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DNA modification by methyltransferases

X Cheng1

  • 1WM Keck Structural Biology Laboratory, Cold Spring Harbor Laboratory, New York 11724, USA.

Current Opinion in Structural Biology
|February 1, 1995
PubMed
Summary
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DNA methylation is crucial in all life. Structural studies of HhaI methyltransferase show cytosine flipping and a unique DNA-binding motif, suggesting a universal catalytic domain in S-adenosyl-L-methionine-dependent methyltransferases.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Enzymatic DNA methylation is vital in prokaryotic and eukaryotic organisms.
  • C5-cytosine methylation is a key epigenetic modification.
  • Understanding DNA methyltransferases provides insight into gene regulation.

Purpose of the Study:

  • To elucidate the structural mechanisms of HhaI DNA methyltransferase.
  • To investigate the chemistry of C5-cytosine methylation.
  • To compare structural features across different methyltransferases.

Main Methods:

  • X-ray crystallography of the HhaI DNA methyltransferase-DNA complex.
  • Structural analysis and comparison of HhaI with other methyltransferases (TaqI, catechol O-methyltransferase).

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Main Results:

  • The HhaI-DNA complex revealed a substrate cytosine flipped out of the DNA double helix.
  • A novel two-loop DNA-binding motif was identified for sequence recognition and base flipping.
  • Structural similarities suggest a conserved catalytic domain among S-adenosyl-L-methionine-dependent methyltransferases.

Conclusions:

  • HhaI methyltransferase employs a unique mechanism involving base flipping.
  • The identified DNA-binding motif is key to HhaI's function.
  • A common catalytic domain structure may be conserved across S-adenosyl-L-methionine-dependent methyltransferases.