灵长类动物特定的Nedd4-1异型通过Ser/Thr酸化和14-3-3结合来调节基质结合
George Kefalas1,2, Daniela Rotin3,4
1Cell Biology Program, the Hospital for Sick Children, PGCRL 19-9715, 686 Bay Street, Toronto, ON, M5G 0A4, Canada.
Scientific reports
|October 20, 2023
概括
替代拼接产生一种新的Nedd4-1(NE) 异型,具有增强的E3泛基因酶活性. 这种灵长类动物特有的变体表现出独特的基质相互作用和调节机制,扩大了Nedd4-1.的功能表现.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 恩德4 (Nedd4-1) 是一种关键的E3泛素酶,调节生长因子受体信号传递.
- 规范的Nedd4-1具有C2-WW(4) -HECT域结构.
- 替代拼接产生鲜为人知的非正规Nedd4-1异型.
研究的目的:
- 描述Nedd4-1(NE),一种灵长类动物特有的Nedd4-1异型,具有N端延伸 (NE).
- 研究Nedd4-1的活性,调节和基质相互作用.
主要方法:
- 在人类组织和细胞系中进行mRNA表达分析.
- 生物化学测试来比较Nedd4-1 ((NE) 和正规的Nedd4-1活动.
- 在东北地区确定14-3-3蛋白结合点.
- 对RPB2子单位结合Nedd4-1(NE) 的分析.
主要成果:
- Nedd4-1(NE) mRNA是无处不在的表达.
- Nedd4-1(NE) 的催化活性高于正规的Nedd4-1,可能是由于缺乏C2域自身抑制.
- 在NE区域的两个残基与14-3-3蛋白结合,减少基质对酸化的结合.
- NE区域与RPB2结合,这是一种针对Nedd4-1的新型基质.
结论:
- 对Nedd4-1的替代拼接产生了功能上不同的异型.
- 与正典形式相比,Nedd4-1(NE) 拥有独特的监管机制,有约束力的合作伙伴和基板.
- 这些发现凸显了替代拼接对E3无素酶功能和调节的重大影响.
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