在真菌光传感器 Vivid 中进行符合性切换
Brian D Zoltowski1, Carsten Schwerdtfeger, Joanne Widom
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.
概括
这种神经虫crassa Vivid 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
- 结构生物学是结构生物学.
背景情况:
- 神经的光受体Vivid在调节蓝光反应和昼夜时钟方面发挥着至关重要的作用.
- 了解Vivid光感应的结构和机制基础对于破译其生物功能至关重要.
研究的目的:
- 阐明了Neurospora crassa Vivid光受体的光诱导激活的基础结构机制.
- 调查特定氨基酸残留物和辅因子相互作用在Vivid信号通路中的作用.
主要方法:
- 采用X射线晶体学来确定Vivid在黑暗和明亮状态中的高分辨率结构.
- 进行了生物化学测试,以分析光诱导的囊蛋白-黄添加物的形成及其对蛋白质构成的影响.
- 用于检测关键残留物的功能,包括氨酸替代氨酸.
主要成果:
- 晶体结构揭示了一个独特的Per-Arnt-Sim域,具有N终端盖和容纳flavin辅因子的循环.
- 光诱导的囊蛋白-黄添加物的形成导致黄质子和N端形状变化,激活Vivid.
- 一个从氨酸到氨酸的突变取消了光诱导的信号,证明了这种残留物在激活机制中的关键作用.
结论:
- 这项研究揭示了Vivid的新型光激活机制,涉及囊蛋白-黄 adduct形成和形状变化.
- 维维德激活的关键结构和机制元素在其他相关的光传感器中得到保留,这表明它们具有共同的进化起源.
- 这些发现为Vivid和相关的蓝光光受体在调节生物过程中的功能提供了关键的见解.
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