The JmjC domain of Gis1 is dispensable for transcriptional activation.

The JmjC domain of Gis1 is dispensable for transcriptional activation.
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DOI:
10.1111/j.1567-1364.2010.00680.x
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发表时间:
2010-11
影响因子:
3.2
通讯作者:
Sternglanz R
Sternglanz R
中科院分区:
生物学4区
文献类型:
--
作者:
Yu Y;Neiman AM;Sternglanz R

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酵母 Gis1 蛋白在营养限制和氧化应激后充当转录因子。在本报告中,我们表明 Gis1 还调节孢子形成过程中参与孢子壁合成的几个基因的诱导。 Gis1 在其 N 末端附近包含一个 JmjC 结构域。在许多蛋白质中,JmjC 结构域提供组蛋白去甲基酶活性。 Gis1 的 JmjC 结构域是否有助于其转录激活尚不清楚。在这里,我们表明,废除 Fe (II) 和 α-酮戊二酸(其他 JmjC 蛋白中已知的辅助因子)结合的 gis1 点突变仍然能够在葡萄糖饥饿和孢子形成期间正常诱导转录。即使删除整个 JmjC 结构域也不会影响 Gis1 的转录激活。此外,JmjC 结构域对于 Gis1 过表达相关的毒性来说不是必需的。数据表明,JmjC 结构域对于营养胁迫和孢子形成期间 Gis1 的转录激活是可有可无的。
Yeast Gis1 protein functions as a transcription factor after nutrient limitation and oxidative stress. In this report, we show that Gis1 also regulates the induction of several genes involved in spore wall synthesis during sporulation. Gis1 contains a JmjC domain near its N-terminus. In many proteins JmjC domains provide histone demethylase activity. Whether the JmjC domain of Gis1 contributes to its transcriptional activation is still unknown. Here we show that gis1 point mutations that abolish Fe (II) and α-ketoglutarate binding, known co-factors in other JmjC proteins, are still able to induce transcription normally during glucose starvation and sporulation. Even deletion of the whole JmjC domain does not affect transcriptional activation by Gis1. Moreover, the JmjC domain is not required for the toxicity associated with Gis1 overexpression. The data demonstrate that the JmjC domain is dispensable for transcriptional activation by Gis1 during nutrient stress and sporulation.
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