Ontology type: schema:ScholarlyArticle
2019-03-22
AUTHORSYu Zhang, Yan-Feng Li, Zhe Chi, Guang-Lei Liu, Hong Jiang, Zhong Hu, Zhen-Ming Chi
ABSTRACTThis study aimed to overexpress an inulinase gene in Kluyveromyces marxianus to achieve the inulinase overproduction and preparation of ultra-high-fructose syrup. First, the inulinase gene (INU1 gene) was overexpressed through codon optimization and selection of a suitable promoter. Then, the inulinase was overproduced by high-cell-density fermentation. Finally, ultra-high-fructose syrup was prepared. It was found that optimization of the codons of the native INU1 gene encoding inulinase from Kluyveromyces marxianus KM-0 made a recombinant strain KM-N70 carrying the optimized INU1N gene produce 251.4 U/mL of the inulinase activity. Furthermore, inulinase activity produced by a recombinant KM-KN16 strain carrying the optimized INU1N gene directed by the native TPS1 promoter from K. marxianus KM-0 reached 338.5 U/mL and expression level of the optimized INU1N gene in the recombinant KM-KN16 strain was also greatly enhanced. During a 10-L fermentation, the recombinant KM-KN16 strain could produce 374.3 U/mL of inulinase activity within 24 h, while during a high-cell-density fed-batch fermentation, the recombinant KM-KN16 strain could produce 896.1 U/mL of inulinase activity and OD600nm value of its culture reached 108. The crude inulinase preparation obtained in this study had an inulinase activity of 18,699.8 ± 736.4 U/g of the crude preparation. It was found that 90.3% of 332.4 g/L of inulin was hydrolyzed to produce 41.0 g/L of glucose and 256.0 g/L of fructose and 91.1% of 328.2 g/L of inulin in the extract of the tubers of Jerusalem artichoke was hydrolyzed to produce 48.3 g/L of glucose and 250.5 g/L of fructose by the crude inulinase preparation (75 U/g of the substrate) within 8 h. The hydrolysates contained major monosaccharides and a trace amount of trisaccharides and the monosaccharides were composed of around 85% fructose and 15% glucose. So far, any other yeasts available have produced only up to 120 U/mL of inulinase activity. Together, this made the recombinant KM-KN16 strain be the best inulinase producer at this moment. The inulinase activity of 18,699.8 ± 736.4 U/g of the crude preparation and the ultra-high-fructose syrup with 41.0 g/L of glucose and 256.0 g/L of fructose were obtained. The inulinase activity obtained in this study was the highest among all the inulinase activities produced by yeast, fungal, and bacterial strains obtained so far. More... »
PAGES1-11
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