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Role of p38 in Replication of Trypanosoma brucei Kinetoplast DNA

机译:p38在布鲁氏锥虫肌动蛋白DNA复制中的作用

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Trypanosomes have an unusual mitochondrial genome, called kinetoplast DNA, that is a giant network containing thousands of interlocked minicircles. During kinetoplast DNA synthesis, minicircles are released from the network for replication as θ-structures, and then the free minicircle progeny reattach to the network. We report that a mitochondrial protein, which we term p38, functions in kinetoplast DNA replication. RNA interference (RNAi) of p38 resulted in loss of kinetoplast DNA and accumulation of a novel free minicircle species named fraction S. Fraction S minicircles are so underwound that on isolation they become highly negatively supertwisted and develop a region of Z-DNA. p38 binds to minicircle sequences within the replication origin. We conclude that cells with RNAi-induced loss of p38 cannot initiate minicircle replication, although they can extensively unwind free minicircles.
机译:锥虫有一个不寻常的线粒体基因组,称为动质体DNA,是一个包含数千个互锁的小圆圈的巨大网络。在动子体DNA合成过程中,小环从网络中释放出来,以θ结构复制,然后自由小环后代重新附着到网络上。我们报告说,线粒体蛋白,我们称为p38,在动塑料DNA复制中起作用。 p38的RNA干扰(RNAi)导致动子体DNA丢失,并积累了一种称为小数S的新型自由小圆物种。小数S小圆被如此缠绕,以致于它们在分离时会高度负超扭曲,并形成一个Z-DNA区域。 p38与复制起点内的小环序列结合。我们得出结论,具有RNAi诱导的p38缺失的细胞不能启动小环复制,尽管它们可以大量释放游离的小环。

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