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Base eversion and shuffling by DNA methyltransferases

H C Nelson1, T H Bestor

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.

Chemistry & Biology
|June 1, 1996
PubMed
Summary
This summary is machine-generated.

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DNA cytosine methyltransferases use novel eversion mechanisms to access cytosine. These processes involve DNA bending, and one includes significant base shuffling and distortion.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • DNA cytosine methyltransferases (DNMTs) are crucial enzymes for epigenetic regulation.
  • Understanding DNMT mechanisms is key to deciphering gene expression control.

Purpose of the Study:

  • To elucidate the structural mechanisms by which DNA cytosine methyltransferases access their target cytosine residue.
  • To identify novel pathways for substrate recognition and binding.

Main Methods:

  • X-ray crystallography was used to determine the structures of two distinct DNA cytosine methyltransferases.
  • Structural analysis focused on enzyme-substrate interactions and DNA conformation.

Main Results:

  • Two novel mechanisms for cytosine access were revealed, both involving cytosine eversion.

Related Experiment Videos

  • One mechanism involves significant DNA bending and base shuffling, leading to DNA distortion.
  • The other mechanism also utilizes cytosine eversion, potentially with less DNA disruption.

    • Conclusions:

    • Cytosine eversion is a common strategy employed by DNA cytosine methyltransferases for accessing the target base.
    • Enzyme-induced DNA bending and distortion play critical roles in facilitating substrate access.
    • These findings provide new insights into the dynamic nature of DNA-enzyme interactions in epigenetic modifications.