CyAbrB2是Synechocystis中的一个与核相关的蛋白质,在发酵过程中控制酶表达
Ryo Kariyazono1, Takashi Osanai1
1School of Agriculture, Meiji University, Kawasaki, Japan.
eLife
|September 2, 2024
概括
蓝藻细菌核体相关蛋白 cyAbrB2 通过改变 DNA 结构来调节化酶 (HOX) 操作子的表达. 它在微氧条件下与SigE控制霍克斯转录的动态结合和相互作用.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 在Synechocystis sp.中的假操作子. PCC 6803对于 (H2) 生产至关重要,在微氧条件下上调.
- 精确的调节机制和高阶DNA结构控制微氧体中的假操作子转录尚未完全理解.
研究的目的:
- 研究cyAbrB2和SigE在调节假操作子中的作用.
- 阐明微氧条件对这些调节者的动力学和霍克斯区域的DNA结构的影响.
主要方法:
- 染色体免疫沉测序 (ChIP-seq) 用于识别cyAbrB2和SigE的结合部位.
- 对cyAbrB2结合模式的全基因组分析.
- 对霍克斯促进体区域及其偏远基因组位置内的物理相互作用的分析.
主要成果:
- 在有氧条件下,cyAbrB2与hox促进体结合,抑制转录,但其结合在microoxia下降.
- 在微氧条件下,SigE显示了对hox促进体的局部化增加.
- cyAbrB2 作为核相关蛋白 (NAP) 调节染色体构造,影响霍克斯促进体的可访问性.
结论:
- cyAbrB2 作为 NAP 起作用,阻断RNA聚合酶以有氧方式进入霍克斯促进体.
- 在微氧下改变的cyAbrB2局部化改变了染色体构造,使SigE介导的假转录成为可能.
- NAPs和替代西格玛因子的协调作用对于蓝藻细菌的转录调节至关重要.
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