1XSX

NMR Structure of Sso10a, a Hyperthermophile DNA-binding Protein with an Extended Anti-parallel Coiled Coil


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 75 
  • Conformers Submitted: 11 
  • Selection Criteria: 10 smallest RMSD out of 13 lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution Structure, Stability, and Flexibility of Sso10a: A Hyperthermophile Coiled-Coil DNA-Binding Protein(,).

Kahsai, M.A.Vogler, B.Clark, A.T.Edmondson, S.P.Shriver, J.W.

(2005) Biochemistry 44: 2822-2832

  • DOI: 10.1021/bi047669t

  • PubMed Abstract: 
  • Sso10a is one of a number of DNA-binding proteins from the hyperthermophile Sulfolobus solfataricus that has been associated with DNA packaging and chromatin regulation. Sequence analysis indicates that it is a member of a conserved group of archaeal ...

    Sso10a is one of a number of DNA-binding proteins from the hyperthermophile Sulfolobus solfataricus that has been associated with DNA packaging and chromatin regulation. Sequence analysis indicates that it is a member of a conserved group of archaeal transcription regulators (COG3432). We have determined the solution structure of Sso10a and show that it is a homodimer of winged-helix DNA-binding domains. The dimer interface consists of an extended antiparallel coiled coil, with the globular DNA-binding domains positioned at opposite ends of a solvent-exposed coiled-coil rod. NMR structure refinement of the elongated structure benefited not only from the inclusion of residual dipolar couplings from partially aligned samples but also the influence of anisotropic rotational diffusion on heteronuclear relaxation. An analysis of backbone mobility using (15)N relaxation rates indicated that the overall tertiary and quaternary structure is largely inflexible on the nanosecond to picosecond time scale. Amide hydrogen exchange data demonstrated that the most stable region of the protein extends from the core of the winged helices into the coiled coil. The positions of the globular heads relative to the coiled coil in solution deviate only slightly from that observed in a crystal structure. The most significant difference between the solution and crystal structures occurs in the putative DNA-binding helix-turn-helix (HTH) motif. This is the region of lowest stability in solution and a point of protein-protein contact in the crystal. Alternative conformations of the HTH motif may permit adjustment of the structure for optimal DNA binding.


    Organizational Affiliation

    Biomolecular Nuclear Magnetic Resonance Laboratory, Department of Chemistry, Graduate Program in Biotechnology Science and Engineering, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sso10a
A, B
95Sulfolobus solfataricusMutation(s): 0 
Gene Names: sso10a
Find proteins for Q5W1E8 (Sulfolobus solfataricus)
Go to UniProtKB:  Q5W1E8
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 75 
  • Conformers Submitted: 11 
  • Selection Criteria: 10 smallest RMSD out of 13 lowest energy 
  • Olderado: 1XSX Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-03-01
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance