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Molecular and Cellular Biology, April 2001, p. 2790-2801, Vol. 21, No. 8
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.8.2790-2801.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Two Compound Replication Origins in Saccharomyces cerevisiae Contain Redundant Origin Recognition Complex Binding Sites

James F. Theis and Carol S. Newlon*

Department of Microbiology and Molecular Genetics, UMDNJ-New Jersey Medical School, Newark, New Jersey 07103

Received 19 October 2000/Returned for modification 4 December 2000/Accepted 25 January 2001

While many of the proteins involved in the initiation of DNA replication are conserved between yeasts and metazoans, the structure of the replication origins themselves has appeared to be different. As typified by ARS1, replication origins in Saccharomyces cerevisiae are <150 bp long and have a simple modular structure, consisting of a single binding site for the origin recognition complex, the replication initiator protein, and one or more accessory sequences. DNA replication initiates from a discrete site. While the important sequences are currently less well defined, metazoan origins appear to be different. These origins are large and appear to be composed of multiple, redundant elements, and replication initiates throughout zones as large as 55 kb. In this report, we characterize two S. cerevisiae replication origins, ARS101 and ARS310, which differ from the paradigm. These origins contain multiple, redundant binding sites for the origin recognition complex. Each binding site must be altered to abolish origin function, while the alteration of a single binding site is sufficient to inactivate ARS1. This redundant structure may be similar to that seen in metazoan origins.

* Corresponding author. Mailing address: Department of Microbiology and Molecular Genetics, UMDNJ-New Jersey Medical School, 185 South Orange Ave., Newark, NJ 07103. Phone: (973) 972-4227. Fax: (973) 972-3644. E-mail: newlon{at}umdnj.edu.

Molecular and Cellular Biology, April 2001, p. 2790-2801, Vol. 21, No. 8
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.8.2790-2801.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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