The inner nuclear membrane protein Src1 associates with subtelomeric genes and alters their regulated gene expression.

The inner nuclear membrane protein Src1 associates with subtelomeric genes and alters their regulated gene expression.
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内部核膜蛋白SRC1与亚电体基因相关,并改变其调控基因表达。

DOI:
10.1083/jcb.200803098
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发表时间:
2008-09-08
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Hurt E
Hurt E
中科院分区:
其他
文献类型:
--
作者:
Grund SE;Fischer T;Cabal GG;Antúnez O;Pérez-Ortín JE;Hurt E

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含有LEM (LAP2, emerin和MAN1)结构域的核膜蛋白参与不同的过程,包括染色质组织,基因表达和核膜生物发生。在这项研究中,我们发现转录输出(TREX)因子和酵母Src1(一种完整的核膜蛋白,与脊椎动物LEM2同源)之间存在强大的遗传相互作用。DNA宏阵列分析显示,磷酸盐调控基因PHO11、PHO12和PHO84在src1Δ细胞中表达上调。值得注意的是,这些PHO基因位于染色质的亚端粒区域,并在体内表现出核周位置。Src1跨越核膜两次,并将其N和C结构域与假定的dna结合基序暴露给核质。全基因组染色质免疫沉淀芯片分析表明,Src1在酵母染色体的端粒和亚端粒区域高度富集。我们的数据表明,核膜蛋白Src1在亚端粒基因表达和trex依赖性信使RNA通过核孔复合物输出之间的界面上起作用。
Inner nuclear membrane proteins containing a LEM (LAP2, emerin, and MAN1) domain participate in different processes, including chromatin organization, gene expression, and nuclear envelope biogenesis. In this study, we identify a robust genetic interaction between transcription export (TREX) factors and yeast Src1, an integral inner nuclear membrane protein that is homologous to vertebrate LEM2. DNA macroarray analysis revealed that the expression of the phosphate-regulated genes PHO11, PHO12, and PHO84 is up-regulated in src1Δ cells. Notably, these PHO genes are located in subtelomeric regions of chromatin and exhibit a perinuclear location in vivo. Src1 spans the nuclear membrane twice and exposes its N and C domains with putative DNA-binding motifs to the nucleoplasm. Genome-wide chromatin immunoprecipitation–on-chip analyses indicated that Src1 is highly enriched at telomeres and subtelomeric regions of the yeast chromosomes. Our data show that the inner nuclear membrane protein Src1 functions at the interface between subtelomeric gene expression and TREX-dependent messenger RNA export through the nuclear pore complexes.
Rap1和拓扑异构酶II在酵母的核和减数分裂染色体中的定位。
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