Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B 

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

Macromolecule Content

• Total Structure Weight: 108.57 kDa 
• Atom Count: 8485 
• Residue Count: 955 
• Unique protein chains: 2

1UNN

Complex of beta-clamp processivity factor and little finger domain of PolIV

• DOI: 10.2210/pdb1UNN/pdb

• Classification: BETA-CLAMP
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2003-09-11 Released: 2003-11-06 
• Deposition Author(s): Bunting, K.A., Roe, S.M., Pearl, L.H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.240 
• R-Value Work: 0.179 

Literature

Structural Basis for Recruitment of Translesion DNA Polymerase Pol Iv/Dinb to the Beta-Clamp

Bunting, K.A., Roe, S.M., Pearl, L.H.

(2003) EMBO J 22: 5883

• PubMed: 14592985 
• DOI: 10.1093/emboj/cdg568
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Y-family DNA polymerases can extend primer strands across template strand lesions that stall replicative polymerases. The poor processivity and fidelity of these enzymes, key to their biological role, requires that their access to the primer-template junction is both facilitated and regulated in order to minimize mutations. These features are believed to be provided by interaction with processivity factors, beta-clamp or proliferating cell nuclear antigen (PCNA), which are also essential for the function of replicative DNA polymerases. The basis for this interaction is revealed by the crystal structure of the complex between the 'little finger' domain of the Y-family DNA polymerase Pol IV and the beta-clamp processivity factor, both from Escherichia coli. The main interaction involves a C-terminal peptide of Pol IV, and is similar to interactions seen between isolated peptides and other processivity factors. However, this first structure of an entire domain of a binding partner with an assembled clamp reveals a substantial secondary interface, which maintains the polymerase in an inactive orientation, and may regulate the switch between replicative and Y-family DNA polymerases in response to a template strand lesion.

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Organizational Affiliation: 

The Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
DNA POLYMERASE III BETA SUBUNIT	A, B	366	Escherichia coli	Mutation(s): 0  EC: 2.7.7.7
Find proteins for P0A988 (Escherichia coli (strain K12)) Go to UniProtKB:  P0A988

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
DNA POLYMERASE IV	C, D	115	Escherichia coli	Mutation(s): 0  EC: 2.7.7.7
Find proteins for Q47155 (Escherichia coli (strain K12)) Go to UniProtKB:  Q47155

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C, D	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.240 
• R-Value Work: 0.179 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 146.451	α = 90
b = 70.117	β = 90
c = 110.916	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-09-11 
• Released Date: 2003-11-06 
Deposition Author(s): Bunting, K.A., Roe, S.M., Pearl, L.H.

Revision History 

• Version 1.0: 2003-11-06
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2019-05-08
  Changes: Data collection, Experimental preparation, Other