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The Origin Recognition Complex (ORC) uses a specific protein motif in yeast, but not humans, to select DNA replication origins. Removing this motif from yeast ORC makes its DNA binding more flexible, similar to human ORC.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The Origin Recognition Complex (ORC) is crucial for eukaryotic DNA replication.
  • ORC's origin selection mechanism differs significantly between species like yeast and humans.
  • These differences are adaptations to distinct life cycles and cellular environments.

Purpose of the Study:

  • To identify the specific structural feature responsible for divergent ORC DNA binding selectivity.
  • To investigate how altering this feature impacts yeast ORC's origin recognition properties.
  • To compare the modified yeast ORC's behavior to that of human ORC.

Main Methods:

  • Comparative structural analysis of yeast and human ORC.
  • Site-directed mutagenesis to remove a specific motif from the yeast Orc4 subunit.
  • DNA binding assays to assess origin selection by wild-type and mutant yeast ORC.
  • Analysis of ORC binding near transcriptional start sites (TSSs).

Main Results:

  • A 19-amino acid insertion helix in the yeast Orc4 subunit determines its DNA binding specificity.
  • Removal of this motif from yeast Orc4 renders ORC's selectivity dependent on chromatin landscape, mimicking human ORC.
  • The modified yeast ORC gains affinity for regions near TSSs, a characteristic shared with human ORC.

Conclusions:

  • The Orc4 subunit's 19-amino acid insertion is a key determinant of species-specific ORC origin selection.
  • Modulating this motif can switch yeast ORC from site-specific to chromatin-dependent replication origin selection.
  • This finding provides insights into the evolution of DNA replication control and its adaptation to different organisms.