DNA 拉链码与核孔复合体的相互作用促进 H2A.Z 的掺入和 INO1 的转录记忆。

Interaction of a DNA zip code with the nuclear pore complex promotes H2A.Z incorporation and INO1 transcriptional memory.

机构信息

Department of Molecular Biosciences, Northwestern University, Evanston, IL 60208, USA.

出版信息

Mol Cell. 2010 Oct 8;40(1):112-25. doi: 10.1016/j.molcel.2010.09.007.

Abstract

DNA "zip codes" in the promoters of yeast genes confer interaction with the NPC and localization at the nuclear periphery upon activation. Some of these genes exhibit transcriptional memory: after being repressed, they remain at the nuclear periphery for several generations, primed for reactivation. Transcriptional memory requires the histone variant H2A.Z. We find that targeting of active INO1 and recently repressed INO1 to the nuclear periphery is controlled by two distinct and independent mechanisms involving different zip codes and different interactions with the NPC. An 11 base pair memory recruitment sequence (MRS) in the INO1 promoter controls both peripheral targeting and H2A.Z incorporation after repression. In cells lacking either the MRS or the NPC protein Nup100, INO1 transcriptional memory is lost, leading to nucleoplasmic localization after repression and slower reactivation of the gene. Thus, interaction of recently repressed INO1 with the NPC alters its chromatin structure and rate of reactivation.

摘要

酵母基因启动子中的 DNA“邮政编码”赋予其与 NPC 的相互作用,并在激活时定位于核周。其中一些基因表现出转录记忆:被抑制后,它们在核周保留几代,为重新激活做好准备。转录记忆需要组蛋白变体 H2A.Z。我们发现,活性 INO1 和最近被抑制的 INO1 靶向核周是由两个不同的、独立的机制控制的,涉及不同的“邮政编码”和与 NPC 的不同相互作用。INO1 启动子中的 11 个碱基对记忆募集序列 (MRS) 控制着抑制后的外周靶向和 H2A.Z 掺入。在缺乏 MRS 或 NPC 蛋白 Nup100 的细胞中,INO1 的转录记忆丢失,导致抑制后核质定位和基因的再激活速度变慢。因此,最近被抑制的 INO1 与 NPC 的相互作用改变了其染色质结构和再激活的速度。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索