由MAGEA4调节RAD18的结构基础及其对MAGE家族蛋白质对RING泛素酶结合的影响
Simonne Griffith-Jones1, Lucía Álvarez2, Urbi Mukhopadhyay1
1European Molecular Biology Laboratory, 71 Avenue des Martyrs, 38042, Grenoble, France.
The EMBO journal
|March 6, 2024
概括
癌症丸抗原MAGEA4与RAD18相互作用,抑制其自我ubiquitination并影响DNA修复. 这种通过NMR和AlphaFold2阐明的相互作用揭示了癌症治疗的潜在目标.
科学领域:
- 分子生物学分子生物学
- 结构生物学是结构生物学.
- 癌症研究 癌症研究
背景情况:
- MAGEA4是一种癌症丸抗原,在各种癌症中过度表达.
- MAGEA4与RAD18,一种RING泛基因酶相互作用,并影响转变损伤DNA合成 (TLS).
研究的目的:
- 使用结构生物学技术阐明RAD18和MAGEA4之间的相互作用模式.
- 了解RAD18介导的PCNA单-ubiquitination的调节机制.
主要方法:
- 核磁共振 (NMR) 谱学是指核磁共振的光谱学.
- 阿尔法Fold2 (AF) 蛋白质结构预测预测
- 交叉连接质谱法 (XL-MS) 是一种质谱法.
- 相互作用蛋白质组学
主要成果:
- RAD18的RAD6结合域 (R6BD) 与MAGEA4的C端翼螺旋子域中的一个槽结合.
- 通过取代RAD6.6,MAGEA4可以抑制RAD18的自化.
- 在RAD18中确定了一种分子内相互作用,这对于PCNA单-ubiquitination至关重要.
- MAGE-C2与TRIM28的相互作用类似于MAGEA4/RAD18,这表明MAGE蛋白结合机制保留.
结论:
- MAGEA4调节RAD18活动,影响与癌症相关的DNA修复途径.
- 这些发现提供了对MAGE蛋白与ubiquitin结合酶相互作用的结构性见解.
- 这项研究突出了MAGE型蛋白与酶结合的保存机制.
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