The yeast Sgs1p helicase acts upstream of Rad53p in the DNA replication checkpoint and colocalizes with Rad53p in S-phase-specific foci.

The yeast Sgs1p helicase acts upstream of Rad53p in the DNA replication checkpoint and colocalizes with Rad53p in S-phase-specific foci.
复制标题

酵母 Sgs1p 解旋酶在 DNA 复制检查点中作用于 Rad53p 的上游,并与 Rad53p 在 S 期特异性焦点中共定位。

DOI:
10.1101/gad.14.1.81
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发表时间:
2000
影响因子:
10.5
通讯作者:
S. Gasser
S. Gasser
中科院分区:
生物学1区
文献类型:
--
作者:
C. Frei;S. Gasser

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我们已经研究了Sgs1p的细胞功能,Sgs1p是一种非必需的酵母DNA解旋酶,其同系物与两种高度衰弱的遗传性人类疾病(沃纳综合征和布卢姆综合征)有关。我们表明,Sgs1p是酵母中S期检查点反应的一个组成部分,它会因DNA损伤或DNA复制过程中的分叉进程受阻而逮捕细胞。DNA聚合酶和Sgs1p被发现在相同的上位性组和行为的上游Rad53 p信号细胞周期停滞时,DNA复制受到干扰。Sgs1p通过细胞周期被严格调控,在S期积累,并与Rad53 p在S期特异性病灶中共定位,即使在没有叉停滞的情况下也是如此。Rad53 p与染色质亚组分的关联是Sgs1p依赖的,这表明解旋酶在监测复制叉进展的信号转导途径中具有重要作用。
We have examined the cellular function of Sgs1p, a nonessential yeast DNA helicase, homologs of which are implicated in two highly debilitating hereditary human diseases (Werner's and Bloom's syndromes). We show that Sgs1p is an integral component of the S-phase checkpoint response in yeast, which arrests cells due to DNA damage or blocked fork progression during DNA replication. DNA polepsilon and Sgs1p are found in the same epistasis group and act upstream of Rad53p to signal cell cycle arrest when DNA replication is perturbed. Sgs1p is tightly regulated through the cell cycle, accumulates in S phase and colocalizes with Rad53p in S-phase-specific foci, even in the absence of fork arrest. The association of Rad53p with a chromatin subfraction is Sgs1p dependent, suggesting an important role for the helicase in the signal-transducing pathway that monitors replication fork progression.
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