适应性进化和机制阐明用于以粉为基础的生物炼油厂中使用的耐乙醇的Saccharomyces cerevisiae
Zhaoxian Xu1, Yuanyuan Sha1, Muzi Li1
1School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; Biorefinery Research Institution, Nanjing University of Science and Technology, Nanjing 210094, China.
International journal of biological macromolecules
|November 29, 2024
概括
开发耐乙醇的Saccharomyces cerevisiae对于生物炼油厂至关重要. 适应性进化成功地创造了一种优越的菌株,提高了葡萄糖消耗和玉米和麻瓜的乙醇生产,即使在高度下也是如此.
科学领域:
- 生物技术是生物技术.
- 微生物学 微生物学
- 代谢工程是代谢工程.
背景情况:
- 通过发酵生产乙醇严重依赖于Saccharomyces cerevisiae.
- 高重力发酵和基于粉的原料由于乙醇毒性而带来了挑战.
- 开发强大的酵母菌株对于高效的生物提炼至关重要.
研究的目的:
- 通过适应性进化增强Saccharomyces cerevisiae中的乙醇耐受性.
- 在高重力发酵条件下改善葡萄糖消耗和乙醇产量.
- 确定导致乙醇耐受性升高的遗传因素.
主要方法:
- 适应性进化使用不断增加的乙醇度作为选择性压力.
- 使用玉米和麻豆在各种固体负载下进行高重力发酵试验.
- 进化菌株的基因组重新排序以确定突变.
- 候选基因的功能分析,包括PAM1.
主要成果:
- 一种进化的Saccharomyces cerevisiae菌株表现出显著改善的乙醇耐受性.
- 这种进化的菌株表现出增强的葡萄糖消耗和乙醇生产,最初的葡萄糖量为300g/L.
- 在高固体负载 (高达40重%) 的玉米和 (高达33重%) 的麻豆中观察到更优异的性能.
- 基因组分析显示了205个基因中的504个突变,其中PAM1被确定为增强耐受性的关键贡献者.
结论:
- 适应性进化是开发高性能乙醇耐受性酵母的有效策略.
- 在Saccharomyces cerevisiae的乙醇耐受性机制中,PAM1基因起着重要的作用.
- 这项研究为合理的代谢工程提供了基础,以进一步优化工业乙醇生产的酵母菌株.
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