ORIGIN RECOGNITION COMPLEX (ORC) IN TRANSCRIPTIONAL SILENCING AND DNA-REPLICATION IN SACCHAROMYCES-CEREVISIAE

被引:294
作者
FOSS, M
MCNALLY, FJ
LAURENSON, P
RINE, J
机构
[1] Division of Genetics, Department of Molecular and Cellular Biology, University of California, Berkeley
[2] Department of Pharmacology, 0450, University of California at San Francisco, San Francisco
关键词
D O I
10.1126/science.8266071
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In Saccharomyces cerevisiae, the HMR-E silencer blocks site-specific interactions between proteins and their recognition sequences in the vicinity of the silencer. Silencer function is correlated with the firing of an origin of replication at HMR-E. An essential gene with a role in transcriptional silencing was identified by means of a screen for mutations affecting expression of HMR. This gene, known as ORC2, was shown to encode a component of the origin recognition complex that binds yeast origins of replication. A temperature-sensitive mutation in ORC2 disrupted silencing in cells grown at the permissive temperature. At the restrictive temperature, the orc2-1 mutation caused cell cycle arrest at a point in the cell cycle indicative of blocks in DNA replication. The orc2-1 mutation also resulted in the enhanced mitotic loss of a plasmid, suggestive of a defect in replication. These results provide strong evidence for an in vivo role of ORC in both chromosomal replication and silencing, and provide a link between the mechanism of silencing and DNA replication.
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页码:1838 / 1844
页数:7
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