转录概况揭示了阿基尼因对Actinobacillus succinogenes生长和发酵的影响
Zuomu Xie1, Chunmei Chen1, Yuan Tian1
1The Key Laboratory of Industrial Biotechnology, School of Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China.
World journal of microbiology & biotechnology
|February 26, 2025
概括
阿克蒂诺巴西勒斯 (Actinobacillus succinogenes) 利用阿尔金因代谢来抵抗酸性压力,在低pH下增长和提升酸产量. 阿尔吉尼因 (Arginine) 是一种素.
科学领域:
- 微生物学 微生物学
- 代谢工程是代谢工程.
- 生物技术是生物技术.
背景情况:
- 阿克蒂诺巴西勒斯 (Actinobacillus succinogenes) 是一种有前途的微生物,用于生产黄酸 (SA).
- 对其遗传和代谢途径的有限理解阻碍了对工业应用的优化.
研究的目的:
- 调查阿金代谢在A. succinogenes生长和SA生产中的作用.
- 阐明氨酸在发酵过程中对酸性应激耐受性的影响.
主要方法:
- 使用高通量RNA测序进行转录组分析.
- 对argH基因 (argininosuccinate lyase) 进行过度表达和淘汰的基因操纵.
- 在摇瓶和3L生物反应器中在不同pH值下进行发酵实验.
主要成果:
- 在较晚的发酵阶段 (34h vs 8h) 观察到的糖脂代谢和氨酸生物合成基因的升调.
- 外源性氨酸和增强的氨酸流改善了低pH (5.0-6.0) 的细胞生长和SA产量.
- 氨酸补充剂在中性pH (6.0-7.0) 时没有显著影响生长或SA产量.
- 在生物反应器环境中,过度表达 argH 并没有在中性pH下增强SA产量.
结论:
- 在A. succinogenes中,氨酸的代谢对于抗酸压力而不是直接的SA生产至关重要.
- 维护阿尔金因代谢途径的完整性支持在酸性条件下强大的生长.
- 这些发现为A. succinogenes在工业发酵中的生理适应提供了洞察力.
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