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Molecular and Cellular Biology, December 1998, p. 7294-7303, Vol. 18, No. 12
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Multiple Orientation-Dependent, Synergistically Interacting, Similar Domains in the Ribosomal DNA Replication Origin of the Fission Yeast, Schizosaccharomyces pombe

Soo-Mi Kim and Joel A. Huberman*

Department of Genetics, Roswell Park Cancer Institute, Buffalo, New York 14263

Received 3 June 1998/Returned for modification 3 August 1998/Accepted 19 August 1998

Previous investigations have shown that the fission yeast, Schizosaccharomyces pombe, has DNA replication origins (500 to 1500 bp) that are larger than those in the budding yeast, Saccharomyces cerevisiae (100 to 150 bp). Deletion and linker substitution analyses of two fission yeast origins revealed that they contain multiple important regions with AT-rich asymmetric (abundant A residues in one strand and T residues in the complementary strand) sequence motifs. In this work we present the characterization of a third fission yeast replication origin, ars3001, which is relatively small (~570 bp) and responsible for replication of ribosomal DNA. Like previously studied fission yeast origins, ars3001 contains multiple important regions. The three most important of these regions resemble each other in several ways: each region is essential for origin function and is at least partially orientation dependent, each region contains similar clusters of A+T-rich asymmetric sequences, and the regions can partially substitute for each other. These observations suggest that ars3001 function requires synergistic interactions between domains binding similar proteins. It is likely that this requirement extends to other fission yeast origins, explaining why such origins are larger than those of budding yeast.

* Corresponding author. Mailing address: Department of Genetics, Roswell Park Cancer Institute, Elm & Carlton Streets, Buffalo, NY 14263-0001. Phone: (716) 845-3047. Fax: (716) 845-8126. E-mail: huberman{at}acsu.buffalo.edu.

Molecular and Cellular Biology, December 1998, p. 7294-7303, Vol. 18, No. 12
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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