1SRU

Crystal structure of full length E. coli SSB protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.288 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The C-terminal domain of full-length E. coli SSB is disordered even when bound to DNA.

Savvides, S.N.Raghunathan, S.Fuetterer, K.Kozlov, A.G.Lohman, T.M.Waksman, G.

(2004) Protein Sci. 13: 1942-1947

  • DOI: 10.1110/ps.04661904

  • PubMed Abstract: 
  • The crystal structure of full-length homotetrameric single-stranded DNA (ssDNA)-binding protein from Escherichia coli (SSB) has been determined to 3.3 A resolution and reveals that the entire C-terminal domain is disordered even in the presence of ss ...

    The crystal structure of full-length homotetrameric single-stranded DNA (ssDNA)-binding protein from Escherichia coli (SSB) has been determined to 3.3 A resolution and reveals that the entire C-terminal domain is disordered even in the presence of ssDNA. To our knowledge, this is the first experimental evidence that the C-terminal domain of SSB may be inherently disordered. The N-terminal DNA-binding domain of the protein is well ordered and is virtually indistinguishable from the previously determined structure of the chymotryptic fragment of SSB (SSBc) in complex with ssDNA. The absence of observable interactions with the core protein and the crystal packing of SSB together suggest that the disordered C-terminal domains likely extend laterally away from the DNA- binding domains, which may facilitate interactions with components of the replication machinery in vivo. The structure also reveals the conservation of molecular contacts between successive tetramers mediated by the L(45) loops as seen in two other crystal forms of SSBc, suggesting a possible functional relevance of this interaction.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Single-strand binding protein
A, B, C, D
113Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: ssb (exrB, lexC)
Find proteins for P0AGE0 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AGE0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.288 
  • Space Group: P 31 1 2
Unit Cell:
Length (Å)Angle (°)
a = 60.850α = 90.00
b = 60.850β = 90.00
c = 348.920γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
DENZOdata reduction
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-03
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance