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Overexpression and purification of bacterial topoisomerase IV.

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Related Experiment Video

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Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
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The structure of supercoiled intermediates in DNA replication

B J Peter1, C Ullsperger, H Hiasa

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

Cell
|September 30, 1998
PubMed
Summary

DNA replication intermediates exhibit superhelical stress throughout the molecule, not just in the unreplicated portion. This finding clarifies how topoisomerases function during DNA replication in both prokaryotes and eukaryotes.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Plasmid DNA replication involves complex structural changes.
  • Replication termination sites are crucial for controlling DNA synthesis.
  • Topoisomerases play a vital role in managing DNA topology during replication.

Purpose of the Study:

  • To investigate the structural organization of DNA replication intermediates.
  • To understand the distribution of superhelical stress in partially replicated DNA molecules.
  • To elucidate the mechanism of topoisomerase action during replication termination.

Main Methods:

  • Tus-induced arrest of plasmid DNA replication.
  • In vitro studies using purified replication components.
  • In vivo analysis of replication intermediates.

Main Results:

  • Superhelical stress is distributed throughout partially replicated DNA molecules, including daughter segments.
  • Daughter DNA segments become intertwined.
  • The unreplicated DNA region remains supercoiled.
  • Topoisomerases can act both ahead of and behind the replication fork.

Conclusions:

  • The distribution of superhelical stress is more complex than previously thought.
  • This study reconciles previous observations of supercoiling in different replication intermediate studies.
  • The findings provide a comprehensive understanding of DNA topology management during replication.