菊芋
菊粉
解淀粉芽孢杆菌
食品科学
化学
透明质酸
发酵
多糖
生物化学
生物合成
生物技术
生物
酶
遗传学
作者
Yanqin Ma,Yibin Qiu,Caiyuan Yu,Sha Li,Hong Xu
标识
DOI:10.1016/j.ijbiomac.2022.02.100
摘要
Hyaluronic acid (HA), a high-value biomacromolecule, has wide applications in medical, cosmetic and food fields. Currently, employing the safe-grade microorganisms for de novo biosynthesis of HA from renewable substrates has become a promising alternative. In this study, we established a Bacillus amyloliquefaciens strain as platform for HA production from Jerusalem artichoke inulin. Firstly, the different HA and UDP-GlcUA synthase genes were introduced into B. amyloliquefaciens to construct the HA synthesis pathway. Secondly, the byproduct polysaccharides were removed by knocking sacB and epsA-O using CRISPR/Cas9n system, resulting in a 13% increase in HA production. Finally, 2.89 g/L HA with a high molecular weight of 1.5 MDa was obtained after optimizing fermentation conditions and adding osmotic agents. This study demonstrates the engineered B. amyloliquefaciens can effectively synthesize HA with Jerusalem artichoke inulin and provides a green route for HA production.
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