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The yeast mitotic cyclin Clb2 cannot substitute for S phase cyclins in replication origin firing

机译:酵母有丝分裂细胞周期蛋白Clb2在复制起点激发中不能替代S期细胞周期蛋白

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摘要

Cyclin-dependent kinases (CDKs) drive the cell cycle, central to which is the accurate control of chromosome replication. In Saccharomyces cerevisiae, six closely related B-type cyclins (Clb1–6) drive the events of S phase and mitosis. Either Clb5 or Clb6 can activate early-firing replication origins, whereas only Clb5 can activate late origins. Clb1–4 are expressed later in the cell cycle. Whether Clb cyclins differ only in timing of expression, or else impart different kinase specificities is under ongoing investigation. This study shows that the expression of Clb2 during S phase in cells lacking Clb5 failed to rescue late origin activation. Early expression of Clb2 in cells lacking both Clb5 and Clb6 did not activate early origins on schedule to restore the correct S phase entry time. Therefore, Clb2 cannot drive timely activation of either early or late replication origins, demonstrating that Clb2-directed CDK has a specificity distinct from that driven by Clb5 and Clb6.
机译:细胞周期蛋白依赖性激酶(CDK)驱动细胞周期,其关键是染色体复制的精确控制。在酿酒酵母中,六个密切相关的B型细胞周期蛋白(Clb1-6)驱动S期和有丝分裂事件。 Clb5或Clb6都可以激活早期复制起点,而只有Clb5可以激活晚期复制起点。 Clb1-4在细胞周期的后期表达。 Clb细胞周期蛋白是否仅在表达时机上不同,或赋予不同的激酶特异性,仍在进行中。这项研究表明,缺乏Clb5的细胞在S期表达Clb2未能挽救晚期激活。在缺乏Clb5和Clb6的细胞中Clb2的早期表达不能按计划激活早期起源以恢复正确的S期进入时间。因此,Clb2不能驱动早期或晚期复制起点的及时激活,证明了由Clb2定向的CDK具有不同于由Clb5和Clb6驱动的特异性。

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