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CONTROL OF TELOMERE GROWTH BY INTERACTIONS OF RAP1 WITH THE MOST DISTAL TELOMERIC REPEATS

机译:RAP1与大部分远端端粒重复序列的相互作用控制端粒生长

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TELOMERES, the specialized DNA-protein structures at the ends of eukaryotic chromosomes, are required for chromosomal stability and integrity(1-3). Regulation of the overall length of the telomeric DNA repeat tract is likely to be a key requirement for its various biological roles. We have studied telomere length regulation in the yeast Kluyveromyces lactis, which has long (25 base pairs) homogeneous telomeric repeat units(4) that make it highly suitable for telomere studies. In the related Saccharomyces cerevisiae, the DNA-sequence-specific duplex-binding protein RAP1 is a component of the telomeric complex(5-9). Here we show that the phenotypic severity of previously described telomerase RNA (ter1) mutations(10) is directly proportional to the loss of RAP1 binding to mutated telomeric repeats. Using a carboxy-terminal-tail mutant of K. lactis RAP1, we also show that, unexpectedly, RAP1 interaction with the most terminal telomeric repeats is crucial for telomere length control. [References: 19]
机译:TELOMERES是真核染色体末端的特殊DNA-蛋白质结构,是染色体稳定性和完整性所必需的(1-3)。调节端粒DNA重复序列的总长度可能是对其各种生物学作用的关键要求。我们已经研究了乳酸克鲁维酵母(Kluyveromyces lactis)中的端粒长度调节,该酵母具有长(25个碱基对)均质的端粒重复单元(4),非常适合端粒研究。在相关的酿酒酵母中,DNA序列特异性双链结合蛋白RAP1是端粒复合物的组成部分(5-9)。在这里,我们显示了先前描述的端粒酶RNA(ter1)突变(10)的表型严重性与RAP1与突变的端粒重复序列结合的损失成正比。使用乳酸克鲁维酵母RAP1的羧基末端尾突变,我们还表明,出乎意料的是,RAP1与最末端的端粒重复序列的相互作用对于端粒长度控制至关重要。 [参考:19]

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