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Related Experiment Videos

DNA phase transition promoted by replication initiator.

S H Yoshimura1, R L Ohniwa, M H Sato

  • 1Graduate School of Biostudies and Department of Genetics and Molecular Biology, Institute for Virus Research, Kyoto University, Japan. yoshimur@gaia.h.kyoto-u.ac.jp

Biochemistry
|August 5, 2000
PubMed
Summary

Bacterial initiator proteins can relax supercoiled DNA without breaking strands. This DNA relaxation property, observed in RepE54, helps manage superhelical strain during cellular processes like replication.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • DNA supercoiling is crucial for DNA replication, transcription, and recombination.
  • The mechanisms by which superhelical strain is redistributed during these processes remain unclear.
  • DNA/protein interactions are known to influence DNA structure, including bending and wrapping.

Purpose of the Study:

  • To investigate the role of initiator proteins in managing DNA superhelical strain.
  • To elucidate the mechanism by which RepE54 protein induces DNA relaxation.
  • To understand how local DNA strain is redistributed during DNA transactions.

Main Methods:

  • Utilized atomic force microscopy (AFM) for one-molecule imaging.
  • Combined AFM with biochemical procedures.

Related Experiment Videos

  • Studied the interaction of RepE54 protein with negatively supercoiled mini-F plasmid DNA.

    • Main Results:

    • RepE54 binding to mini-F plasmid iterons induces a dynamic transition to a relaxed state.
    • DNA relaxation by RepE54 does not involve DNA strand breaks or local melting.
    • RepE54 does not undergo repeated wrapping by the DNA molecule.

    Conclusions:

    • Initiator proteins possess a novel DNA relaxation property.
    • Local strain from initiator binding can cause a significant conformational shift from supercoiled to relaxed DNA.
    • This mechanism provides insight into superhelical strain management in DNA replication.