Human Pif1 helicase unwinds synthetic DNA structures resembling stalled DNA replication forks.

Human Pif1 helicase unwinds synthetic DNA structures resembling stalled DNA replication forks.
复制标题

DOI:
10.1093/nar/gkp671
复制
发表时间:
2009-10
影响因子:
14.9
通讯作者:
Sanders CM
Sanders CM
中科院分区:
生物学2区
文献类型:
--
作者:
George T;Wen Q;Griffiths R;Ganesh A;Meuth M;Sanders CM

文献摘要

参考文献

被引文献

相似文献

Pif-1蛋白是5′→3′超家族1(SF 1)解旋酶,在酵母中具有维持线粒体和核基因组稳定性的作用。人类酶(hPif 1)的功能和活性尚不清楚,但在这里我们描述了它的DNA结合和DNA重塑活动。我们证明,hPif 1特异性地识别和解旋DNA结构类似于假定的停滞复制叉。值得注意的是,该酶需要复制叉样结构的两个臂来启动此类底物的推定的前导复制链的有效解旋。这种DNA结构特异性的解旋起始模式是保守的核心解旋酶结构域(hPifHD)所固有的,该结构域也具有链退火活性,如已经针对解旋酶的RecQ家族所证明的。hPif 1解旋酶作用于停滞的DNA复制叉的结果将产生游离的3′末端和ssDNA,其可能与其链退火活性一起用于协助复制重启。
Pif-1 proteins are 5′→3′ superfamily 1 (SF1) helicases that in yeast have roles in the maintenance of mitochondrial and nuclear genome stability. The functions and activities of the human enzyme (hPif1) are unclear, but here we describe its DNA binding and DNA remodeling activities. We demonstrate that hPif1 specifically recognizes and unwinds DNA structures resembling putative stalled replication forks. Notably, the enzyme requires both arms of the replication fork-like structure to initiate efficient unwinding of the putative leading replication strand of such substrates. This DNA structure-specific mode of initiation of unwinding is intrinsic to the conserved core helicase domain (hPifHD) that also possesses a strand annealing activity as has been demonstrated for the RecQ family of helicases. The result of hPif1 helicase action at stalled DNA replication forks would generate free 3′ ends and ssDNA that could potentially be used to assist replication restart in conjunction with its strand annealing activity.
DOI: 10.1093/nar/gkl384
发表时间: 2006
影响因子: 14.9
作者:
Castella S;Bingham G;Sanders CM
通讯作者: Sanders CM
人RECQ5BETA解旋酶在合成DNA结构上促进链交换,类似于停滞的复制叉。
DOI: 10.1093/nar/gkl677
发表时间: 2006
影响因子: 14.9
作者:
Kanagaraj, Radhakrishnan;Saydam, Nurten;Garcia, Patrick L.;Zheng, Lu;Janscak, Pavel
通讯作者: Janscak, Pavel
DOI: 10.1038/35003501
发表时间: 2000-03-02
期刊: NATURE
影响因子: 64.8
作者:
Cox, MM;Goodman, MF;Marians, KJ
通讯作者: Marians, KJ
人PIF1解旋酶及其N末端结构域的功能的生化分析。
DOI: 10.1093/nar/gkn609
发表时间: 2008-11
影响因子: 14.9
作者:
Gu, Yongqing;Masuda, Yuji;Kamiya, Kenji
通讯作者: Kamiya, Kenji
DOI: 10.1073/pnas.80.17.5345
发表时间: 1983-01-01
期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES
影响因子: --
作者:
FOURY, F;KOLODYNSKI, J
通讯作者: KOLODYNSKI, J