2RDJ

Snapshots of a Y-family DNA polymerase in replication: Dpo4 in apo and binary/ternary complex forms

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.221 

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Literature

Snapshots of a Y-family DNA polymerase in replication: substrate-induced conformational transitions and implications for fidelity of Dpo4.

Wong, J.H., Fiala, K.A., Suo, Z., Ling, H.

(2008) J Mol Biol 379: 317-330

  • DOI: 10.1016/j.jmb.2008.03.038
  • Primary Citation of Related Structures:  
    2RDI, 2RDJ

  • PubMed Abstract: 

    • Y-family DNA polymerases catalyze translesion DNA synthesis over damaged DNA. Each Y-family polymerase has a polymerase core consisting of a palm, finger and thumb domain in addition to a fourth domain known as a little finger domain. It is unclear how each domain moves during nucleotide incorporation and what type of conformational changes corresponds to the rate-limiting step previously reported in kinetic studies ...

    Y-family DNA polymerases catalyze translesion DNA synthesis over damaged DNA. Each Y-family polymerase has a polymerase core consisting of a palm, finger and thumb domain in addition to a fourth domain known as a little finger domain. It is unclear how each domain moves during nucleotide incorporation and what type of conformational changes corresponds to the rate-limiting step previously reported in kinetic studies. Here, we present three crystal structures of the prototype Y-family polymerase: apo-Dpo4 at 1.9 A resolution, Dpo4-DNA binary complex and Dpo4-DNA-dTMP ternary complex at 2.2 A resolution. Dpo4 undergoes dramatic conformational changes from the apo to the binary structures with a 131 degrees rotation of the little finger domain relative to the polymerase core upon DNA binding. This DNA-induced conformational change is verified in solution by our tryptophan fluorescence studies. In contrast, the polymerase core retains the same conformation in all three conformationally distinct states. Particularly, the finger domain which is responsible for checking base pairing between the template base and an incoming nucleotide retains a rigid conformation. The inflexibility of the polymerase core likely contributes to the low fidelity of Dpo4, in addition to its loose and solvent-accessible active site. Interestingly, while the binary and ternary complexes of Dpo4 retain an identical global conformation, the aromatic side chains of two conserved tyrosines at the nucleotide-binding site change orientations between the binary and ternary structures. Such local conformational changes may correspond to the rate-limiting step in the mechanism of nucleotide incorporation. Together, the global and local conformational transitions observed in our study provide a structural basis for the distinct kinetic steps of a catalytic cycle of DNA polymerization performed by a Y-family polymerase.

    Organizational Affiliation: 

    Department of Biochemistry, University of Western Ontario, London, Ontario, Canada.



Macromolecules

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase IVE [auth A],
F [auth B]		352N/AMutation(s): 0 
Gene Names: dbh, dpo4
EC: 2.7.7.7
UniProt
Find proteins for Q97W02 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q97W02 
Go to UniProtKB:  Q97W02
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97W02
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (5'-D(*DGP*DGP*DGP*DAP*DCP*DCP*DCP*DTP*DTP*DCP*DGP*DAP*DAP*DT)-3')A [auth C],
C [auth E]		14N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*DTP*DTP*DAP*DTP*DTP*DCP*DGP*DAP*DAP*DGP*DGP*DGP*DTP*DCP*DCP*DC)-3')B [auth D]16N/A
Protein Feature View
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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*DTP*DAP*DTP*DTP*DCP*DGP*DAP*DAP*DGP*DGP*DGP*DTP*DCP*DCP*DC)-3')D [auth F]15N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TMP
Query on TMP
Download Ideal Coordinates CCD File 
I [auth A]THYMIDINE-5'-PHOSPHATE
C10 H15 N2 O8 P
GYOZYWVXFNDGLU-XLPZGREQSA-N		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
J [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
K [auth B],
L [auth B]		CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.221 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.993α = 90
b = 102.51β = 90
c = 106.109γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
MAR345dtbdata collection

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2007-09-24 
  • Released Date: 2008-06-24 
    • Deposition Author(s): Wong, J.H.Y., Ling, H.

Revision History  (Full details and data files)

  • Version 1.0: 2008-06-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2017-10-11
    Changes: Refinement description