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Related Experiment Videos

Conserved initiator proteins in eukaryotes

K A Gavin1, M Hidaka, B Stillman

  • 1Cold Spring Harbor Laboratory, NY 11724, USA.

Science (New York, N.Y.)
|December 8, 1995
PubMed
Summary
This summary is machine-generated.

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The origin recognition complex (ORC) is crucial for DNA replication initiation in eukaryotes. Studies show its subunits are conserved across species, indicating a fundamental role in cell division.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The origin recognition complex (ORC) is a key protein complex in Saccharomyces cerevisiae, essential for initiating DNA replication.
  • ORC binds to chromosomal replicators, playing a vital role in the cell cycle.

Purpose of the Study:

  • To investigate the conservation of ORC subunits across diverse eukaryotic organisms.
  • To explore the functional significance of ORC in DNA replication and cell viability.

Main Methods:

  • Cloning complementary DNAs (cDNAs) encoding ORC-related proteins from various eukaryotes, including yeast (Kluyveromyces lactis, Schizosaccharomyces pombe), humans, and plants (Arabidopsis thaliana).
  • Utilizing genetic analysis of the orc1+ gene in S. pombe.
  • Performing in vivo interaction studies of human ORC-related proteins.

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Main Results:

  • cDNAs encoding proteins homologous to S. cerevisiae Orc1p and Orc2p were successfully cloned from multiple eukaryotic species.
  • Orc1p homolog from S. pombe (orc1+) was found to be essential for cell viability.
  • Human ORC-related proteins were shown to interact in vivo, forming a complex.

Conclusions:

  • ORC subunits are highly conserved throughout eukaryotic evolution.
  • The function of ORC in DNA replication initiation is a fundamental process conserved in all eukaryotes.
  • These findings highlight the universal importance of ORC in eukaryotic DNA replication.