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Assembly of the human origin recognition complex.

S Vashee1, P Simancek, M D Challberg

  • 1Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.

The Journal of Biological Chemistry
|April 27, 2001
PubMed
Summary
This summary is machine-generated.

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Human origin recognition complex (ORC) assembly was investigated, revealing a core of subunits HsOrc2-HsOrc4. This core facilitates the ordered assembly of HsOrc5 and HsOrc1, crucial for DNA replication initiation.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The origin recognition complex (ORC) is essential for DNA replication initiation in eukaryotes.
  • While yeast ORC is well-characterized, the biochemical properties of human ORC (HsORC) remain largely unknown.
  • Human homologues of all six ORC subunits have been identified, but their assembly and interactions are not fully understood.

Purpose of the Study:

  • To characterize the subunit composition and assembly of human ORC (HsORC).
  • To elucidate the subunit-subunit interactions governing HsORC complex formation.
  • To identify the core subunits and assembly pathway of HsORC.

Main Methods:

  • Extraction of endogenous HsORC from HeLa cell chromatin.
  • Immunoprecipitation using specific antibodies to probe subunit composition.

Related Experiment Videos

  • Expression of recombinant HsORC subunits in insect cells using the baculovirus system.
  • Co-immunoprecipitation experiments to analyze subunit interactions.

    • Main Results:

    • Endogenous HsORC contained homologues of Orc1-Orc5 but lacked Orc6.
    • Recombinant expression identified a six-subunit HsORC complex.
    • Key binary interactions identified: HsOrc2-HsOrc3, HsOrc2-HsOrc4, HsOrc3-HsOrc4, HsOrc2-HsOrc6, HsOrc3-HsOrc6.
    • HsOrc5 and HsOrc1 assembled onto a core complex of HsOrc2, HsOrc3, and HsOrc4.

    Conclusions:

    • HsOrc2, HsOrc3, and HsOrc4 form a stable core structure for HsORC assembly.
    • An ordered assembly pathway exists for HsORC, with HsOrc5 and HsOrc1 joining the core.
    • This characterization provides a foundation for identifying human origins of DNA replication.