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Role of poly(A) tail length in Alu retrotransposition.

机译:poly(A)尾长在Alu逆转座中的作用。

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摘要

Alu are mobile noncoding Short INterspersed Elements (SINEs) present at a million copies in the human genome. Using marked Alu sequences in an ex vivo assay, we previously showed that they are mobilized through diversion of the LINE (Long INterspersed Elements) retrotransposition machinery, with the poly(A) tail of the Alu being required for their mobility. Here we show that other homopolymeric tracts cannot functionally replace the Alu poly(A) tail, and that the Alu transposition rate varies over a two-log range depending on the poly(A) tail length. Variation is according to a sigmoid-shaped curve with a lag observed for tails shorter than 15 nt and a plateau reached for tails longer than 50 nt, consistent with the binding of a limited number of a protein component requiring multiple contacts for a productive interaction with the poly(A) stretch. This analysis indicates that most of the naturally occurring genomic Alu, owing to their pA tail length, should be poor substrates for the LINE machinery, a feature possibly "selected" for the host sake.
机译:Alu是存在于人类基因组中的百万个拷贝的移动非编码短插入元素(SINE)。在离体测定中使用标记的Alu序列,我们以前表明它们是通过转移LINE(长插入元素)逆转座子机器而动员的,而其移动性则需要Alu的poly(A)尾巴。在这里,我们显示了其他均聚物束无法在功能上替代Alu poly(A)尾部,并且根据poly(A)尾部长度,Alu换位速率在两个对数范围内变化。根据乙状曲线变化,对于小于15 nt的尾巴观察到滞后,而对于大于50 nt的尾巴则达到平稳,这与有限数量的蛋白质成分的结合相一致,该蛋白质成分需要多次接触才能与蛋白产生相互作用。 poly(A)拉伸。该分析表明,由于它们的pA尾长,大多数天然存在的基因组Alu对于LINE机械来说应该是较差的底物,为宿主着想,可能会“选择”此功能。

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