一个长期增长稳定的Halomonas sp. 删除了由其代谢网络模型Halo-ecGEMEM指导的多重转移酶
Lizhan Zhang1, Jian-Wen Ye1, Gang Li2
1School of Life Sciences, Tsinghua University, Beijing, 100084, China.
Metabolic engineering
|June 20, 2024
概括
微生物宿主中的基因组不稳定性,如哈洛蒙纳斯蓝色生,阻碍了生物生产. 这项研究确定了转子子为原因,为工业生物技术应用开发了一个稳定的细胞工厂.
科学领域:
- 合成生物学和生物技术
- 微生物工程 微生物工程
- 代谢工程是代谢工程.
背景情况:
- 微生物不稳定性是工业生物技术的一个重大挑战,限制了细胞工厂的效率.
- 哈洛莫纳斯蓝基因是下一代工业生物技术 (NGIB) 的有希望的底盘,因为它能够在开放和不无菌条件下运行.
- 对H. bluephagenesis的基因组和新陈代谢的有限理解阻碍了其优化用于细胞工厂工程.
研究的目的:
- 描述H. bluephagenesis TD01.01的代谢场景和应激反应机制.
- 为增强生物生产设计稳定的微生物底盘.
- 为了确定H. bluephagenesis微生物不稳定性的遗传基础.
主要方法:
- 基因组测序和注释 H. bluephagenesis TD01,揭示了1889个与生物过程相关的基因.
- 构建一个受酶约束的基因组规模代谢模型 (Halo-ecGEM),以模拟养批次发酵.
- 整合基因本体学 (GO) 精细期丰富和基于计算真空技术 (CVT) 的奥米克分析,以分析盐应激反应.
- 由Halo-ecGEM模型指导的八个转移酶的删除.
主要成果:
- 基因组序列揭示了广泛的生物过程信息,使Halo-ecGEM模型的构建成为可能.
- 盐应激会导致细胞资源在翻译和蛋白质代谢方面发生显著的重新分配.
- 移转酶的删除使H.蓝菌的生长稳定性和多基酸盐 (PHA) 产生的稳定性明显改善,包括PHB,PHBV和P34HB.
结论:
- 基因组编码的转子被确定为培养过程中微生物不稳定的主要原因.
- 经过工程设计的H. bluephagenesis底盘显示了长期的生长稳定性,适合工业应用.
- 这项研究提供了对H. bluephagenesis代谢和应激反应的关键见解,为先进的细胞工厂发展铺平了道路.
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