设计D-乳酸响应促进剂/抑制剂系统作为Lactobacillus delbrueckii亚种的动态代谢工程工具. bulgaricus用于受控的D-乳酸生物合成
Payal Mukherjee1, Senthilkumar Sivaprakasam1
1Bioprocess Analytical Technology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology, Guwahati, Assam 781039, India.
Enzyme and microbial technology
|February 12, 2025
概括
在Lactobacillus delbrueckii中设计了一个D-乳酸 (DLA) 反应系统,以增强DLA的生产. 这种合成生物学方法优化了DLA生物合成和发酵,为生物治疗提供了新的工具.
科学领域:
- 合成生物学 合成生物学
- 代谢工程是代谢工程.
- 微生物生物技术 微生物生物技术
背景情况:
- 代谢工程利用合成逻辑电路来优化细胞功能.
- 从Pseudomonas fluorescens A506中选择了一个对D-乳酸 (DLA) 敏感的促进剂-抑制剂系统进行重新设计.
- 牛乳杆菌delbrueckii亚种. 这种细菌. bulgaricus VI104被选为增强DLA生产的宿主生物体.
研究的目的:
- 重新设计一个对DLA敏感的促进剂-抑制剂系统,以提高L. bulgaricus的敏感性和有效性.
- 将这个系统应用于微调调节DLA生物合成和生长/生产阶段的自主调节.
- 为了确认跨物种的兼容性,并阐明在监管系统中的分子相互作用.
主要方法:
- 监管架构的Codon优化. 监管架构的Codon优化.
- 使用度计和显微镜进行验证.
- 分子对接以研究抑制器-操作器相互作用.
- 在工程系统下游的D-乳酸脱酶 (dldh) 的过度表达.
- 在重组L. bulgaricus.中的功能评估.
主要成果:
- 在60-100毫米的DLA诱导度下观察到的工程系统的峰值性能.
- 该系统使生长和生产阶段的自主调节成为可能,降低了代谢负载.
- 证实了跨物种的兼容性.
- 分子对接揭示了D-LldR抑制剂和操作者DNA之间的关键非共价相互作用.
- 工程促进剂构造增加了2.15倍的DLA生物合成,在生物反应器中达到9.02g/L.
结论:
- 重新设计的DLA响应系统显著提高了L. bulgaricus的DLA产量.
- 该系统为精确控制微生物宿主中的代谢途径提供了宝贵的工具.
- 这些发现扩大了L. bulgaricus的分子克隆工具包,使未来的生物治疗和益生菌应用成为可能.
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