3E0D

Insights into the Replisome from the Crystral Structure of the Ternary Complex of the Eubacterial DNA Polymerase III alpha-subunit

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.60 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.287 

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Literature

Insights into the Replisome from the Structure of a Ternary Complex of the DNA Polymerase III alpha-Subunit.

Wing, R.A., Bailey, S., Steitz, T.A.

(2008) J Mol Biol 382: 859-869

  • DOI: 10.1016/j.jmb.2008.07.058
  • Primary Citation of Related Structures:  
    3E0D

  • PubMed Abstract: 

    • The crystal structure of the catalytic alpha-subunit of the DNA polymerase III (Pol IIIalpha) holoenzyme bound to primer-template DNA and an incoming deoxy-nucleoside 5'-triphosphate has been determined at 4.6-A resolution. The polymerase interacts with the sugar-phosphate backbone of the DNA across its minor groove, which is made possible by significant movements of the thumb, finger, and beta-binding domains relative to their orientations in the unliganded polymerase structure ...

    The crystal structure of the catalytic alpha-subunit of the DNA polymerase III (Pol IIIalpha) holoenzyme bound to primer-template DNA and an incoming deoxy-nucleoside 5'-triphosphate has been determined at 4.6-A resolution. The polymerase interacts with the sugar-phosphate backbone of the DNA across its minor groove, which is made possible by significant movements of the thumb, finger, and beta-binding domains relative to their orientations in the unliganded polymerase structure. Additionally, the DNA and incoming nucleotide are bound to the active site of Pol IIIalpha nearly identically as they are in their complex with DNA polymerase beta, thereby proving that the eubacterial replicating polymerase, but not the eukaryotic replicating polymerase, is homologous to DNA polymerase beta. Finally, superimposing a recent structure of the clamp bound to DNA on this Pol IIIalpha complex with DNA places a loop of the beta-binding domain into the appropriate clamp cleft and supports a mechanism of polymerase switching.

    Organizational Affiliation: 

    Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase III subunit alphaE [auth A],
F [auth B]		1220Thermus aquaticusMutation(s): 6 
Gene Names: dnaE
EC: 2.7.7.7
UniProt
Find proteins for Q9XDH5 (Thermus aquaticus)
Explore Q9XDH5 
Go to UniProtKB:  Q9XDH5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9XDH5
Protein Feature View
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA substrate template strandA [auth C],
C [auth E]		27N/A
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA substrate primer strandB [auth D],
D [auth F]		21N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DTP
Query on DTP
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H [auth A],
J [auth B]		2'-DEOXYADENOSINE 5'-TRIPHOSPHATE
C10 H16 N5 O12 P3
SUYVUBYJARFZHO-RRKCRQDMSA-N		 Ligand Interaction
CA
Query on CA
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G [auth A],
I [auth B]		CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.60 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.287 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 149.546α = 90
b = 149.546β = 90
c = 163.338γ = 90
Software Package:
Software NamePurpose
CNSrefinement

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-10-20
    Changes: Data collection, Database references, Derived calculations