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增加酸通路流量,以改善工程E. coli中等离子体DNA的生产. 大肠杆菌

Mitzi de la Cruz¹, Flavio Kunert², Hilal Taymaz-Nikerel³

¹Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana, Mexico City 05348, Mexico.

|January 23, 2024

概括

工程大肠杆菌增强等离子体DNA (pDNA) 生产涉及优化酸通路 (PPP). 像同时摄入葡萄糖-甘油和G6PDH基因过度表达等策略显著提高了基因疗法和疫苗的pDNA产量和质量.

科学领域:

代谢工程是代谢工程.
分子生物学分子生物学
生物技术是生物技术.

背景情况:

在基因疗法和疫苗中对等离子体DNA (pDNA) 的需求日益增加,需要改进生产方法.
缺乏特定基因的工程E. coli菌株显示了增强的pDNA生产.
优化代谢通路,特别是酸通路 (PPP),对于高效的pDNA合成至关重要.

研究的目的:

通过增强穿过酸通路 (PPP) 的流量来改善工程 * E. coli * 菌株的pDNA 生产.
评估包括同时基质消耗和基因过度表达在内的策略,以提高pDNA产量和质量.
建立代谢活动和pDNA生产效率之间的关系.

主要方法:

通过删除特定的基因 (转移酶系统,酸盐激酶A) 来进行大肠杆菌的代谢工程.
培养策略包括同时消耗葡萄糖和甘油.
关键酸通路 (PPP) 基因的过度表达,包括葡萄糖6酸脱酶 (G6PDH).
使用流量平衡分析分析生长速度,pDNA生产速度,超卷积分数 (SCF) 和代谢流量.

主要成果:

同时摄入葡萄糖和糖会增加生长率,pDNA生产率和超卷分数 (SCF).
过度表达G6PDH显著改善了SCF,生长率和pDNA生产率,特别是在葡萄糖介质中.
在G6PDH活性和pDNA产量之间观察到直接的线性关系.
流量平衡分析证实了PPP流量的增加,并确定了三酸循环中的变化.

结论:

代谢策略,特别是通过G6PDH增强PPP流量,可以有效地促进人工大肠杆菌的pDNA生产和质量.
同时的葡萄糖-甘油养提供了一种简单但有效的方法来改善pDNA制造.
这些发现为先进的细胞工程策略提供了基础,以满足对高质量的pDNA日益增长的需求.

关键词:

葡萄糖 - 葡萄糖醇的共同利用酸酸盐路径的酸路径塑体DNA疫苗的使用方法

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