Improved production of 2′-fucosyllactose in engineered Saccharomyces cerevisiae expressing a putative α-1, 2-fucosyltransferase from Bacillus cereus

Microbial Cell Factories

Weixin Zhang¹  Mingyuan Xu¹  Yu Shen¹  Xiangfeng Meng¹  Weifeng Liu¹ 

[1] State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, No.72 Binhai Road, 266237, Qingdao, People’s Republic of China;

关键词: 2′-fucosyllactose;    α-1, 2-fucosyltransferase;    Bacillus cereus;    Saccharomyces cerevisiae;    GDP--fucose;   

DOI  :  10.1186/s12934-021-01657-5

来源: Springer

【 摘 要 】

Background2′-fucosyllactose (2′-FL) is one of the most abundant oligosaccharides in human milk. It constitutes an authorized functional additive to improve infant nutrition and health in manufactured infant formulations. As a result, a cost-effective method for mass production of 2′-FL is highly desirable.ResultsA microbial cell factory for 2′-FL production was constructed in Saccharomyces cerevisiae by expressing a putative α-1, 2-fucosyltransferase from Bacillus cereus (FutBc) and enhancing the de novo GDP-l-fucose biosynthesis. When enabled lactose uptake, this system produced 2.54 g/L of 2′-FL with a batch flask cultivation using galactose as inducer and carbon source, representing a 1.8-fold increase compared with the commonly used α-1, 2-fucosyltransferase from Helicobacter pylori (FutC). The production of 2′-FL was further increased to 3.45 g/L by fortifying GDP-mannose synthesis. Further deleting gal80 enabled the engineered strain to produce 26.63 g/L of 2′-FL with a yield of 0.85 mol/mol from lactose with sucrose as a carbon source in a fed-batch fermentation.ConclusionFutBc combined with the other reported engineering strategies holds great potential for developing commercial scale processes for economic 2′-FL production using a food-grade microbial cell factory.

【 授权许可】

CC BY