开发用于工业酶生产的新型和高效的Corynebacterium glutamicum基因表达系统
Miao Wang1, Xiaoxin Ren1, Ziqi Wu1
1College of Life Sciences, Hebei Agricultural University, Baoding 071000, China.
Journal of microbiological methods
|April 14, 2025
概括
研究人员使用CRISPR-Cpf1基因编辑设计了Corynebacterium glutamicum用于工业酶生产. 这为细胞外酶分泌创造了高效的L-氨酸诱导系统,显示出高表达和活性.
科学领域:
- 微生物生物技术 微生物生物技术
- 合成生物学 合成生物学
- 酶工程是什么? 酶工程是什么?
背景情况:
- 工业酶生产需要具有高效基因表达,低成本诱导和细胞外分泌能力的微生物宿主.
- 现有的系统通常面临诱导器成本和分泌效率的局限性,阻碍了大规模的酶制造.
- 科里尼细菌 (Corynebacterium glutamicum) 是工业生物技术的多功能宿主,但需要优化以提高蛋白质的生产和分泌.
研究的目的:
- 构建和评估用于工业酶生产的工程化Corynebacterium glutamicum宿主中的新型L-氨酸诱导基因表达系统.
- 利用CRISPR-Cpf1基因编辑开发一个互补的选择标记系统并优化细胞外蛋白质分泌.
- 为了测试这些系统的有效性,使用α-amylase (AmyF) 作为记者蛋白.
主要方法:
- 通过使用CRISPR-Cpf1基因编辑,删除特定的种族酶基因并集成一个阿拉比诺斯浸透酶基因,设计了一种Corynebacterium glutamicum宿主菌株 (ΔalraraE ΔmurI).
- 构建了两种分泌类型表达载体 (pAU30S和pAU30T),利用氨酸种族酶 (alr) 基因作为选择标记物和基于B. subtilis AraR的负控制系统来诱导L-arabinose.
- 通过表达和分泌Geobacillus stearothermophilus α-amylase (AmyF) 并分析其活性和分泌效率来测试系统.
主要成果:
- 经过工程设计的C. glutamicum菌株与开发的表达载体证明了复合AmyF.的高效L-阿拉比诺斯诱导表达.
- SDS-PAGE和活性测定证实了活跃的AmyF在培养基中的成功细胞外分泌.
- 开发的系统在记者蛋白表达和分泌方面表现出高效率,验证了它们在工业应用中的潜力.
结论:
- 改造的Corynebacterium glutamicum菌株和相关的L-氨酸诱导表达系统 (C. glutamicum ΔalraraE ΔmurI/pAU30S和C. glutamicum ΔalraraE ΔmurI/pAU30T) 是工业酶生产的高效平台.
- 这些系统为分泌酶的分泌生产提供了具有成本效益和效率的解决方案,解决了工业应用的关键要求.
- 该研究强调了CRISPR-Cpf1技术在开发生物技术中先进的微生物细胞工厂中的实用性.
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