HOXA9的内在无序的交换激活区域通过自身抑制其DNA结合活性来调节其功能
Nikita V Saibo1, Snigdha Maiti1, Soumendu Boral1
1School of Bioscience, Indian Institute of Technology Kharagpur, Kharagpur, WB 721302, India.
International journal of biological macromolecules
|June 2, 2024
概括
这是一种HOXA9蛋白质.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 血液形成 血液形成 血液形成
背景情况:
- HOXA9是一种转录因子,对造血干细胞分化至关重要.
- HOXA9失调与白血病有关,特别是急性髓性白血病 (AML),作为一个不良的预后标志物.
- HOXA9有一个DNA结合的宿主域和一个事务激活域.
研究的目的:
- 阐明HOXA9.9的N终端交换激活域的结构和功能作用.
- 调查交换活化域调节HOXA9 DNA 结合活性的机制.
- 探索交易域在HOXA9功能中的双重作用,无论是独立的还是与TALE合作伙伴一起的.
主要方法:
- 核磁共振 (NMR) 谱学用于研究蛋白质结构和动态.
- 分子动力学模拟以建模蛋白质行为.
- 位点定向突变发生,以评估特定氨基酸变化的影响.
主要成果:
- 霍克萨9的N端交换激活域本质上是无序的.
- 在这个无序的区域内,一种特定的六 (AANWLH202) 通过遮住主体界面来自动抑制HOXA9的DNA结合.
- 这种六化物在灵活的无序区域内采用了刚性构造,并与TALE合作伙伴 (如PBX1.1) 进行交互.
- 在六中突变关键的托残留物取消了自身抑制作用.
- 混乱的区域促进了依赖TALE的合作DNA结合.
结论:
- HOXA9的无序交易激活区域表现出双重的监管作用.
- 在孤立状态下,它作为DNA结合的自身抑制剂.
- 在与 TALE 合作伙伴互动时,它促进了合作性 DNA 结合,提出了依赖上下文的转录调节机制.
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