Translocation of Saccharomyces cerevisiae Pif1 helicase monomers on single-stranded DNA.

Translocation of Saccharomyces cerevisiae Pif1 helicase monomers on single-stranded DNA.
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DOI:
10.1093/nar/gkt117
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发表时间:
2013-04
影响因子:
14.9
通讯作者:
Tomko EJ
Tomko EJ
中科院分区:
生物学2区
文献类型:
--
作者:
Galletto R;Tomko EJ

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在酿酒酵母中,Pif1 参与细胞核和线粒体中的多种 DNA 代谢途径。 Pif1 水解 ATP 和催化双链核酸解旋的能力被认为是其功能的核心。我们最近表明,Pif1 与 DNA 结合后会形成二聚体,并且我们提出 Pif1 二聚体可能是催化 DNA 解旋的物种。在这项工作中,我们证明 Pif1 的单体能够以 5' 至 3' 方向在单链 DNA 上易位。我们提供的证据表明,Pif1 的易位活性可用于解旋以外的活动,可能会取代 ssDNA 中的蛋白质。此外,我们表明,尽管二聚体显然是更好的解旋酶,但 Pif1 的单体保留了一些解旋活性,这表明 Pif1 寡聚状态的调节可能在其作为解旋酶或转位酶的功能中发挥作用。最后,虽然我们证明 Pif1 可以在 ssDNA 上易位,但易位图谱表明 ssDNA 上存在两个 Pif1 群体,两者都能够以 5' 至 3' 方向性易位。
In Saccharomyces cerevisiae Pif1 participates in a wide variety of DNA metabolic pathways both in the nucleus and in mitochondria. The ability of Pif1 to hydrolyse ATP and catalyse unwinding of duplex nucleic acid is proposed to be at the core of its functions. We recently showed that upon binding to DNA Pif1 dimerizes and we proposed that a dimer of Pif1 might be the species poised to catalysed DNA unwinding. In this work we show that monomers of Pif1 are able to translocate on single-stranded DNA with 5′ to 3′ directionality. We provide evidence that the translocation activity of Pif1 could be used in activities other than unwinding, possibly to displace proteins from ssDNA. Moreover, we show that monomers of Pif1 retain some unwinding activity although a dimer is clearly a better helicase, suggesting that regulation of the oligomeric state of Pif1 could play a role in its functioning as a helicase or a translocase. Finally, although we show that Pif1 can translocate on ssDNA, the translocation profiles suggest the presence on ssDNA of two populations of Pif1, both able to translocate with 5′ to 3′ directionality.
DOI: 10.1126/science.286.5437.117
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