2IHF

Crystal structure of deletion mutant delta 228-252 R190A of the single-stranded DNA binding protein from Thermus aquaticus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

3D structure of Thermus aquaticus single-stranded DNA-binding protein gives insight into the functioning of SSB proteins.

Fedorov, R.Witte, G.Urbanke, C.Manstein, D.J.Curth, U.

(2006) Nucleic Acids Res. 34: 6708-6717

  • DOI: 10.1093/nar/gkl1002
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In contrast to the majority of tetrameric SSB proteins, the recently discovered SSB proteins from the Thermus/Deinoccus group form dimers. We solved the crystal structures of the SSB protein from Thermus aquaticus (TaqSSB) and a deletion mutant of th ...

    In contrast to the majority of tetrameric SSB proteins, the recently discovered SSB proteins from the Thermus/Deinoccus group form dimers. We solved the crystal structures of the SSB protein from Thermus aquaticus (TaqSSB) and a deletion mutant of the protein and show the structure of their ssDNA binding domains to be similar to the structure of tetrameric SSBs. Two conformations accompanied by proline cis-trans isomerization are observed in the flexible C-terminal region. For the first time, we were able to trace 6 out of 10 amino acids at the C-terminus of an SSB protein. This highly conserved region is essential for interaction with other proteins and we show it to adopt an extended conformation devoid of secondary structure. A model for binding this region to the chi subunit of DNA polymerase III is proposed. It explains at a molecular level the reason for the ssb113 phenotype observed in Escherichia coli.


    Organizational Affiliation

    Institute for Biophysical Chemistry, Hannover Medical Schoo,l Carl-Neuberg-Strasse 1, D-30625 Hannover, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Single-stranded DNA-binding protein
A
239Thermus aquaticusMutation(s): 1 
Gene Names: ssb
Find proteins for Q9KH06 (Thermus aquaticus)
Go to UniProtKB:  Q9KH06
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.222 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 67.633α = 90.00
b = 80.423β = 90.00
c = 97.783γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
AMoREphasing
CNSrefinement
MAR345dtbdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-01-02
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance