Mechanisms of functional promiscuity by HP1 proteins.

Mechanisms of functional promiscuity by HP1 proteins.
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DOI:
10.1016/j.tcb.2014.01.002
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发表时间:
2014-06
影响因子:
19
通讯作者:
Narlikar, Geeta J.
Narlikar, Geeta J.
中科院分区:
生物学1区
文献类型:
--
作者:
Canzio, Daniele;Larson, Adam;Narlikar, Geeta J.

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异染色质蛋白1(HP1)最初被鉴定为异染色质介导的基因沉默的关键组分,现在被认为在包括基因激活在内的其他几个过程中发挥重要作用。一些真核生物拥有一个以上的HP1基因。尽管高度序列保守性,HP1旁系同源物实现不同的功能。此外,在许多情况下,相同的HP 1蛋白参与多种功能。最近的生化研究揭示了有趣的旁系特异性生物物理差异和意料之外的构象多样性的HP1蛋白,可能占这种功能混杂。在这里,我们回顾了这些发现,并描述了一个分子框架,其目的是连接在体外观察到的HP1蛋白的构象灵活性与其在体内观察到的功能混杂。
Heterochromatin protein 1 (HP1) proteins were originally identified as critical components in heterochromatin mediated gene silencing and are now recognized to play essential roles in several other processes including gene activation. Several eukaryotes possess more than one HP1 paralog. Despite high sequence conservation, the HP1 paralogs achieve diverse functions. Further, in many cases, the same HP1 paralog is implicated in multiple functions. Recent biochemical studies have revealed interesting paralog-specific biophysical differences and unanticipated conformational versatility in HP1 proteins that may account for this functional promiscuity. Here, we review these findings and describe a molecular framework that aims to link the conformational flexibility of HP1 proteins observed in vitro with their functional promiscuity observed in vivo.
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