SCH9, a putative protein kinase from Saccharomyces cerevisiae, affects HOT1-stimulated recombination.

SCH9, a putative protein kinase from Saccharomyces cerevisiae, affects HOT1-stimulated recombination.
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SCH9 是一种来自酿酒酵母的推定蛋白激酶,影响 HOT1 刺激的重组。

DOI:
10.1007/s00438-004-1049-x
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发表时间:
2004
期刊:
Molecular genetics and genomics : MGG
影响因子:
--
通讯作者:
Keil,RL
Keil,RL
中科院分区:
--
文献类型:
--
作者:
Prusty,R;Keil,RL

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hot1是源自酵母rDNA的有丝分裂重组热点。为了进一步研究hot1的功能,分离出改变热点活性的trans- actiinghot1recombinationmutants (hrm)。hrm2-1突变体的hot1活性降低,生长缓慢。hrm2基因被克隆并发现与sch9基因相同,sch9基因影响生长控制机制,该机制与camp依赖性蛋白激酶a (PKA)途径部分冗余。sch9缺失和rDNA重组,而非其他有丝分裂交换。虽然高水平的RNA聚合酶I转录启动了hot1的重组刺激活性,sch9突变不影响在hot1启动的转录。因此,转录是hot1活性的必要条件,但不是充分条件。编码PKA催化亚基的TPK1是sch9突变体重组和生长缺陷的多拷贝抑制因子,这表明PKA活性的增加补偿了sch9的损失。编码高活性veras蛋白并增加PKA活性的RAS2val19抑制了sch9突变体的两种表型缺陷。相比之下,多拷贝载体上的分裂锌指蛋白1(SFP1)基因仅抑制sch9突变体的生长缺陷,表明Sch9p的生长和hot1功能是可分离的。Sch9p可能影响调节hot1刺激交换特异性所需蛋白质的信号转导途径。
HOT1is a mitotic recombination hotspot derived from yeast rDNA. To further studyHOT1function,trans-actingHOT1recombinationmutants (hrm) that alter hotspot activity were isolated.hrm2-1mutants have decreasedHOT1activity and grow slowly. TheHRM2gene was cloned and found to be identical toSCH9, a gene that affects a growth-control mechanism that is partially redundant with the cAMP-dependentproteinkinaseA(PKA) pathway. Deletion ofSCH9decreasesHOT1and rDNA recombination but not other mitotic exchange. Although high levels of RNA polymerase I transcription initiated atHOT1are required for its recombination-stimulating activity,sch9mutations do not affect transcription initiated withinHOT1. Thus, transcription is necessary but not sufficient forHOT1activity.TPK1, which encodes a catalytic subunit of PKA, is a multicopy suppressor of the recombination and growth defects ofsch9mutants, suggesting that increased PKA activity compensates forSCH9loss.RAS2val19, which codes for a hyperactiveRASprotein and increases PKA activity, suppresses both phenotypic defects ofsch9mutants. In contrast toTPK1andRAS2val19, the gene forsplit zincfingerprotein1(SFP1) on a multicopy vector suppresses only the growth defects ofsch9mutants, indicating that growth andHOT1functions of Sch9p are separable. Sch9p may affect signal transduction pathways which regulate proteins that are specifically required forHOT1-stimulated exchange.
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