And-1 is required for the stability of histone acetyltransferase Gcn5.

And-1 is required for the stability of histone acetyltransferase Gcn5.
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DOI:
10.1038/onc.2011.261
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发表时间:
2012-02-02
期刊:
影响因子:
8
通讯作者:
Zhu, W.
Zhu, W.
中科院分区:
医学1区
文献类型:
--
作者:
Li, Y.;Jaramillo-Lambert, A. N.;Yang, Y.;Williams, R.;Lee, N. H.;Zhu, W.

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组蛋白乙酰基转移酶(HAT)在染色质修饰以及包括癌症在内的广泛疾病的发病机制中起核心作用。Gcn 5是第一个被鉴定的转录相关组蛋白乙酰转移酶(HAT),它参与了多种细胞功能的调节。然而,Gcn 5蛋白是如何调控的在很大程度上仍然未知。在这里,我们表明,和-1(HMG结构域的蛋白质)具有显着的能力,以调节GCN 5蛋白的稳定性,从而组蛋白H3乙酰化。我们发现And-1与组蛋白H3和Gcn 5形成复合物。下调And-1导致Gcn 5降解,导致H3 K9和H3 K56乙酰化减少。And-1过表达通过体内蛋白质-蛋白质相互作用稳定Gcn 5。此外,在癌细胞中,And-1表达以与Gcn 5和H3 K9 Ac和H3 K56 Ac增加相关的方式增加。因此,我们的数据不仅揭示了Gcn 5和And-1之间的功能联系,这对调节Gcn 5蛋白稳定性和组蛋白H3乙酰化至关重要,而且还揭示了And-1在癌症中的潜在作用。
Histone acetyltransferases (HATs) play a central role in the modification of chromatin as well as in pathogenesis of a broad set of diseases including cancers. Gcn5 is the first identified transcription-related histone acetyltransferase (HAT) that has been implicated in the regulation of diverse cellular functions. However, how Gcn5 proteins are regulated remains largely unknown. Here we show that And-1 (a HMG domain-containing protein) has remarkable capability to regulate the stability of Gcn5 proteins and thereby histone H3 acetylation. We find that And-1 forms a complex with both histone H3 and Gcn5. Downregulation of And-1 results in Gcn5 degradation, leading to the reduction of H3K9 and H3K56 acetylation. And-1 overexpression stabilizes Gcn5 through protein-protein interactions in vivo. Furthermore, And-1 expression is increased in cancer cells in a manner correlating with increased Gcn5 and H3K9Ac and H3K56Ac. Thus, our data reveal not only a functional link between Gcn5 and And-1 that is essential to regulate Gcn5 protein stability and histone H3 acetylation, but also a potential role of And-1 in cancer.
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