2IDO

Structure of the E. coli Pol III epsilon-Hot proofreading complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 

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This is version 1.2 of the entry. See complete history


Literature

Structure of the Escherichia coli DNA polymerase III epsilon-HOT proofreading complex.

Kirby, T.W.Harvey, S.DeRose, E.F.Chalov, S.Chikova, A.K.Perrino, F.W.Schaaper, R.M.London, R.E.Pedersen, L.C.

(2006) J Biol Chem 281: 38466-38471

  • DOI: 10.1074/jbc.M606917200
  • Primary Citation of Related Structures:  
    2IDO

  • PubMed Abstract: 
  • The epsilon subunit of Escherichia coli DNA polymerase III possesses 3'-exonucleolytic proofreading activity. Within the Pol III core, epsilon is tightly bound between the alpha subunit (DNA polymerase) and subunit. Here, we present the crystal structure of epsilon in complex with HOT, the bacteriophage P1-encoded homolog of , at 2 ...

    The epsilon subunit of Escherichia coli DNA polymerase III possesses 3'-exonucleolytic proofreading activity. Within the Pol III core, epsilon is tightly bound between the alpha subunit (DNA polymerase) and subunit. Here, we present the crystal structure of epsilon in complex with HOT, the bacteriophage P1-encoded homolog of , at 2.1 A resolution. The epsilon-HOT interface is defined by two areas of contact: an interaction of the previously unstructured N terminus of HOT with an edge of the epsilon central beta-sheet as well as interactions between HOT and the catalytically important helix alpha1-loop-helix alpha2 motif of epsilon. This structure provides insight into how HOT and, by implication, may stabilize the epsilon subunit, thus promoting efficient proofreading during chromosomal replication.


    Organizational Affiliation

    Laboratory of Structural Biology, National Institute of Environmental Health Sciences/NIH, 111 TW Alexander Drive, Research Triangle Park, NC 27709, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase III epsilon subunitA, C186Escherichia coliMutation(s): 0 
Gene Names: dnaQmutD
EC: 2.7.7.7
UniProt
Find proteins for P03007 (Escherichia coli (strain K12))
Explore P03007 
Go to UniProtKB:  P03007
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03007
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Hot proteinB, D83Escherichia virus P1Mutation(s): 0 
Gene Names: hot
UniProt
Find proteins for Q71T70 (Escherichia phage P1)
Explore Q71T70 
Go to UniProtKB:  Q71T70
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ71T70
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.289α = 90
b = 77.289β = 90
c = 212.978γ = 90
Software Package:
Software NamePurpose
CNSrefinement
StructureStudiodata collection
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-11-14
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance