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. 1994 Jul;14(7):4624–4632. doi: 10.1128/mcb.14.7.4624

Single-stranded-DNA-binding protein-dependent DNA unwinding of the yeast ARS1 region.

K Matsumoto 1, Y Ishimi 1
PMCID: PMC358835  PMID: 8007967

Abstract

DNA unwinding of autonomously replicating sequence 1 (ARS1) from the yeast Saccharomyces cerevisiae was investigated. When a negatively supercoiled plasmid DNA containing ARS1 was digested with single-strand-specific mung bean nuclease, a discrete region in the vector DNA was preferentially digested. The regions containing the core consensus A domain and the 3'-flanking B domain of ARS1 were weakly digested. When the DNA was incubated with the multisubunit single-stranded DNA-binding protein (SSB, also called RPA [replication protein A]) from human and yeast cells prior to mung bean nuclease digestion, the cleavage in the A and B domains was greatly increased. Furthermore, a region corresponding to the 5'-flanking C domain of ARS1 was digested. These results indicate that three domains of ARS1, each of which is important for replication in yeast cells, closely correspond to the regions where the DNA duplex is easily unwound by torsional stress. SSB may stimulate the unwinding of the ARS1 region by its preferential binding to the destabilized three domains. Mung bean nuclease digestion of the substitution mutants with mutations of ARS1 (Y. Marahrens and B. Stillman, Science 255:817-823, 1992) revealed that the sequences in the B2 and A elements are responsible for the unwinding of the B domain and the region containing the A domain, respectively.

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