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.
中科院分区:
文献类型:
--
作者:
Canzio, Daniele;Larson, Adam;Narlikar, Geeta J.
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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