两种NADPH依赖的2 - 基酸盐还原酶参与了2 - 基酸盐在Gluconobacter sp.中的同化. 这种菌株是CHM43的
Sakura Nakashima1, Minenosuke Matsutani2, Naoya Kataoka3,4,5
1Joint Degree Program of Kasetsart University and Yamaguchi University, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, Japan.
Applied and environmental microbiology
|January 29, 2025
概括
在Gluconobacter sp.中,有两种2 - 基托 - D - 葡萄糖酸盐还原酶 (2KGR). 菌株CHM43对于代谢2-基托-D-葡萄酸盐 (2KG) 是必不可少的. 删除这两种基因可以防止2KG的消耗,从而确定2KGR是该途径中的关键酶.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 代谢工程是代谢工程.
背景情况:
- 葡萄糖菌 sp. 的存在. 菌株CHM43不完全氧化葡萄糖,产生葡萄糖酸,随后产生2或5基糖酸 (2KG).
- 2KG是一种有价值的化合物,但也通过未知的代谢途径被Gluconobacter消耗.
- 虽然一些细菌酸化2KG,但其他细菌,如大肠杆菌,减少它,表明不同的代谢路径.
研究的目的:
- 识别和描述Gluconobacter sp.中负责2KG代谢的关键酶. 这种菌株是CHM43.
- 调查2KG消费中2--D-葡萄酸盐还原酶 (2KGR) 的作用.
- 为改善生物2KG生产系统提供见解.
主要方法:
- 基因组分析以识别可能的2KGR编码基因 (GLF_0478和GLF_1777).
- 构建Gluconobacter sp.的突变菌株的方法 菌株CHM43缺少一个或两个已识别的基因.
- 在野生型和突变菌株中测定2KG消耗能力和2KGR活性.
- 酶表征包括pH最佳值和基质亲和力 (Km为NADPH/NADH).
主要成果:
- 一个缺少GLF_0478和GLF_1777的双删除突变 (∆∆) 完全失去了消耗2KG的能力,同时仍然产生它.
- 单删除突变体显示2KGR活性降低,双突变体显示没有可检测的活性,确认GLF_0478和GLF_1777是主要的2KGRs.
- 已识别的2KGRs在中性pH下表现出最佳活性,并更喜欢NADPH而不是NADH,具有2KG可诱导的特定表达模式.
结论:
- 由GLF_0478和GLF_1777催化的2KG的减少代表了Gluconobacter sp.在2KG代谢中的承诺步骤. 这种菌株是CHM43.
- 了解这些2KGR为旨在增强2KG生产的代谢工程策略提供了关键信息.
- 这项研究阐明了一条关键的代谢途径,有助于更广泛地了解微生物代谢和工业生物技术.
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