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Structure of the origin recognition complex bound to DNA replication origin.

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The origin recognition complex (ORC) binds DNA to initiate replication. This study reveals how ORC structures DNA at replication origins, aiding in DNA replication initiation and helicase loading in eukaryotes.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • The origin recognition complex (ORC) is essential for initiating DNA replication in eukaryotes.
  • ORC identifies and binds to specific DNA sequences known as origins of replication.
  • Understanding ORC's interaction with DNA is crucial for comprehending replication control.

Purpose of the Study:

  • To determine the high-resolution structure of the Saccharomyces cerevisiae ORC bound to origin DNA.
  • To elucidate the molecular mechanisms by which ORC recognizes and binds to replication origins.
  • To investigate how ORC modulates DNA structure to facilitate replication initiation.

Main Methods:

  • Three-angstrom cryo-electron microscopy (cryo-EM) was used to visualize the ORC-DNA complex.
  • The study focused on the Saccharomyces cerevisiae ORC bound to a 72-base-pair origin DNA sequence.
  • Structural analysis identified specific protein-DNA interactions and DNA bending events.

Main Results:

  • The six-subunit ORC encircles the DNA, interacting extensively with the phosphate backbone and bases.
  • ORC induces significant DNA bending at the ARS consensus sequence (ACS) and B1 element.
  • Specific thymine recognition involves conserved motifs in Orc1 (minor groove) and species-specific motifs in Orc4 (major groove).
  • Orc2 and Orc5 utilize insertion motifs to interact with DNA bases and bend DNA at the B1 site.

Conclusions:

  • ORC plays a conserved role in modulating DNA structure at replication origins.
  • These structural changes are critical for accurate origin selection and subsequent helicase loading.
  • The findings provide atomic-level insights into the fundamental process of eukaryotic DNA replication initiation.