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A DNA replication enhancer in Saccharomyces cerevisiae.

S S Walker1, S C Francesconi, S Eisenberg

  • 1Department of Microbiology, School of Medicine, University of Connecticut Health Center, Farmington 06032.

Proceedings of the National Academy of Sciences of the United States of America
|June 1, 1990
PubMed
Summary

Researchers identified key DNA sequences in ARS121 essential for replication origin function. An OBF1 DNA-binding site acts as an enhancer, regulating DNA replication in yeast.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Autonomously replicating sequences (ARS) are crucial for DNA replication initiation in eukaryotes.
  • Understanding the regulatory elements of ARS is vital for comprehending genome stability and cell division.

Purpose of the Study:

  • To dissect the functional domains of the autonomously replicating sequence ARS121.
  • To investigate the role of OBF1 DNA-binding sites in ARS origin function and DNA replication regulation.

Main Methods:

  • Site-directed in vitro mutagenesis was employed to analyze ARS121.
  • Functional assays were performed to assess origin activity after genetic modifications.
  • Synthetic OBF1 DNA-binding sites were engineered and tested for their ability to restore origin function.

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Main Results:

  • Three domains critical for ARS121 origin function were identified.
  • An essential domain contains an 11-bp sequence similar to the ARS core consensus.
  • A synthetic OBF1 DNA-binding site could substitute for a regulatory domain, enhancing origin activity and DNA replication.

Conclusions:

  • The OBF1 DNA-binding site functions as an enhancer of DNA replication.
  • OBF1 and its DNA-binding sites are implicated in regulating the activation of nuclear replication origins in Saccharomyces cerevisiae.