|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|6452315||1417010||2016||23 صفحه PDF||سفارش دهید||دانلود رایگان|
- Human milk oligosaccharides are important ingredients for health-related nutrition.
- Their production via multistep enzymatic cascades and using whole cells is reviewed.
- Recombinant production and properties of prokaryotic fucosyltransferases are summarized.
- Enzymatic fucosylation integrated with metabolism for GDP-l-fucose supply is described.
- Current bottlenecks of fucosylated HMO production are discussed.
Human milk oligosaccharides (HMOs) constitute a class of complex carbohydrates unique to mother's milk and are strongly correlated to the health benefits of breastfeeding in infants. HMOs are important as functional ingredients of advanced infant formula and have attracted broad interest for use in health-related human nutrition. About 50% of the HMOs structures contain l-fucosyl residues, which are introduced into nascent oligosaccharides by enzymatic transfer from GDP-l-fucose. To overcome limitation in the current availability of fucosylated HMOs, biotechnological approaches for their production have been developed. Functional expression of the fucosyltransferase(s) and effective supply of GDP-l-fucose, respectively, are both bottlenecks of the biocatalytic routes of synthesis. Strategies of in vitro and in vivo production of fucosylated HMOs are reviewed here. Besides metabolic engineering for enhanced HMO production in whole cells, the focus is on the characteristics and the heterologous overexpression of prokaryotic Î±1,2- and Î±1,3/4-fucosyltransferases. Up to 20Â g/L of fucosylated HMOs were obtained in optimized production systems. Optimized expression enabled recovery of purified fucosyltransferases in a yield of up to 45Â mg/L culture for Î±1,2-fucosyltransferases and of up to 200Â mg protein/L culture for Î±1,3/4-fucosyltransferases.
Journal: Journal of Biotechnology - Volume 235, 10 October 2016, Pages 61-83