整合的基因组和转录基因组洞察力在Methylobacterium extorquens AM1中对甲醇耐受性机制,确定菌株工程的关键目标
Gyu Min Lee1, Khoi Nhat Pham1, Ina Bang1
1School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.
Journal of biological engineering
|December 8, 2025
概括
研究人员通过提高甲醇耐受性来增强Methylobacterium extorquens AM1的可持续生物制造. 适应性实验室进化发现了metY和kefB的关键突变,促进了增长率,并为工业应用提供了系统级的洞察力.
科学领域:
- 微生物生物技术 微生物生物技术
- 合成生物学 合成生物学
- 生物化学工程 生物化学工程
背景情况:
- 甲醇是生物制造的成本效益高的原料,但其细胞毒性限制了其在Methylobacterium extorquens AM1.1等本地甲基菌中的应用.
- 改善微生物宿主中的甲醇耐受性对于推进可持续生物制造工艺至关重要.
研究的目的:
- 开发Methylobacterium extorquens AM1菌株,对甲醇度升高的耐受性提高.
- 为了确定基因和转录性适应,从而提高甲醇耐受性.
- 为优化基于甲醇的生物制造提供系统层面的见解.
主要方法:
- 适应性实验室进化 (ALE) 用于产生耐甲醇菌株.
- 基因组分析发现了metY和kefB基因中的反复突变.
- 综合基因组和转录基因组分析阐明了适应机制和转录重编程.
主要成果:
- 进化菌株在高甲醇度下表现出高达1.68倍的特定生长率.
- 在metY (O-乙-L-同氨酸硫酸酶) 和kefB (排放反载体) 中发生的突变是复发性的,并改善了甲醇耐受性.
- 功能验证证实了metY和kefB突变在增强适应性方面的不同,互补的作用.
- 综合分析揭示了广泛的转录重编程,其中关键的基因在中央碳代谢,甲氨酸生物合成和减轻压力的上调.
结论:
- 协调的遗传和转录性适应,特别是在氨酸生物合成和节能途径中,显著提高了AM1衍生菌株的甲醇耐受性.
- 已识别的进化菌株是基于甲醇的生物制造的有希望的平台,提供了更好的微生物强度.
- 这项研究为工业生物工艺中的微生物适应策略提供了有价值的系统层面的见解.
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