Chromosomal ARS1 has a single leading strand start site

被引：97

作者：

Bielinsky, AK ^{[1
]}

Gerbi, SA ^{[1
]}

机构：

[1] Brown Univ, Div Biol & Med, Providence, RI 02912 USA

来源：

MOLECULAR CELL | 1999年 / 3卷 / 04期

关键词：

D O I：

10.1016/S1097-2765(00)80475-X

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Initiation sites for DNA synthesis in the chromosomal autonomously replicating sequence (ARS)1 of Saccharomyces cerevisiae were detected at the nucleotide level. The transition from discontinuous to continuous synthesis defines the origin of bidirectional replication (OBR), which mapped adjacent to the origin recognition complex binding site. To ascertain which sites represented starts for leading or lagging strands, we characterized DNA replication from ARS1 in a cdcs (DNA ligase I) mutant, defective for joining Okazaki fragments. Leading strand synthesis in ARS1 initiated at only a single site, the OBR. Thus, replication in S. cerevisiae is not initiated stochastically by choosing one out of multiple possible sites but, rather, is a highly regulated process with one precise start point.

引用

页码：477 / 486

页数：10

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