新型转录因子调节细胞酶表达和增长改善在细胞分解性真菌
Chunying Li1,2, Shijia Dong1, Mingjuan Cui2
1School of Geography and Tourism, Harbin University, Harbin, 150086, China.
Microbial cell factories
|November 29, 2025
概括
在Talaromyces endophyticus中发现了一种新型的转录因子TeSrdA. 删除TeSrdA显著增强了细胞酶和半细胞酶的产生,并加速了微生物的生长,为生物燃料生产提供了新的途径.
科学领域:
- 菌类学 菌类学是指菌类学.
- 分子生物学分子生物学
- 生物技术是生物技术.
背景情况:
- 塔拉罗米切斯 (Talaromyces) 种类. 它们具有强大的细胞分解酶,由复杂的转录因子调节.
- 关于Talaromyces细胞酶基因表达的特定转录调节器的研究有限.
- 了解这些机制对于优化用于生物燃料和有价值产品的纤维素生物质的使用至关重要.
研究的目的:
- 为了研究Talaromyces endophyticus NEAU-6中一种新型的转录因子,NEAU-6是一种高细胞酶生成菌株.
- 阐明这种转录因子在调节细胞酶和半细胞酶基因表达中的作用及其对真菌生长的影响.
- 为了提供对控制Talaromyces酶生产的转录调节网络的见解.
主要方法:
- 转录因子TeSrdA.的识别和表征.
- 基因删除突变结构 (ΔTeSrdA) 和酶活动的分析 (FPase,CMCase,PNPCase,β-葡萄糖酶,西兰酶).
- 形形态的微观分析,生长速度评估,定量逆转录聚合酶连锁反应 (RT-qPCR) 和电泳运动转移试验 (EMSA).
主要成果:
- 证实TeSrdA是一种核蛋白. 删除TeSrdA导致细胞酶和西兰酶活动显著增加.
- 与野生类型相比,ΔTeSrdA突变体表现出增强的枝分支,增加的枝长度和加速的微生物生长.
- RT-qPCR和EMSA表明,TeSrdA直接与关键酶基因 (例如,eg7A,cbh6A,bgl3A,xyl11A) 的促进子区域结合,抑制它们的转录,从而抑制酶的产生.
结论:
- 在Talaromyces endophyticus中,TeSrdA作为细胞酶和半细胞酶生产的抑制剂.
- 删除TeSrdA有助于真菌生长,细胞发育,并大大提高了有价值的工业酶的生产.
- 这项研究确定了TeSrdA作为一个关键的调节器,对旨在提高工业应用酶产量的代谢工程策略有重大影响.
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