Beyond Tethering and the LEM domain: MSCellaneous functions of the inner nuclear membrane Lem2

Beyond Tethering and the LEM domain: MSCellaneous functions of the inner nuclear membrane Lem2
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超越束缚和 LEM 结构域:MS 内核膜 Lem2 的细胞功能

DOI:
10.1080/19491034.2016.1252892
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发表时间:
2016
期刊:
影响因子:
3.7
通讯作者:
Barrales RR
Barrales RR
中科院分区:
生物学2区
文献类型:
--
作者:
Braun S;Barrales RR

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核被膜在染色质的功能组织中起着关键作用。各种内核膜(INM)蛋白与转录抑制的染色质,这是经常发现在核周边。一个突出的例子是LEM(LAP 2-Emerin-MAN 1)结构域蛋白的保守家族,其与DNA结合蛋白相互作用,并且已经被提出介导染色质与核膜的束缚。我们最近报道,裂殖酵母蛋白Lem 2,同源的后生动物LEM蛋白,有助于核周定位和沉默的异染色质。我们表明,着丝粒染色质的结合和拴系依赖于Lem 2的LEM结构域。出乎意料的是,该结构域被用于异染色质沉默,而异染色质沉默是由Lem 2的不同结构域,MSC(MAN 1-Src 1 C-末端)结构域介导的。因此,Lem 2的沉默和束缚可以在机械上分开。值得注意的是,MSC结构域具有异染色质沉默之外的多种功能。在这里,我们讨论了这些新的研究结果的意义,这种保守的INM蛋白的理解。
The nuclear envelope plays a pivotal role in the functional organization of chromatin. Various inner nuclear membrane (INM) proteins associate with transcriptionally repressed chromatin, which is often found at the nuclear periphery. A prominent example is the conserved family of LEM (LAP2-Emerin-MAN1) domain proteins that interact with DNA-binding proteins and have been proposed to mediate tethering of chromatin to the nuclear membrane. We recently reported that the fission yeast protein Lem2, a homolog of metazoan LEM proteins, contributes to perinuclear localization and silencing of heterochromatin. We demonstrate that binding and tethering of centromeric chromatin depends on the LEM domain of Lem2. Unexpectedly, this domain is dispensable for heterochromatin silencing, which is instead mediated by a different structural domain of Lem2, the MSC (MAN1-Src1 C-terminal) domain. Hence, silencing and tethering by Lem2 can be mechanistically separated. Notably, the MSC domain has multiple functions beyond heterochromatic silencing. Here we discuss the implications of these novel findings for the understanding of this conserved INM protein.
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