Experimental Data Snapshot

  • Resolution: 0.97 Å
  • R-Value Observed: 0.116 

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This is version 1.3 of the entry. See complete history


Structure of dethiobiotin synthetase at 0.97 A resolution.

Sandalova, T.Schneider, G.Kack, H.Lindqvist, Y.

(1999) Acta Crystallogr D Biol Crystallogr 55: 610-624

  • DOI: https://doi.org/10.1107/s090744499801381x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The crystal structure of the 224-residue protein dethiobiotin synthetase from Escherichia coli has been refined using X-ray diffraction data at 0.97 A resolution at 100 K. The model, consisting of 4143 protein atoms including 1859 H atoms and 436 solvent sites, was refined to a final R factor of 11.6% for all reflections, and has an estimated mean standard uncertainty for the atomic positions of 0.022 A, derived from inversion of the blocked matrix. The structure was refined with a full anisotropic model for the atomic displacement parameters using SHELX97. Stereochemical restraints were applied throughout the refinement. In the last cycles, the planarity of the peptide bonds was not restrained, resulting in a mean omega value of 179.6 degrees. Analysis of the most anisotropic regions of the protein shows that they form four clusters of residues. Alternate conformations for the side chains of 15 residues and for the main-chain atoms of six residues from three loops were included in the model. An analysis of C-HcO hydrogen bonds shows that such interactions occur rather frequently in DTBS; in total, 16 such hydrogen bonds were found. In the central beta-sheet, 13 C-HcO bonds between carbonyl O and Calpha H atoms were found. Other interactions of this type involve main-chain-side-chain and side-chain-side-chain C-HcO bonds. The model includes 436 water sites, of which 233 molecules form the first hydration shell. Analysis of the protein-solvent interactions shows that about one third of the accessible surface of the enzyme is not covered by ordered solvent. No difference in propensity for ordered solvent close to hydrophilic or hydrophobic surface areas was found. The comparison of the 100 K structure with the structure of the enzyme determined at room temperature shows several regions with different conformation, including areas in the active site, suggesting that structural transitions can occur during flash freezing. This observation questions one of the basic assumptions in the analysis of enzymatic reaction mechanisms using cryocrystallography.

  • Organizational Affiliation

    Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177 Stockholm, Sweden. tanja@alfa.mbb.ki.se

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DETHIOBIOTIN SYNTHASE224Escherichia coliMutation(s): 0 
Find proteins for P13000 (Escherichia coli (strain K12))
Explore P13000 
Go to UniProtKB:  P13000
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13000
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 0.97 Å
  • R-Value Observed: 0.116 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.447α = 90
b = 47.812β = 107.24
c = 61.202γ = 90
Software Package:
Software NamePurpose
SHELXL-97model building
X-PLORmodel building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-06-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2023-08-09
    Changes: Data collection, Database references, Other, Refinement description