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Title: Structural basis for inhibition of DNA replication by aphidicolin

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gku1209· OSTI ID:1168507
 [1];  [1];  [1];  [1];  [2];  [1]
  1. Univ. of Nebraska Medical Center, Omaha, NE (United States). Eppley Inst. for Research in Cancer and Allied Diseases
  2. Univ. of Nebraska Medical Center, Omaha, NE (United States). Eppley Inst. for Research in Cancer and Allied Diseases, Dept. of Biochemistry and Molecular Biology and Dept. of Pathology and Microbiology

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC); National Institute of General Medical Sciences; National Cancer Institute (NCI)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1168507
Journal Information:
Nucleic Acids Research, Vol. 42, Issue 22; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 82 works
Citation information provided by
Web of Science

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Cited By (23)

Studies on Addition of Glass Filler to Caries Preventive Sealing Material journal January 1971
Stability of cytoplasmic nanoviscosity during cell cycle of HeLa cells synchronized with Aphidicolin journal November 2019
Role of the Polymerase ϵ sub-unit DPB2 in DNA replication, cell cycle regulation and DNA damage response in Arabidopsis journal May 2016
Nuclear transport of nicotinamide phosphoribosyltransferase is cell cycle–dependent in mammalian cells, and its inhibition slows cell growth journal April 2019
Inhibition of cell proliferation does not slow down echinoderm neural regeneration posted_content July 2016
Common Chemical Inductors of Replication Stress: Focus on Cell‐Based Studies journal February 2017
Crosstalk between repair pathways elicits double-strand breaks in alkylated DNA and implications for the action of temozolomide journal July 2021
Insights into DNA polymerase δ’s mechanism for accurate DNA replication journal February 2019
A High-Throughput Assay for DNA Replication Inhibitors Based upon Multivariate Analysis of Yeast Growth Kinetics journal February 2019
Inhibitors of GLUT/SLC2A Enhance the Action of BCNU and Temozolomide against High-Grade Gliomas journal April 2017
Crosstalk between repair pathways elicits Double-Strand Breaks in alkylated DNA: implications for the action of temozolomide journal April 2021
Elaborated Action of the Human Primosome journal February 2017
Human DNA polymerase α in binary complex with a DNA:DNA template-primer journal April 2016
The antitumor toxin CD437 is a direct inhibitor of DNA polymerase α journal May 2016
Targeting DNA repair with aphidicolin sensitizes primary chronic lymphocytic leukemia cells to purine analogs journal May 2016
Viral DNA Replication Orientation and hnRNPs Regulate Transcription of the Human Papillomavirus 18 Late Promoter journal July 2017
Inhibition of cell proliferation does not slow down echinoderm neural regeneration journal February 2017
Identification of a New Equid Herpesvirus 1 DNA Polymerase (ORF30) Genotype with the Isolation of a C2254/H752 Strain in French Horses Showing no Major Impact on the Strain Behaviour journal October 2020
Strand break-induced replication fork collapse leads to C-circles, C-overhangs and telomeric recombination journal February 2019
Crystal structure of the human Polϵ B-subunit in complex with the C-terminal domain of the catalytic subunit journal July 2017
Visualizing locus-specific sister chromatid exchange reveals differential patterns of replication stress-induced fragile site breakage journal October 2019
Distribution and effects of amino acid changes in drug-resistant α and β herpesviruses DNA polymerase journal September 2016
Application of the adverse outcome pathway framework to genotoxic modes of action journal October 2019

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