of two high-potential iron protein structures at atomic resolution.

Parisini, E.Capozzi, F.Lubini, P.Lamzin, V.Luchinat, C.Sheldrick, G.M.

(1999) Acta Crystallogr D Biol Crystallogr 55: 1773-1784

  • DOI: https://doi.org/10.1107/s0907444999009129
  • Primary Citation of Related Structures:  
    1B0Y, 1CKU

  • PubMed Abstract: 

    The crystal structure of the reduced high-potential iron protein (HiPIP) from Chromatium vinosum has been redetermined in a new orthorhombic crystal modification, and the structure of its H42Q mutant has been determined in orthorhombic (H42Q-1) and cubic (H42Q-2) modifications. The first two were solved by ab initio direct methods using data collected to atomic resolution (1.20 and 0. 93 A, respectively). The recombinant wild type (rc-WT) with two HiPIP molecules in the asymmetric unit has 1264 protein atoms and 335 solvent sites, and is the second largest structure reported so far that has been solved by pure direct methods. The solutions were obtained in a fully automated way and included more than 80% of the protein atoms. Restrained anisotropic refinement for rc-WT and H42Q-1 converged to R(1) = summation operator||F(o)| - |F(c)|| / summation operator|F(o)| of 12.0 and 13.6%, respectively [data with I > 2sigma(I)], and 12.8 and 15.5% (all data). H42Q-2 contains two molecules in the asymmetric unit and diffracted only to 2.6 A. In both molecules of rc-WT and in the single unique molecule of H42Q-1 the [Fe(4)S(4)](2+) cluster dimensions are very similar and show a characteristic tetragonal distortion with four short Fe-S bonds along four approximately parallel cube edges, and eight long Fe-S bonds. The unique protein molecules in H42Q-2 and rc-WT are also very similar in other respects, except for the hydrogen bonding around the mutated residue that is at the surface of the protein, supporting the hypothesis that the difference in redox potentials at lower pH values is caused primarily by differences in the charge distribution near the surface of the protein rather than by structural differences in the cluster region.

  • Organizational Affiliation

    Institut für Anorganische Chemie, University of Göttingen, Tammannstrasse 4, D-37077, Göttingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (HIPIP)85Allochromatium vinosumMutation(s): 1 
Find proteins for P00260 (Allochromatium vinosum (strain ATCC 17899 / DSM 180 / NBRC 103801 / NCIMB 10441 / D))
Explore P00260 
Go to UniProtKB:  P00260
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00260
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SF4

Download Ideal Coordinates CCD File 
Fe4 S4
Experimental Data & Validation

Experimental Data

  • Resolution: 0.93 Å
  • R-Value Free: 0.205 
  • R-Value Observed: 0.153 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.681α = 90
b = 41.675β = 90
c = 41.913γ = 90
Software Package:
Software NamePurpose
SHELXmodel building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-12-16
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2016-02-17
    Changes: Atomic model, Derived calculations
  • Version 1.4: 2021-11-03
    Changes: Data collection, Database references, Derived calculations
  • Version 1.5: 2023-12-27
    Changes: Data collection