5FKU

cryo-EM structure of the E. coli replicative DNA polymerase complex in DNA free state (DNA polymerase III alpha, beta, epsilon, tau complex)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.34 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

cryo-EM structures of theE. colireplicative DNA polymerase reveal its dynamic interactions with the DNA sliding clamp, exonuclease andtau.

Fernandez-Leiro, R.Conrad, J.Scheres, S.H.Lamers, M.H.

(2015) Elife 4

  • DOI: 10.7554/eLife.11134
  • Primary Citation of Related Structures:  
    5FKU, 5FKW, 5FKV

  • PubMed Abstract: 
  • The replicative DNA polymerase PolIIIα from Escherichia coli is a uniquely fast and processive enzyme. For its activity it relies on the DNA sliding clamp β, the proofreading exonuclease ε and the C-terminal domain of the clamp loader subunit τ ...

    The replicative DNA polymerase PolIIIα from Escherichia coli is a uniquely fast and processive enzyme. For its activity it relies on the DNA sliding clamp β, the proofreading exonuclease ε and the C-terminal domain of the clamp loader subunit τ. Due to the dynamic nature of the four-protein complex it has long been refractory to structural characterization. Here we present the 8 Å resolution cryo-electron microscopy structures of DNA-bound and DNA-free states of the PolIII-clamp-exonuclease-τ c complex. The structures show how the polymerase is tethered to the DNA through multiple contacts with the clamp and exonuclease. A novel contact between the polymerase and clamp is made in the DNA bound state, facilitated by a large movement of the polymerase tail domain and τ c . These structures provide crucial insights into the organization of the catalytic core of the replisome and form an important step towards determining the structure of the complete holoenzyme.


    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge, United Kingdom.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA POLYMERASE III SUBUNIT ALPHAA1160Escherichia coli K-12Mutation(s): 2 
Gene Names: dnaEpolCb0184JW0179
EC: 2.7.7.7
Find proteins for P10443 (Escherichia coli (strain K12))
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Go to UniProtKB:  P10443
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA POLYMERASE III SUBUNIT BETABC366Escherichia coli K-12Mutation(s): 0 
Gene Names: dnaNb3701JW3678
EC: 2.7.7.7
Find proteins for P0A988 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0A988
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA POLYMERASE III SUBUNIT EPSILOND243Escherichia coli K-12Mutation(s): 4 
Gene Names: dnaQmutDb0215JW0205
EC: 2.7.7.7
Find proteins for P03007 (Escherichia coli (strain K12))
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Go to UniProtKB:  P03007
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA POLYMERASE III SUBUNIT TAUE144Escherichia coli K-12Mutation(s): 0 
Gene Names: dnaXdnaZdnaZXb0470JW0459
EC: 2.7.7.7
Find proteins for P06710 (Escherichia coli (strain K12))
Explore P06710 
Go to UniProtKB:  P06710
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.34 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-11-25
    Type: Initial release
  • Version 1.1: 2016-12-21
    Changes: Database references
  • Version 1.2: 2017-04-19
    Changes: Other
  • Version 1.3: 2019-02-27
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2019-05-08
    Changes: Advisory, Data collection, Derived calculations