序列组成和CRE动图的位置会影响CcpA蛋白的结合能力
Dengke Li1, Jiejie Guo1, Zhiqiang Zhang1
1Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, The College of Biotechnology, Tianjin University of Science and Technology, No.29, 13th Avenue, Tianjin Economic and Technological Development Area, Tianjin 300457, PR China.
International journal of biological macromolecules
|August 27, 2023
概括
细菌CcpA蛋白通过催化剂反应元素 (CREs) 调节基因表达. 了解CRE序列和结构变异揭示了CcpA结合强度是如何调节的,从而使促进体工程能够增强酶的生产.
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:
- 细菌催化剂控制蛋白 (CcpA) 对于碳催化剂抑制 (CCR) 是至关重要的.
- CcpA与特定的DNA序列结合,称为触媒反应元素 (CREs),以调节基因表达.
- 对CcpA结合的CRE序列和结构变异的确切影响仍然不完全理解.
研究的目的:
- 研究多样化的CRE序列和结构是如何被CcpA识别和结合的.
- 阐明CRE动机变化与CCpA介导的基因调节之间的关系.
- 在Bacillus subtilis中设计一种促进剂,以增强转录和细胞外酶的产生.
主要方法:
- 来自α-氨酶促进体的CRE动机多个突变的分析.
- 分子对接模拟用于预测CcpA-CRE结合相互作用.
- 自由能量计算以量化结合亲和关系.
- 一个促进器的工程,用于高水平的转录.
主要成果:
- 在CRE基因中破坏保存的核酸会削弱CcpA结合.
- 改变CRE对称性和接近转录起点的位置会影响CcpA依赖的调节.
- 一个工程促进剂显示出高的转录活性.
- 细胞外酶活性升高 (性蛋白酶,角酶等) 在Bacillus amyloliquefaciens中实现了.
结论:
- 微妙的CRE动机变化显著影响CcpA监管效应.
- 了解CRE-CcpA相互作用,可以进行合理的促进器设计.
- 这项研究为将CRE动机分析应用于生物技术应用中的其他Bacillus促进体提供了一个框架.
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