Origin recognition complex binding to a metazoan replication origin |
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Authors: | Bielinsky A K Blitzblau H Beall E L Ezrokhi M Smith H S Botchan M R Gerbi S A |
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Institution: | Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI 02912, USA. |
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Abstract: | The initiation of DNA replication in eukaryotic cells at the onset of S phase requires the origin recognition complex (ORC) 1]. This six-subunit complex, first isolated in Saccharomyces cerevisiae 2], is evolutionarily conserved 1]. ORC participates in the formation of the prereplicative complex 3], which is necessary to establish replication competence. The ORC-DNA interaction is well established for autonomously replicating sequence (ARS) elements in yeast in which the ARS consensus sequence 4] (ACS) constitutes part of the ORC binding site 2, 5]. Little is known about the ORC-DNA interaction in metazoa. For the Drosophila chorion locus, it has been suggested that ORC binding is dispersed 6]. We have analyzed the amplification origin (ori) II/9A of the fly, Sciara coprophila. We identified a distinct 80-base pair (bp) ORC binding site and mapped the replication start site located adjacent to it. The binding of ORC to this 80-bp core region is ATP dependent and is necessary to establish further interaction with an additional 65-bp of DNA. This is the first time that both the ORC binding site and the replication start site have been identified in a metazoan amplification origin. Thus, our findings extend the paradigm from yeast ARS1 to multicellular eukaryotes, implicating ORC as a determinant of the position of replication initiation. |
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