氧化酶的气体道工程重新编程细胞中缺氧信号
Peter Windsor1, Haiping Ouyang2, Joseph A G da Costa1
1Department of Chemistry University of Minnesota, Twin Cities Minneapolis, MN, 55455, United States.
bioRxiv : the preprint server for biology
|August 23, 2023
概括
科学家们设计了prolyl氧酶2 (PHD2) 酶,以增强细胞对低氧 (低氧) 的反应. 这种对缺氧信号的重编程为控制缺氧诱导因子 (HIF) 途径提供了新的策略.
科学领域:
- 生物化学 生化学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 细胞通过复杂的信号通路感知并响应氧气水平.
- 酸酶2 (PHD2) 是一个关键的氧气传感器,对于调节细胞对低氧反应至关重要.
- 低氧诱导因子 (HIF) 在细胞适应低氧条件时起着核心作用.
研究的目的:
- 通过设计氧气传感器PHD2.2,重新编程细胞缺氧信号.
- 调查PHD2的气体道在氧气感应和催化活性中的作用.
- 开发增强的PHD2变种来调节缺氧诱导因子 (HIF) 信号.
主要方法:
- 计算建模和蛋白质工程修改PHD2的气体道.
- 使用氧化 (NO) 作为替代气体进行动力停止流量测量.
- 酶动力学测试以确定催化效率 (kcat/KM).
- 哺乳动物细胞转移 (HEK-293T) 在体内评估PHD2突变的功能.
主要成果:
- 在PHD2的气体道内确定了限制氧气流量的关键残留物.
- 改造PHD2突变,显著提高氧结合率和催化效率 (增加多达9倍).
- 在低氧条件下,在表达工程PHD2突变的细胞中,证明了降低HIF-1α水平和下游基因表达.
结论:
- 工程PHD2气体道是一个可行的策略,以提高其氧气传感能力.
- 激活的PHD2提供了一种新的途径来重编程细胞低氧反应.
- 这种方法为调节各种生物环境中的HIF信号提供了新的工具.
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