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Science 13 March 1998:
Vol. 279. no. 5357, pp. 1733 - 1737
DOI: 10.1126/science.279.5357.1733
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Reports

Roles for ORC in M Phase and S Phase

Andrew Dillin, Jasper Rine *

The origin recognition complex (ORC), a six-subunit protein, functions as the replication initiator in the yeast Saccharomyces cerevisiae. Initiation depends on the assembly of the prereplication complex in late M phase and activation in S phase. One subunit of ORC, Orc5p, was required at G1/S and in early M phase. Asynchronous cells with a temperature-sensitive orc5-1 allele arrested in early M phase. In contrast, cells that were first synchronized in M phase, shifted to the restrictive temperature, and then released from the block arrested at the G1/S boundary. The G1/S arrest phenotype could not be suppressed by introducing wild-type Orc5p during G1. Although all orc2 and orc5 mutations were recessive in the conventional sense, this dominant phenotype was shared with other orc5 alleles and an orc2 allele. The dominant inhibition to cell-cycle progression exhibited by the orc mutants was restricted to the nucleus, suggesting that chromosomes with mutant ORC complexes were capable of sending a signal that blocked initiation on chromosomes containing functional origins.

Division of Genetics, University of California at Berkeley, 401 Barker Hall, Berkeley, CA 94720, USA.
*   To whom correspondence should be addressed. E-mail: jrine{at}uclink4.berkeley.edu

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