RNF114和RNF166是阅读-写 E3 连接酶的例子,这些连接酶将K11 聚尤比基因扩展到MARUbylation的部位上
Rachel E Lacoursiere1, Kapil Upadhyaya2, Jasleen Kaur Sidhu1
1Department of Molecular Microbiology and Immunology, Oregon Health & Science University, Portland, OR, 97239, USA.
The EMBO journal
|October 2, 2025
概括
德莱克斯DTX2在PARP7上结合了ADP-ribose (ADPr) 修饰,而RNF114则通过K11结合的多比基因扩展了这一功能. RNF114通过一个新的M-UBD域识别这些单个ADPr-Ub Ester (MARUbe),识别MARUbe向性结合酶 (M-UTLs).
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 翻译后修改 翻译后修改
背景情况:
- 乌比奎丁 (Ub) 和ADP-核糖 (ADPr) 的修饰调节蛋白质.
- 德尔特克斯E3链酶可以在体外无处不在的ADPR含有分子.
- 之前已经观察到PARP7上的单-ADPr无处不在 (MARUbylation),由K11结合的多基因延伸.
研究的目的:
- 为了阐明参与PARP7 MARUbylation和随后的多比基因链扩展的E3链酶.
- 描述MARUbylated物种识别的分子机制.
- 为了识别针对MARUbe的新型E3链酶.
主要方法:
- 细胞测试以确定PARP7上的E3结合酶活性.
- 一个光Ub-ADPr探针的化学酶合成.
- 预测AlphaFold3结构以分析蛋白质-连接体相互作用.
- 用于测试E3酶特异性的生物化学测试.
主要成果:
- DTX2被确定为E3结合酶催化PARP7上的MARUbylation,这取决于PARP7的活动.
- 确定RNF114是负责PARP7 MARUbylation位点上K11结合的多基因延伸的E3结合酶.
- RNF114使用一个并联的Di19-UIM模块作为一个MARUbe-binding域 (M-UBD) 来识别MARUbylated基质.
- 描述了一个带有M-UBD域的MARUbe-Targeted Ligases (M-UTL) 家族.
结论:
- DTX2和RNF114连续作用,在PARP7.7上创建一个多层的无处不在信号.
- RNF114的M-UBD为MARUbylated蛋白提供了一个特定的识别机制.
- 发现M-UTL扩大了参与复杂的翻译后修饰途径的E3链酶的谱.
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