波谱学杂志 ›› 2022, Vol. 39 ›› Issue (1): 87-95.doi: 10.11938/cjmr20212901

• 研究论文 • 上一篇    下一篇

T69E模拟磷酸化修饰对Bcl-2与Nur77相互作用的影响

徐倩1,2,陈朗1,2,胡翔颖1,李从刚1,刘乙祥1,*(),姜凌1,*()   

  1. 1. 中国科学院生物磁共振分析重点实验室, 波谱与原子分子物理国家重点实验室, 武汉磁共振中心(中国科学院 精密测量科学与技术创新研究院), 湖北 武汉 430071
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2021-03-24 出版日期:2022-03-05 发布日期:2021-04-09
  • 通讯作者: 刘乙祥,姜凌 E-mail:yixiangliu@wipm.ac.cn;lingjiang@wipm.ac.cn
  • 基金资助:
    国家重点研发计划专项(2017YFA0505400);国家自然科学基金资助项目(21991082);国家自然科学基金资助项目(21925406)

The Effect of T69E-mimicked Phosphorylation on the Interaction Between Bcl-2 and Nur77

Qian XU1,2,Lang CHEN1,2,Xiang-ying HU1,Cong-gang LI1,Yi-xiang LIU1,*(),Ling JIANG1,*()   

  1. 1. CAS Key Laboratory of Magnetic Resonance in Biological System, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-03-24 Online:2022-03-05 Published:2021-04-09
  • Contact: Yi-xiang LIU,Ling JIANG E-mail:yixiangliu@wipm.ac.cn;lingjiang@wipm.ac.cn

摘要:

Bcl-2蛋白是Bcl-2家族中主要行使抗凋亡功能的蛋白质.核孤儿受体蛋白Nur77可出核定位至线粒体与其发生相互作用,促使Bcl-2的功能发生逆转,由细胞保护者转变为细胞杀手,从而促发细胞凋亡.Bcl-2的功能受翻译后修饰调控,如位于其BH3与BH4基序间无序loop区上T69位点的磷酸化.由于缺乏全长Bcl-2蛋白的结构信息,目前loop区T69的磷酸化修饰对两种蛋白相互作用的影响尚不清楚,缺乏原子水平的相关研究.因此,我们构建了含有loop区的胞内全长Bcl-2,并用T69E突变体模拟稳定的磷酸化修饰,综合运用圆二色谱(CD)、免疫印迹(Western Blot)、核磁共振(NMR)等技术手段对其相互作用进行研究.我们发现相比只含结构区的Bcl-2/xl嵌合体,胞内全长的Bcl-2和Nur77具有更强的相互作用,并且T69E模拟磷酸化修饰减弱了Bcl-2与Nur77的相互作用.该项研究对基于Bcl-2和Nur77信号转导通路和癌症细胞靶向凋亡的研究具有重要的参考意义.

关键词: Bcl-2, 核磁共振(NMR), 磷酸化, 蛋白质相互作用, 细胞凋亡因子

Abstract:

Bcl-2 mainly executes anti-apoptotic function in the Bcl-2 family. Nuclear orphan receptor Nur77 can be translocated from nucleus to mitochondria, then interact with Bcl-2 to reverse the function of Bcl-2 from a cell protector to a cell killer, thereby inducing cell apoptosis. The function of Bcl-2 is regulated by post-translational modification, such as the phosphorylation of T69 in the intrinsically disordered loop between BH3 and BH4 motifs. However, due to the lack of structural information of the full-length protein, the effect of phosphorylation modification of T69 in the loop region on the interaction of the two proteins is still unclear, and there is a lack of related research at the atomic level. Therefore, we constructed a full-length intracellular Bcl-2 containing loop region and T69E mutant to mimic stable phosphorylation modification, and investigated the interactions by combining circular dichroism (CD), Western blot and nuclear magnetic resonance (NMR) methods. It was observed that the full-length Bcl-2 had a stronger interaction with Nur77 compared to the Bcl-2/xl chimera, and the phosphorylation modification mimicked by T69E weakened the interaction between Bcl-2 and Nur77. The results will promote future research based on Bcl-2 and Nur77 signal transduction pathways and the apoptosis targeting cancer cells.

Key words: Bcl-2, nuclear magnetic resonance (NMR), phosphorylation, protein-protein interaction, apoptosis factor

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