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DNA demethylase is a processive enzyme.

N Cervoni1, S Bhattacharya, M Szyf

  • 1Department of Pharmacology, McGill University, Montreal, Quebec H3G 1Y6, Canada.

The Journal of Biological Chemistry
|March 20, 1999
PubMed
Summary
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Mammalian DNA demethylase is a processive enzyme that removes methyl groups from DNA. Its initiation is sequence-dependent, explaining global DNA hypomethylation during development.

Area of Science:

  • Epigenetics
  • Molecular Biology
  • Developmental Biology

Background:

  • DNA methylation patterns are crucial for development, regulated by methylation and demethylation.
  • Mammals possess a specific demethylase enzyme responsible for removing methyl groups from cytosines.
  • Genome-wide demethylation is observed during early development and in differentiating cells.

Purpose of the Study:

  • To investigate whether the mammalian DNA demethylase enzyme functions processively.
  • To determine the rate-limiting step in the DNA demethylation process.

Main Methods:

  • Utilized bisulfite mapping techniques to analyze DNA methylation.
  • Assessed the processivity of the demethylase enzyme on methylated cytosines.

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Main Results:

  • Demonstrated that the DNA demethylase enzyme acts processively.
  • Identified the initiation of demethylation as the rate-limiting step.
  • Sequence properties dictate the initiation of demethylation, after which it proceeds processively.

Conclusions:

  • The DNA demethylase enzyme exhibits processive activity.
  • Sequence-specific initiation controls the rate of DNA demethylation.
  • These findings offer a molecular basis for observed global hypomethylation patterns in development.