在工程Corynebacterium glutamicum中以高标位可持续生产2,3,5,6-四甲基pyrazine
Aparajitha Srinivasan1,2, Kevin Chen-Xiao1,2, Deepanwita Banerjee1,2
1Joint BioEnergy Institute, Emeryville, CA 94608, USA.
Journal of industrial microbiology & biotechnology
|July 16, 2024
概括
经过代谢工程的Corynebacterium glutamicum可以产生2,3,5,6-四甲基甲 (TMP),一种有价值的化学物质. 在生长介质中优化葡萄糖和尿素显著提高了TMP的产量,超过四倍.
科学领域:
- 生物技术是生物技术.
- 代谢工程是代谢工程.
- 工业微生物学 工业微生物学
背景情况:
- 谷氨酸菌 (Corynebacterium glutamicum) 是一种重要的工业微生物,用于氨基酸生产.
- 在自然界中,C. glutamicum在低水平上产生2,3,5,6-四甲基酸 (TMP).
- TMP是一种有价值的化合物,用于调味品,香料以及作为商品化学品.
研究的目的:
- 为了改造C. glutamicum以提高2,3,5,6-tetramethylpyrazine (TMP) 的产量.
- 优化介质组件以最大限度地提高TMP产量和标位.
- 用生物质衍生水解剂来评估TMP生产.
主要方法:
- 通过过度表达来自Lactococcus lactis的特定酶,对C. glutamicum进行代谢工程.
- 在定义的CGXII最小介质上种植,并补充葡萄糖和/或生物质水解剂.
- 实验设计 (DOE) 和响应表面方法 (RSM) 的应用,以优化介质.
主要成果:
- 在工程C. glutamicum菌株中达到TMP标位大约0.8g L-1.
- 通过使用离子液体预处理的 Sorghum 生物质水解剂证明了成功的 TMP 生产.
- 优化介质成分 (葡萄糖和尿素) 导致TMP标位增加4倍 (高达3.56g L-1),产量增加2倍.
结论:
- 代谢工程和媒介优化是C. glutamicum中高位数TMP生产的有效策略.
- 这种工程菌株显示出利用可持续的生物质原料的潜力.
- 进一步优化发酵参数可以导致这种有价值的化学物质的产量更高.
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