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在PLEKHM2 mRNA解码过程中编程的核糖体框架转移会产生一个构成性活跃的蛋白形,支持心肌功能.

Gary Loughran1, Raffaella De Pace2, Ningyu Ding3,4

  • 1School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland.

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人类基因PLEKHM2中的编程核糖体框架转移允许制造第二种蛋白质. 这种框架转移蛋白对于正常心肌细胞功能至关重要.

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 遗传学 是一个
  • 细胞生物学 细胞生物学

背景情况:

  • 编程核糖体框架转移是一种已知的机制,主要在病毒中,用于产生蛋白质多样性.
  • 在核编码的人类基因中保存的框架转移事件是罕见的.
  • 人类基因PLEKHM2的功能和调节尚未完全理解.

研究的目的:

  • 为了研究人类基因PLEKHM2.2.中的一种新型编程核糖体框架转移事件.
  • 为了描述这种框架转移事件产生的蛋白质的功能.
  • 确定PLEKHM2框架转移在心脏细胞功能中的作用.

主要方法:

  • 来自人类PLEKHM2基因的mRNA和蛋白质产品的分析.
  • 现场定向突变发生,以研究移效率.
  • 创建和分析PLEKHM2淘汰赛心肌细胞模型.
  • 重新引入了正规和框架转移的PLEKHM2蛋白质.

主要成果:

  • 在人类的PLEKHM2基因中发现了一个+1编程的核糖体框架转移事件,产生了内部重叠的开放阅读框架 (ORF).
  • 框架转移的PLEKHM2蛋白质具有一种新型的α-螺旋式碳素终端域,可以缓解自身抑制.
  • 这种移蛋白使细胞局部化能够独立于ARL8激活到细胞尖端.
  • 恢复正常的心肌细胞收缩功能需要规范性和框架转移的PLEKHM2蛋白质.

结论:

  • 在PLEKHM2中编程的核糖体框架转移对于生成功能性蛋白质变体至关重要.
  • 框架转移的PLEKHM2蛋白在调节心肌细胞收缩性方面发挥着至关重要的作用.
  • 这一发现突显了核编码基因中的框架转移对于细胞过程的重要性.