RecQ4: the second replicative helicase?

RecQ4: the second replicative helicase?
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DOI:
10.3109/10409231003786086
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发表时间:
2010-06
影响因子:
6.5
通讯作者:
Hsieh TS
Hsieh TS
中科院分区:
生物学2区
文献类型:
--
作者:
Capp C;Wu J;Hsieh TS

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近年来的工作对了解RecQ4的生物学和生物化学有很大的贡献。它通过其Sld2同源结构域在CMG复合物的形成和复制起始中起着重要的非酶作用。RecQ4的解旋酶结构域现在已经被证明具有3'-5' DNA解旋酶活性,就像RecQ家族的其他成员一样。这种活性的生物学目的尚不清楚,但在没有野生型RecQ4的情况下,解旋酶死亡突变体无法恢复活力。这表明RecQ4发挥着第二种作用,它需要解旋酶活性,并与复制和DNA修复有关。因此,很明显,RecQ4和Mcm2-7这两种解旋酶对复制是不可或缺的。这两种解旋酶同时参与的性质仍有待确定,可能的模型将被提出。
Recent work has greatly contributed to the understanding of the biology and biochemistry of RecQ4. It plays an essential non-enzymatic role in the formation of the CMG complex, and thus replication initiation, by means of its Sld2 homologous domain. The helicase domain of RecQ4 has now been demonstrated to possess 3'-5' DNA helicase activity, like the other members of the RecQ family. The biological purpose of this activity is still unclear, but helicase-dead mutants are unable to restore viability in the absence of wildtype RecQ4. This indicates that RecQ4 performs a second role, which requires helicase activity and is implicated in replication and DNA repair. Thus, it is clear that two helicases, RecQ4 and Mcm2-7, are integral to replication. The nature of the simultaneous involvement of these two helicases remains to be determined, and possible models will be proposed.
DOI: 10.1074/jbc.m109.008052
发表时间: 2009-11-06
影响因子: 4.8
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