4Q5V

Crystal structure of the catalytic core of human DNA polymerase alpha in ternary complex with an RNA-primed DNA template and aphidicolin

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 

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Literature

Structural basis for inhibition of DNA replication by aphidicolin.

Baranovskiy, A.G., Babayeva, N.D., Suwa, Y., Gu, J., Pavlov, Y.I., Tahirov, T.H.

(2014) Nucleic Acids Res 42: 14013-14021

  • DOI: https://doi.org/10.1093/nar/gku1209
  • Primary Citation of Related Structures:  
    4Q5V

  • PubMed Abstract: 

    • Natural tetracyclic diterpenoid aphidicolin is a potent and specific inhibitor of B-family DNA polymerases, haltering replication and possessing a strong antimitotic activity in human cancer cell lines. Clinical trials revealed limitations of aphidicolin as an antitumor drug because of its low solubility and fast clearance from human plasma ...

    Natural tetracyclic diterpenoid aphidicolin is a potent and specific inhibitor of B-family DNA polymerases, haltering replication and possessing a strong antimitotic activity in human cancer cell lines. Clinical trials revealed limitations of aphidicolin as an antitumor drug because of its low solubility and fast clearance from human plasma. The absence of structural information hampered the improvement of aphidicolin-like inhibitors: more than 50 modifications have been generated so far, but all have lost the inhibitory and antitumor properties. Here we report the crystal structure of the catalytic core of human DNA polymerase α (Pol α) in the ternary complex with an RNA-primed DNA template and aphidicolin. The inhibitor blocks binding of dCTP by docking at the Pol α active site and by rotating the template guanine. The structure provides a plausible mechanism for the selectivity of aphidicolin incorporation opposite template guanine and explains why previous modifications of aphidicolin failed to improve its affinity for Pol α. With new structural information, aphidicolin becomes an attractive lead compound for the design of novel derivatives with enhanced inhibitory properties for B-family DNA polymerases.

    Organizational Affiliation: 

    Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198, USA ttahirov@unmc.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase alpha catalytic subunitA,
D [auth E]		922Homo sapiensMutation(s): 1 
Gene Names: POLA1, POLA
EC: 2.7.7.7
UniProt & NIH Common Fund Data Resources
Find proteins for P09884 (Homo sapiens)
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Go to UniProtKB:  P09884
PHAROS:  P09884
Entity Groups  
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UniProt GroupP09884
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
RNA primerB,
E [auth F]		11N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA templateC,
F [auth G]		21N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2ZE
Query on 2ZE
Download Ideal Coordinates CCD File 
G [auth A],
H [auth E]		(3R,4R,4aR,6aS,8R,9R,11aS,11bS)-4,9-bis(hydroxymethyl)-4,11b-dimethyltetradecahydro-8,11a-methanocyclohepta[a]naphthale ne-3,9-diol
C20 H34 O4
NOFOAYPPHIUXJR-APNQCZIXSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
2ZE BindingDB:  4Q5V IC50: min: 2400, max: 1.60e+4 (nM) from 5 assay(s)
EC50: 2000 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.051α = 90
b = 116.432β = 90
c = 233.026γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-26
    Type: Initial release
  • Version 1.1: 2014-12-10
    Changes: Database references
  • Version 1.2: 2015-01-07
    Changes: Database references