Enhanced HSP70 lysine methylation promotes proliferation of cancer cells through activation of Aurora kinase B.

Enhanced HSP70 lysine methylation promotes proliferation of cancer cells through activation of Aurora kinase B.
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DOI:
10.1038/ncomms2074
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发表时间:
2012
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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热休克蛋白70(HSP70)是一种进化上高度保守的分子伴侣,在翻译后可通过磷酸化、泛素化和糖基化等方式进行修饰,但赖氨酸甲基化的生理意义尚未阐明。在这里,我们确定了HSP70在Lys-561上的二甲基化是由SETD1A完成的。虽然在相应的非肿瘤组织中几乎检测不到甲基化,但通过免疫组织化学分析,在各种类型的人类癌症中检测到了增强的HSP70甲基化。有趣的是,甲基化的HSP70主要定位于癌细胞的细胞核,而大多数HSP70蛋白定位于细胞质。核HSP70以甲基化依赖的方式直接与极光激酶B(AURKB)相互作用,并在体外和体内促进AURKB的活性。我们还发现,甲基化的HSP70在癌细胞中具有促进生长的作用。我们的发现证明了HSP70甲基化在人类癌症发生中的关键作用。HSP70是一种帮助蛋白质折叠的分子伴侣。在这项研究中,HSP70被证明是甲基化的,这种翻译后修饰的蛋白在人类癌症中的表达增加,并促进了极光激酶B的活性。
Although heat-shock protein 70 (HSP70), an evolutionarily highly conserved molecular chaperone, is known to be post-translationally modified in various ways such as phosphorylation, ubiquitination and glycosylation, physiological significance of lysine methylation has never been elucidated. Here we identify dimethylation of HSP70 at Lys-561 by SETD1A. Enhanced HSP70 methylation was detected in various types of human cancer by immunohistochemical analysis, although the methylation was barely detectable in corresponding non-neoplastic tissues. Interestingly, methylated HSP70 predominantly localizes to the nucleus of cancer cells, whereas most of the HSP70 protein locates to the cytoplasm. Nuclear HSP70 directly interacts with Aurora kinase B (AURKB) in a methylation-dependent manner and promotes AURKB activity in vitro and in vivo. We also find that methylated HSP70 has a growth-promoting effect in cancer cells. Our findings demonstrate a crucial role of HSP70 methylation in human carcinogenesis. HSP70 is a molecular chaperone that aids protein folding. In this study, HSP70 is shown to be methylated and this post-translationally modified protein is elevated in expression in human cancers and promotes the activity of Aurora kinase B.
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