Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 23.20 kDa 
• Atom Count: 1515 
• Residue Count: 176 
• Unique protein chains: 1

1TXY

E. coli PriB

• DOI: 10.2210/pdb1TXY/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2004-07-06 Released: 2004-11-16 
• Deposition Author(s): Keck, J.L., Lopper, M., Holton, J.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.285 
• R-Value Work: 0.259 
• R-Value Observed: 0.260 

Literature

Crystal structure of PriB, a component of the Escherichia coli replication restart primosome

Lopper, M., Holton, J.M., Keck, J.L.

(2004) Structure 12: 1967-1975

• PubMed: 15530361 
• DOI: 10.1016/j.str.2004.09.004
• Primary Citation of Related Structures:  
  1TXY


• PubMed Abstract: 
  

Maintenance of genome stability following DNA damage requires origin-independent reinitiation of DNA replication at repaired replication forks. In E. coli, PriA, PriB, PriC, and DnaT play critical roles in recognizing repaired replication forks and reloading the replisome onto the template to reinitiate DNA replication. Here, we report the 2.0 A resolution crystal structure of E. coli PriB, revealing a dimer that consists of a single structural domain formed by two oligonucleotide/oligosaccharide binding (OB) folds. Structural similarity of PriB to single-stranded DNA binding proteins reveals insights into its mechanisms of DNA binding. The structure further establishes a putative protein interaction surface that may contribute to the role of PriB in primosome assembly by facilitating interactions with PriA and DnaT. This is the first high-resolution structure of a protein involved in oriC-independent replisome loading and provides unique insight into mechanisms of replication restart in E. coli.

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Organizational Affiliation: 

Department of Biomolecular Chemistry, University of Wisconsin Medical School, 550 Medical Sciences Center, 1300 University Avenue, Madison, WI 53706, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Primosomal replication protein n	A, B	104	Escherichia coli	Mutation(s): 2  Gene Names: priB, b4201
Find proteins for P07013 (Escherichia coli (strain K12)) Explore P07013  Go to UniProtKB:  P07013

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A,B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.285 
• R-Value Work: 0.259 
• R-Value Observed: 0.260 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.902	α = 90
b = 60.294	β = 90
c = 66.304	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-07-06 
• Released Date: 2004-11-16 
Deposition Author(s): Keck, J.L., Lopper, M., Holton, J.M.

Revision History 

• Version 1.0: 2004-11-16
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Refinement description, Version format compliance