在低氧诱导因素中的结构整合
Dalei Wu1, Nalini Potluri1, Jingping Lu1
1Metabolic Disease Program, Sanford Burnham Prebys Medical Discovery Institute, Orlando, Florida 32827, USA.
Nature
|August 7, 2015
概括
低氧诱导因子 (HIF) 调节细胞适应低氧,促进瘤生长. 通过详细描述小分子结合点,对HIF-α-ARNT异构体的结构洞察力揭示了潜在的抗癌药物点.
科学领域:
- 生物化学
- 分子生物学
- 结构生物学
背景情况:
- 低氧诱导因子 (HIF) 是细胞对低氧反应的关键调节者.
- 这些基因参与红色形成,血管生成和新陈代谢,对于瘤生长和进展至关重要.
- 由于HIF在瘤形成中的作用,它们是有吸引力的抗癌点.
研究的目的:
- 阐明HIF-α-ARNT异构体功能的结构基础.
- 确定针对癌症治疗的HIF异构体上潜在的小分子结合部位.
- 了解低氧反应元 (HRE) 识别的结构机制.
主要方法:
- 使用X射线结晶学来确定小鼠HIF-2α-ARNT和HIF-1α-ARNT异构体的结构.
- 通过小分子和DNA (低氧反应元素) 解决了结构.
- 分析四级结构,小分子结合口袋和DNA结合接口.
主要成果:
- 获得了HIF-2α-ARNT和HIF-1α-ARNT异构体的详细晶体结构.
- 观察到一个保存的四级结构,ARNT围绕HIF-α子单元旋转.
- 确定了五个不同的小分子结合口袋,包括PAS域位和界面腔.
- 结合DNA的头部和远端PAS域合作以有效地识别缺氧反应元素.
- 与癌症相关的HIF-α突变被映射到影响DNA结合和域稳定的功能关键区域.
结论:
- 结构数据提供了对HIF异构体组合和功能的机制理解.
- 已识别的小分子结合点为开发针对HIF的新型抗癌药物提供了机会.
- 了解HIF-DNA相互作用对于设计破坏瘤转录程序的抑制剂至关重要.
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