在amycolatopsis菌株中,shikimate通路的代谢工程用于优化糖抗生素生产
Valentina Goldfinger1, Marius Spohn1, Jens-Peter Rodler2
1Interfaculty Institute of Microbiology and Infection Medicine Tübingen, Microbiology/Biotechnology, University of Tübingen, Auf der Morgenstelle 28, 72076, Tübingen, Germany.
Metabolic engineering
|May 27, 2023
概括
控制糖抗生素 (GPA) 生产中的shikimate通路是关键. 在Amycolatopsis balhimycina中过度表达特定的酶显著提高了巴尔希米产量,证明了可行的代谢工程策略.
科学领域:
- 微生物生物技术 微生物生物技术
- 代谢工程是代谢工程.
- 自然产品生物合成 自然产品生物合成
背景情况:
- 葡萄糖抗生素 (GPAs) 是由石基胺途径衍生而来的复杂分子.
- 石基胺通路受到严格监管,这给GPA生产中的前体供应带来了挑战.
- 艾米科拉托普西斯 (amycolatopsis balhimycina) 产生了GPA的巴尔希米辛,作为研究前体控制的模型.
研究的目的:
- 为了研究GPA产生的微生物如何控制从shikimate通路的前体输送.
- 确定用于代谢工程的关键酶,以提高GPA产量.
- 评估在其他GPA生产商中确定策略的适用性.
主要方法:
- 在Amycolatopsis balhimycina中对关键的石基酸盐通路酶 (Dahp,Pdh) 的分析.
- 针对集群特异性和核心基因组酶的基因过度表达研究.
- 对全酶抑制和途径交叉调节的研究.
- 将成功的策略应用于对日本 Amycolatopsis japonicum 进行Ristomycin A 生产.
主要成果:
- 过度表达集群特异性去氧化-d-阿拉比诺-赫普酸-7-酸盐合成酶 (Dahpsec) 显著增加了巴尔希米辛产量 (>4倍).
- 前酸脱酶 (Pdh) 基因的过度表达并没有改善产量.
- 预脱水酶 (Pdt) 被确定为潜在的目标,其过度表达也会增加抗生素的生产.
- 这一策略成功地提高了Amycolatopsis japonicum中的Ristomycin A产量.
结论:
- 在石基胺通路内准特定的酶,如Dahpsec和Pdt,对于优化GPA前体供应至关重要.
- 了解酶调节和代谢途径之间的交叉对话对于有效的代谢工程至关重要.
- 考虑抗生素组装和前体供应的整体方法对于提高GPA生产产量至关重要.
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