Experimental Data Snapshot

  • Resolution: 1.30 Å
  • R-Value Free: 0.157 
  • R-Value Work: 0.133 
  • R-Value Observed: 0.133 

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Sampling of the native conformational ensemble of myoglobin via structures in different crystalline environments.

Kondrashov, D.A.Zhang, W.Aranda, R.Stec, B.Phillips Jr., G.N.

(2008) Proteins 70: 353-362

  • DOI: https://doi.org/10.1002/prot.21499
  • Primary Citation of Related Structures:  
    1JW8, 1U7R, 1U7S

  • PubMed Abstract: 

    Proteins sample multiple conformational substates in their native environment, but the process of crystallization selects the conformers that allow for close packing. The population of conformers can be shifted by varying the environment through a range of crystallization conditions, often resulting in different space groups and changes in the packing arrangements. Three high resolution structures of myoglobin (Mb) in different crystal space groups are presented, including one in a new space group P6(1)22 and two structures in space groups P2(1)2(1)2(1) and P6. We compare coordinates and anisotropic displacement parameters (ADPs) from these three structures plus an existing structure in space group P2(1). While the overall changes are small, there is substantial variation in several external regions with varying patterns of crystal contacts across the space group packing arrangements. The structural ensemble containing four different crystal forms displays greater conformational variance (Calpha rmsd of 0.54-0.79 A) in comparison to a collection of four Mb structures with different ligands and mutations in the same crystal form (Calpha rmsd values of 0.28-0.37 A). The high resolution of the data enables comparison of both the magnitudes and directions of ADPs, which are found to be suppressed by crystal contacts. A composite dynamic profile of Mb structural variation from the four structures was compared with an independent structural ensemble developed from NMR refinement. Despite the limitations and biases of each method, the ADPs of the crystallographic ensemble closely match the positional variance from the solution NMR ensemble with linear correlation of 0.8. This suggests that crystal packing selects conformers representative of the solution ensemble, and several different crystal forms give a more complete view of the plasticity of a protein structure.

  • Organizational Affiliation

    Department of Biochemistry, University of Wisconsin - Madison, Madison, Wisconsin 53706, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MYOGLOBIN154Physeter catodonMutation(s): 0 
Gene Names: MB (Synthesized)MB
Find proteins for P02185 (Physeter macrocephalus)
Explore P02185 
Go to UniProtKB:  P02185
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02185
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.30 Å
  • R-Value Free: 0.157 
  • R-Value Work: 0.133 
  • R-Value Observed: 0.133 
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.38α = 90
b = 90.38β = 90
c = 45.34γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-10-10
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2013-01-30
    Changes: Database references, Structure summary
  • Version 1.4: 2017-10-04
    Changes: Refinement description