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Related Experiment Videos

The origin recognition complex interacts with a bipartite DNA binding site within yeast replicators

H Rao1, B Stillman

  • 1Cold Spring Harbor Laboratory, NY 11724.

Proceedings of the National Academy of Sciences of the United States of America
|March 14, 1995
PubMed
Summary

The origin recognition complex (ORC) binds to DNA replication origins, requiring ATP and the A element. New findings show the B1 element is also crucial for ORC binding and DNA replication initiation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Replicators are chromosomal elements defining DNA replication origins.
  • The ARS1 replicator in Saccharomyces cerevisiae has essential A and B elements (B1, B2, B3).
  • The A element binds origin recognition complex (ORC); B3 binds Abf1p; B1 and B2 functions are unknown.

Purpose of the Study:

  • To investigate the interaction between replicators and the origin recognition complex (ORC).
  • To define the functional role of the B1 element in DNA replication initiation.

Main Methods:

  • Gel-based DNA binding assays were used to study ORC-DNA interactions.
  • DNase I footprinting was employed to analyze ORC binding sites.
  • Mutational analysis of the B1 element was performed.

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Main Results:

  • ORC-DNA interaction requires ATP and the A element, with the B1 element also being important.
  • ORC binds to a bipartite recognition element within the DNA, involving A and B1 elements.
  • Mutations in the B1 element suggest additional roles in DNA replication initiation beyond ORC binding.

Conclusions:

  • The B1 element is essential for ORC binding to DNA replication origins.
  • The B1 element plays a critical role in the initiation of DNA replication in Saccharomyces cerevisiae.
  • ORC recognizes a bipartite DNA element comprising the A and B1 elements.