Chlorogenic acid(CGA)is a valuable phenolic acid with various pharmaceutical functions.In our previous study,de novo synthesis of CGA in Saccharomyces cerevisiae was achieved.However,its yield required improvement bef...Chlorogenic acid(CGA)is a valuable phenolic acid with various pharmaceutical functions.In our previous study,de novo synthesis of CGA in Saccharomyces cerevisiae was achieved.However,its yield required improvement before large scale production.In this study,systematic metabolic engineering strategy was used to reconstruct chassis cell S.cerevisiae YC0707 to enhance its CGA yield from glucose.To balance the supply of phospho-enolpyruvate(PEP)and erythrose 4-phosphate(E4P),ZWF1(encoding glucose-6-phosphate dehydrogenase)and GND1(encoding 6-phosphogluconate dehydrogenase)were overexpressed by strong promoter PTEF1 swapping,thereby strengthening the pentose phosphate pathway.The mutant of phosphofructokinase(PFK2S718D)was further introduced to weaken the glycolytic pathway.Then,the p-coumaric acid synthesis capacity was enhanced by employing tyrosine ammonia lyase from Rhodotorula glutinis(RgTAL),ΔHAM1,andΔYJL028W.Fusion expression of AtC4H(cinnamate-4-hydroxylase)and At4CL1(4-coumarate CoA ligase 1),together with CsHQT(hydroxycinnamoyl CoA quinate transferase)and AtC3′H(p-coumaroyl shikimate 3-hydroxylase),improved biosynthetic flux to CGA.Subsequently,the microenvironment of P450 enzymes was improved by overexpressing INO2(a transcription factor for lipid biosynthesis)and removal of heme oxygenase gene HMX1.Furthermore,screening potential transporters to facilitate CGA accumulation.Finally,we optimized the fermentation condi-tions.Using these strategies,CGA titers increased from 234.8 mg/L to 837.2 mg/L in shake flasks and reached 1.62 g/L in a 5-L bioreactor,representing the highest report in S.cerevisiae and providing new insights for CGA production.展开更多
基金supported by National Key Research and Development Program of China(2021YFA0909500)the National Natural Science Foundation of China(no.31970104).
文摘Chlorogenic acid(CGA)is a valuable phenolic acid with various pharmaceutical functions.In our previous study,de novo synthesis of CGA in Saccharomyces cerevisiae was achieved.However,its yield required improvement before large scale production.In this study,systematic metabolic engineering strategy was used to reconstruct chassis cell S.cerevisiae YC0707 to enhance its CGA yield from glucose.To balance the supply of phospho-enolpyruvate(PEP)and erythrose 4-phosphate(E4P),ZWF1(encoding glucose-6-phosphate dehydrogenase)and GND1(encoding 6-phosphogluconate dehydrogenase)were overexpressed by strong promoter PTEF1 swapping,thereby strengthening the pentose phosphate pathway.The mutant of phosphofructokinase(PFK2S718D)was further introduced to weaken the glycolytic pathway.Then,the p-coumaric acid synthesis capacity was enhanced by employing tyrosine ammonia lyase from Rhodotorula glutinis(RgTAL),ΔHAM1,andΔYJL028W.Fusion expression of AtC4H(cinnamate-4-hydroxylase)and At4CL1(4-coumarate CoA ligase 1),together with CsHQT(hydroxycinnamoyl CoA quinate transferase)and AtC3′H(p-coumaroyl shikimate 3-hydroxylase),improved biosynthetic flux to CGA.Subsequently,the microenvironment of P450 enzymes was improved by overexpressing INO2(a transcription factor for lipid biosynthesis)and removal of heme oxygenase gene HMX1.Furthermore,screening potential transporters to facilitate CGA accumulation.Finally,we optimized the fermentation condi-tions.Using these strategies,CGA titers increased from 234.8 mg/L to 837.2 mg/L in shake flasks and reached 1.62 g/L in a 5-L bioreactor,representing the highest report in S.cerevisiae and providing new insights for CGA production.
