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Nucleic Acids Res. Mar 1, 1996; 24(5): 816–823.
PMCID: PMC145715

Multiple DNA elements in ARS305 determine replication origin activity in a yeast chromosome.

Abstract

A yeast autonomously replicating sequence, ARS305, shares essential components with a chromosome III replicator, ORI305. Known components include an ARS consensus sequence (ACS) element, presumed to bind the origin recognition complex (ORC), and a broad 3'-flanking sequence which contains a DNA unwinding element. Here linker substitution mutagenesis of ARS305 and analysis of plasmid mitotic stability identified three short sequence elements within the broad 3'-flanking sequence. The major functional element resides directly 3' of the ACS and the two remaining elements reside further downstream, all within non-conserved ARS sequences. To determine the contribution of the elements to replication origin function in the chromosome, selected linker mutations were transplaced into the ORI305 locus and two-dimensional gel electrophoresis was used to analyze replication bubble formation and fork directions. Mutation of the major functional element identified in the plasmid mitotic stability assay inactivated replication origin function in the chromosome. Mutation of each of the two remaining elements diminished both plasmid ARS and chromosomal origin activities to similar levels. Thus multiple DNA elements identified in the plasmid ARS are determinants of replication origin function in the natural context of the chromosome. Comparison with two other genetically defined chromosomal replicators reveals a conservation of functional elements known to bind ORC, but no two replicators are identical in the arrangement of elements downstream of ORC binding elements or in the extent of functional sequences adjacent to the ACS.

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Selected References

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