Structural insights into ADP-ribosylation of ubiquitin by Deltex family E3 ubiquitin ligases.

Structural insights into ADP-ribosylation of ubiquitin by Deltex family E3 ubiquitin ligases.
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DOI:
10.1126/sciadv.abc0418
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发表时间:
2020-09
期刊:
影响因子:
13.6
通讯作者:
Huang DT
Huang DT
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chatrin C;Gabrielsen M;Buetow L;Nakasone MA;Ahmed SF;Sumpton D;Sibbet GJ;Smith BO;Huang DT

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哺乳动物Deltex蛋白的C-末端RING和DTC结构域催化泛素C末端的ADP-核糖基化。泛素化和其他翻译后修饰之间的细胞串扰有助于许多过程的调节。一个例子是泛素羧基末端的ADP-核糖基化通过E3 DTX 3L/ADP-核糖基转移酶PARP 9异二聚体,但其机制仍然难以捉摸。在这里,我们表明,独立的PARP 9,保守的羧基末端环和DTC(Deltex羧基末端)域的DTX 3L和其他人类Deltex蛋白(DTX 1到DTX 4)催化ADP核糖基化泛素的Gly 76。结构研究揭示了DTC结构域在结合NAD+中的未知功能。Deltex RING结构域募集与泛素硫代酯化的E2,并将其与结合到DTC结构域的NAD+并置,以促进泛素的ADP-核糖基化。这种泛素修饰阻止其活化,但被连接非特异性去泛素化酶逆转。我们的研究为Deltex E3对泛蛋白的ADP核糖基化提供了机制见解,并将使未来的研究能够旨在了解日益复杂的泛蛋白串扰网络。
The C-terminal RING and DTC domains of mammalian Deltex proteins catalyze ADP-ribosylation at the C terminus of ubiquitin. Cellular cross-talk between ubiquitination and other posttranslational modifications contributes to the regulation of numerous processes. One example is ADP-ribosylation of the carboxyl terminus of ubiquitin by the E3 DTX3L/ADP-ribosyltransferase PARP9 heterodimer, but the mechanism remains elusive. Here, we show that independently of PARP9, the conserved carboxyl-terminal RING and DTC (Deltex carboxyl-terminal) domains of DTX3L and other human Deltex proteins (DTX1 to DTX4) catalyze ADP-ribosylation of ubiquitin’s Gly76. Structural studies reveal a hitherto unknown function of the DTC domain in binding NAD+. Deltex RING domain recruits E2 thioesterified with ubiquitin and juxtaposes it with NAD+ bound to the DTC domain to facilitate ADP-ribosylation of ubiquitin. This ubiquitin modification prevents its activation but is reversed by the linkage nonspecific deubiquitinases. Our study provides mechanistic insights into ADP-ribosylation of ubiquitin by Deltex E3s and will enable future studies directed at understanding the increasingly complex network of ubiquitin cross-talk.
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