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Related Experiment Videos

The complex for replication initiation of Escherichia coli.

W Messer1, H Hartmann-Kühlein, U Langer

  • 1Max-Planck-Institut für molekulare Genetik, Berlin, Federal Republic of Germany.

Chromosoma
|January 1, 1992
PubMed
Summary

Altering the spacing between DnaA boxes in oriC DNA significantly impacts origin function. Specific helical turn changes are required for oriC to remain functional during DNA replication initiation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The oriC region is the origin of replication in bacteria.
  • DnaA protein is essential for initiating DNA replication at oriC.

Purpose of the Study:

  • To investigate the structural requirements of the oriC-DnaA complex.
  • To understand how the spatial arrangement of DnaA binding sites affects origin function.

Main Methods:

  • Site-directed mutagenesis of oriC DNA to alter DnaA box spacing.
  • Assessing origin function through mutant analysis.

Main Results:

  • Base changes in DnaA boxes had minimal impact on oriC function.
  • Mutations altering the distance between DnaA boxes R3 and R4 inactivated oriC unless they involved a full helical turn.

Related Experiment Videos

  • Insertions within the R2-R3 interval were tolerated, but not in the R1-R2 interval.
  • FIS protein was found to bind between DnaA boxes R2 and R3.

    • Conclusions:

    • The precise helical arrangement of DnaA boxes within oriC is critical for DNA replication initiation.
    • A model proposes DnaA monomers arranged with 34 Å spacing, with oriC organized upon this array.