A feedback regulatory loop between methyltransferase PRMT1 and orphan receptor TR3.

A feedback regulatory loop between methyltransferase PRMT1 and orphan receptor TR3.
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甲基转移酶 PRMT1 和孤儿受体 TR3 之间的反馈调节环

DOI:
10.1093/nar/gkn941
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发表时间:
2009-02
影响因子:
14.9
通讯作者:
Wu Q
Wu Q
中科院分区:
生物学2区
文献类型:
--
作者:
Lei NZ;Zhang XY;Chen HZ;Wang Y;Zhan YY;Zheng ZH;Shen YM;Wu Q

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PRMT1是一种精氨酸甲基转移酶,在许多细胞过程中起重要作用。在这项研究中,我们证明了PRMT1和孤儿受体TR3之间的反馈调节回路。与另一种孤儿受体HNF4不同,TR3不被PRMT1甲基化,尽管它们之间相互作用。PRMT1结合通过延缓TR3蛋白降解,导致TR3细胞蛋白水平升高,从而以非甲基转移酶方式增强TR3的DNA结合和反活化活性。另一种辅激活子SRC-2与PRMT1协同作用调节TR3功能。反过来,TR3结合到PRMT1的催化结构域导致PRMT1甲基转移酶活性的抑制。这种抑制导致一些PRMT1底物的功能改变,包括STAT3和Sam68。在TR3敲除细胞和TR3敲除小鼠中,使用TR3激动剂进一步证实了TR3对PRMT1的负调控。综上所述,我们的研究不仅确定了PRMT1在TR3转激活中的调节作用(不依赖于甲基转移酶活性),而且还确定了TR3在抑制PRMT1甲基转移酶活性中的新功能。
PRMT1, an arginine methyltransferase, plays an important role in numerous cellular processes. In this study, we demonstrate a feedback regulatory loop between PRMT1 and the orphan receptor TR3. Unlike another orphan receptor HNF4, TR3 is not methylated by PRMT1 although they physically interact with each other. By delaying the TR3 protein degradation, PRMT1 binding leads to the elevation of TR3 cellular protein level, thereby enhances the DNA binding and transactivation activity of TR3 in a non-methyltransferase manner. Another coactivator SRC-2 acts synergistically with PRMT1 to regulate TR3 functions. In turn, TR3 binding to the catalytic domain of PRMT1 causes an inhibition of the PRMT1 methyltransferase activity. This repression results in the functional changes in some of PRMT1 substrates, including STAT3 and Sam68. The negative regulation of PRMT1 by TR3 was further confirmed in both TR3-knockdown cells and TR3-knockout mice with the use of an agonist for TR3. Taken together, our study not only identifies a regulatory role of PRMT1, independent on methyltransferase activity, in TR3 transactivation, but also characterizes a novel function of TR3 in the repression of PRMT1 methyltransferase activity.
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