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

H. Rao, B. Stillman

Research output: Contribution to journalArticlepeer-review

168 Scopus citations


Replicators are genetically defined elements within chromosomes that determine the location of origins of DNA replication. In the yeast Saccharomyces cerevisiae, the ARS1 replicator contains multiple functional DNA elements: an essential A element and three important B elements-B1, B2, and B3. Functionally similar A, B1, and B2 elements are also present in the ARS307 replicator. The B3 element binds a replication and transcription enhancer protein Abf1p, whereas the A element is required for binding the origin recognition complex (ORC). The function of the B1 and B2 elements remains to be defined. We have used a gel-based DNA binding assay to study the interaction between replicators and the putative initiator protein ORC. In addition to the established requirements for ATP and the A element for ORC-DNA interaction, the new data demonstrate that sequences in the B1 element are also important for ORC-DNA association. This conclusion is supported by DNase I footprint analyses and demonstrates that ORC binds to a bipartitite recognition element within the DNA. Furthermore, mutation of nucleotides in the B1 element suggests that this element has other functions in the initiation of DNA replication besides participating in the ORC-DNA interaction.

Original languageEnglish (US)
Pages (from-to)2224-2228
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number6
StatePublished - Mar 14 1995
Externally publishedYes


  • DNA binding protein
  • DNA replication
  • Saccharomyces cerevisiae
  • initiation

ASJC Scopus subject areas

  • General


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