首页> 外文期刊>Applied Microbiology >Improvement of Glucose Uptake Rate and Production of Target Chemicals by Overexpressing Hexose Transporters and Transcriptional Activator Gcr1 in Saccharomyces cerevisiae
【24h】

Improvement of Glucose Uptake Rate and Production of Target Chemicals by Overexpressing Hexose Transporters and Transcriptional Activator Gcr1 in Saccharomyces cerevisiae

机译:通过过量表达己糖转运蛋白和转录激活因子Gcr1在酿酒酵母中提高葡萄糖吸收速率和目标化学药品的生产

获取原文
           

摘要

Metabolic engineering to increase the glucose uptake rate might be beneficial to improve microbial production of various fuels and chemicals. In this study, we enhanced the glucose uptake rate in Saccharomyces cerevisiae by overexpressing hexose transporters (HXTs). Among the 5 tested HXTs (Hxt1, Hxt2, Hxt3, Hxt4, and Hxt7), overexpression of high-affinity transporter Hxt7 was the most effective in increasing the glucose uptake rate, followed by moderate-affinity transporters Hxt2 and Hxt4. Deletion of STD1 and MTH1 , encoding corepressors of HXT genes, exerted differential effects on the glucose uptake rate, depending on the culture conditions. In addition, improved cell growth and glucose uptake rates could be achieved by overexpression of GCR1 , which led to increased transcription levels of HXT1 and ribosomal protein genes. All genetic modifications enhancing the glucose uptake rate also increased the ethanol production rate in wild-type S. cerevisiae . Furthermore, the growth-promoting effect of GCR1 overexpression was successfully applied to lactic acid production in an engineered lactic acid-producing strain, resulting in a significant improvement of productivity and titers of lactic acid production under acidic fermentation conditions.
机译:代谢工程以增加葡萄糖的摄取速率可能有益于改善各种燃料和化学物质的微生物产生。在这项研究中,我们通过过量表达己糖转运蛋白(HXTs)来提高酿酒酵母中的葡萄糖摄取率。在5个测试的HXT(Hxt1,Hxt2,Hxt3,Hxt4和Hxt7)中,高亲和力转运蛋白Hxt7的过表达最有效地增加了葡萄糖的摄取率,其次是中亲和力转运蛋白Hxt2和Hxt4。根据培养条件的不同,编码HXT基因的共加压子的STD1和MTH1的缺失对葡萄糖的摄取速率产生不同的影响。此外,GCR1的过表达可以提高细胞的生长和葡萄糖摄取率,从而导致HXT1和核糖体蛋白基因的转录水平增加。在野生型酿酒酵母中,所有提高葡萄糖吸收率的遗传修饰也提高了乙醇的产生率。此外,GCR1过表达的生长促进作用已成功应用于工程化乳酸生产菌株中的乳酸生产,从而在酸性发酵条件下显着提高了生产率和乳酸生产的效价。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号