Biological Assembly 1  

 3D View: Structure | Electron Density

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Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 77799.00 
• Atom Count: 3671 
• Residue Count: 718 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

1EQQ

SINGLE STRANDED DNA BINDING PROTEIN AND SSDNA COMPLEX

• DOI: 10.2210/pdb1EQQ/pdb
• NDB: PR0048

• Classification: REPLICATION/RNA
• Organism(s): Escherichia coli (strain K12)
• Expression System: Escherichia coli


• Deposited: 2000-04-06 Released: 2003-09-23 
• Deposition Author(s): Matsumoto, T., Morimoto, Y., Shibata, N., Yasuoka, N., Shimamoto, N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.339 
• R-Value Work: 0.213 

Literature

Roles of functional loops and the C-terminal segment of a single-stranded DNA binding protein elucidated by X-Ray structure analysis

Matsumoto, T., Morimoto, Y., Shibata, N., Kinebuchi, T., Shimamoto, N., Tsukihara, T., Yasuoka, N.

(2000) J.Biochem.(Tokyo) 127: 329-335

• PubMed: 10731701 
• Primary Citation of Related Structures:  
  1QVC
• Also Cited By: 4MZ9


• PubMed Abstract: 
  

The single-stranded DNA (ssDNA) binding protein from Escherichia coli (EcoSSB) plays a central role in DNA replication, recombination and repair. The tertiary structure of EcoSSB was determined at 2.2 A resolution. This is rather higher resolution than previously reported. Crystals were grown from the homogeneous intact protein but the EcoSSB tetramer in the crystals contains truncated subunits lacking a part of the C-terminal. The structure determined includes biologically important flexible loops and C-terminal regions, and revealed the existence of concavities. These concavities include the residues important for ssDNA binding. An ssDNA can be fitted on the concavities and further stabilized through interactions with the loops forming flexible lids. It seems likely to play a central role in the binding of ssDNA.

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Organizational Affiliation: 

Department of Life Science, Himeji Institute of Technology, Kamigori, Ako-gun, Hyogo 678-1297, Japan.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
SINGLE STRANDED DNA BINDING PROTEIN	A, B, C, D	178	Escherichia coli (strain K12)	Mutation(s): 0  Gene Names: ssb (exrB, lexC)
Find proteins for P0AGE0 (Escherichia coli (strain K12)) Go to UniProtKB:  P0AGE0

Entity ID: 1
Molecule	Chains	Length	Organism
5'-R(*(5MU)P*(5MU)P*(5MU))-3'	M,N	3	N/A

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
5MU	M, N	RNA LINKING	C10 H15 N2 O9 P		U

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.339 
• R-Value Work: 0.213 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 101.714	α = 90.00
b = 60.473	β = 112.60
c = 94.733	γ = 90.00

Software Package:

Software Name	Purpose
CNS	refinement
CNS	phasing
MOSFLM	data reduction
SCALA	data scaling
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-04-06 
• Released Date: 2003-09-23 
• Deposition Author(s): Matsumoto, T., Morimoto, Y., Shibata, N., Yasuoka, N., Shimamoto, N.

Revision History 

• Version 1.0: 2003-09-23
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2018-04-04
  Type: Data collection