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通过CRISPR/Cas9n在Bacillus subtilis中高效表达γ-glutamyl转酶及其固定
Qianlin Chen1, Bin Wang1, Li Pan2
1School of Biology and Biological Engineering, Guangzhou Higher Education Mega Centre, South China University of Technology, Panyu District, Guangzhou, 510006, Guangdong, People's Republic of China.
Applied microbiology and biotechnology
|January 19, 2024
概括
研究人员开发了一种新的方法,使用Bacillus subtilis有效生产像胺酶 (GGT) 这样的酶. 这种方法还可以制造适合食品工业的无标记酶制剂.
科学领域:
- 生物技术是生物技术.
- 酶工程是什么? 酶工程是什么?
- 微生物发酵 微生物发酵
背景情况:
- 对于工业应用而言,高效生产像胺酶 (GGT) 这样的酶至关重要.
- 现有的方法经常面临表达水平和最终产品中存在抗性标记的挑战.
- 开发无标记物表达系统对于食品行业的安全应用至关重要.
研究的目的:
- 开发一种高效的策略,以表达和生产来自Bacillus subtilis中的Bacillus物种的GGT酶.
- 为重组蛋白质生产构建一种无抗性标志物表达系统.
- 为了优化产生的GGT酶的固定和应用.
主要方法:
- 结合联促进剂和信号与信号酶过度表达以增强GGT表达.
- 利用CRISPR/Cas9n-AID基编辑来从Bacillus subtilis的表达载体中删除抵抗标记.
- 使用环氧树脂固定复合杆菌 licheniformis GGT (BlGGT) 并评估其稳定性和可重复使用性.
- 应用固定BlGGT用于连续合成theanine.
主要成果:
- 在 Bacillus subtilis 中实现了 BsGGT,BaGGT 和 BlGGT 酶的有效表达.
- 成功构建了一个没有抗性标记的重组蛋白表达载体.
- 在摇瓶发酵过程中,BLGGT菌株的酶活性达到53.65U/mL.
- 固定的BLGGT在10次使用后保持了82.8%的活性,在2个月的储存后保持了87.36%.
- 使用固定BLGGT的连续theanine合成实现了65.38%的转化率.
结论:
- 开发的策略有效地提高了酶的生产,并为食品工业创造了安全的,无标记物的酶制剂.
- 克里斯普尔/Cas9n-AID系统是有效的,用于构建无标记物表达载体在Bacillus subtilis.
- 优化blggt的固定,确保工业应用的高稳定性和可重复使用性.
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