Unwinding the functions of the Pif1 family helicases.

Unwinding the functions of the Pif1 family helicases.
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DOI:
10.1016/j.dnarep.2010.01.008
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发表时间:
2010-03-02
期刊:
影响因子:
3.8
通讯作者:
Zakian VA
Zakian VA
中科院分区:
医学3区
文献类型:
--
作者:
Bochman ML;Sabouri N;Zakian VA

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解旋酶是在所有生物体中发现的普遍存在的酶,其对于核酸代谢的所有(或几乎所有)方面是必需的。Pif1解旋酶家族是一组5′→3′定向的、ATP依赖的IB解旋酶超家族,在几乎所有的真核生物中发现。在这里,我们回顾了发现,进化,以及目前已知的这些酶在酿酒酵母(ScPif1和ScRrm3),裂殖酵母(SpPfh1),布氏锥虫(TbPIF1,2,5和8),小鼠(mPif1),和人类(hPif1)。Pif1解旋酶以不同方式影响端粒、核糖体和线粒体DNA复制,以及冈崎片段成熟,并且至少在某些情况下通过利用其解旋酶活性破坏稳定的核蛋白复合物来影响这些过程。虽然这些酶的功能在生物体内和生物体之间各不相同,但很明显,Pif1家族解旋酶对细胞核和线粒体基因组的维持至关重要。
Helicases are ubiquitous enzymes found in all organisms that are necessary for all (or virtually all) aspects of nucleic acid metabolism. The Pif1 helicase family is a group of 5′→3′ directed, ATP-dependent, super-family IB helicases found in nearly all eukaryotes. Here, we review the discovery, evolution, and what is currently known about these enzymes in Saccharomyces cerevisiae (ScPif1 and ScRrm3), Schizosaccharomyces pombe (SpPfh1), Trypanosoma brucei (TbPIF1, 2, 5, and 8), mice (mPif1), and humans (hPif1). Pif1 helicases variously affect telomeric, ribosomal, and mitochondrial DNA replication, as well as Okazaki fragment maturation, and in at least some cases affect these processes by using their helicase activity to disrupt stable nucleoprotein complexes. While the functions of these enzymes vary within and between organisms, it is evident that Pif1 family helicases are crucial for both nuclear and mitochondrial genome maintenance.
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