In vivo binding of active heat shock transcription factor 1 to human chromosome 9 heterochromatin during stress.

In vivo binding of active heat shock transcription factor 1 to human chromosome 9 heterochromatin during stress.
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DOI:
10.1083/jcb.200109018
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发表时间:
2002-03-04
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Vourc'h C
Vourc'h C
中科院分区:
其他
文献类型:
--
作者:
Jolly C;Konecny L;Grady DL;Kutskova YA;Cotto JJ;Morimoto RI;Vourc'h C

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哺乳动物热休克转录因子(HSF)1被应激激活是一个多步骤的过程,导致热休克基因的转录。与这些事件相一致的是HSF 1快速和可逆的重新分布到称为HSF 1颗粒的离散核结构,其功能仍然未知。关键特征是颗粒的数量与细胞倍性相关,表明存在染色体靶点。在这里,我们表明,在人类中,HSF 1颗粒定位于9 q11-q12异染色质区。在该位点内,HSF 1通过直接DNA-蛋白质相互作用与含有核小体的卫星III重复亚类结合。HSF 1颗粒的形成仅需要DNA结合能力和因子的三聚化。这是第一个转录激活因子在染色体特异性异染色质基因座上瞬时可逆积累的例子。
Activation of the mammalian heat shock transcription factor (HSF)1 by stress is a multistep process resulting in the transcription of heat shock genes. Coincident with these events is the rapid and reversible redistribution of HSF1 to discrete nuclear structures termed HSF1 granules, whose function is still unknown. Key features are that the number of granules correlates with cell ploidy, suggesting the existence of a chromosomal target. Here we show that in humans, HSF1 granules localize to the 9q11-q12 heterochromatic region. Within this locus, HSF1 binds through direct DNA–protein interaction with a nucleosome-containing subclass of satellite III repeats. HSF1 granule formation only requires the DNA binding competence and the trimerization of the factor. This is the first example of a transcriptional activator that accumulates transiently and reversibly on a chromosome-specific heterochromatic locus.
DOI: 10.1016/s0165-4608(98)00209-x
发表时间: 1999-04-15
影响因子: --
作者:
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