通过β-到-α形态转换器对TDP-43自我结合的氧化调节
Jinge Gu1, Xiaoming Zhou1, Lillian Sutherland1
1Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75235.
概括
氧化触发了TDP-43蛋白的结构切换,将其从自我关联的β-链转移到α-螺旋. 这种受脂质影响的氧化开关可能控制细胞中的蛋白质定位和功能.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- TDP-43蛋白的低复杂性域 (LCD) 包含一个进化保守的区域,能够采用α-螺旋或β-链形状.
- 在它的β-链形式中,TDP-43经历自我结合,形成可变的,交叉β结构,驱动相分离到蛋白质滴.
研究的目的:
- 为了研究TDP-43液晶显示器内的β-链和α-螺旋形状之间的相互关系.
- 探索氧化和脂质相互作用在调节TDP-43自我关联和相分离中的作用.
- 假设这种氧化开关在控制脊椎动物细胞局部翻译中的重要性.
主要方法:
- 监测蛋白滴的形成和分解,以评估自我关联.
- 使用过氧化来诱导TDP-43液晶显示器内的氨酸残留物的氧化.
- 采用1,6-hexanediol来研究可变蛋白结构的解离.
- 研究与脂类洗剂的相互作用,以探测形状变化.
主要成果:
- 用过氧化氧化TDP-43液晶的氧化分解了交叉β结构,消除了自我关联和相位分离.
- 这种氧化过程相互促进同一区域的α-螺旋结构的形成.
- 脂质相互作用增强了从β链切换到α螺旋形状的转换,后者与脂质类洗剂相互作用.
结论:
- TDP-43液晶显示器在β链介导的自我关联和α螺旋结构之间经历了氧化切换.
- 脂质相互作用可以调节这种形状交换机,这表明它在调节TDP-43功能方面发挥了作用.
- 假设控制这种氧化开关对于脊椎动物细胞的局部翻译调节至关重要.
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