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A human cell extract-based assay for the activation of ATM and ATR checkpoint kinases

Bunsyo Shiotani1, Lee Zou

  • 1Harvard Medical School, Massachusetts General Hospital Cancer Center, Charlestown, MA, USA. bshiotani@partners.org

Methods in Molecular Biology (Clifton, N.J.)
|August 27, 2011
PubMed

Insights

This study presents an in vitro assay to investigate how DNA breaks activate ATM and ATR kinases. The assay reveals that DNA structure dictates the activation of these key DNA damage response proteins.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Ataxia telangiectasia-mutated (ATM) and ATM-Rad3-related (ATR) kinases are crucial for DNA damage response pathways.
  • These kinases regulate cellular responses to various forms of DNA damage, including double-stranded DNA breaks (DSBs).

Purpose of the Study:

  • To describe an in vitro biochemical assay for studying the activation of ATM and ATR kinases by DSBs.
  • To characterize the DNA structural determinants that regulate ATM and ATR activation.

Main Methods:

  • Preparation of nuclear extracts from human cell lines.
  • Generation of diverse DNA fragments (oligonucleotides, plasmids) to serve as stimuli.
  • Incubation of DNA fragments with nuclear extracts to monitor kinase activation.
  • Analysis of ATM and ATR activation via phosphorylation of their specific substrates.

Main Results:

  • The developed assay successfully activates both ATM and ATR kinases in vitro using DNA fragments.
  • Kinase activation is demonstrated to be regulated by the specific structure of the DNA fragments used.
  • This assay provides a tool to dissect the DNA structural requirements for ATM and ATR activation.

Conclusions:

  • The in vitro assay is effective for studying ATM and ATR activation mechanisms.
  • DNA structure plays a critical role in regulating the activation of these essential DNA damage response kinases.
  • This method facilitates the characterization of DNA structural elements influencing ATM and ATR signaling.

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