食品科学 ›› 2021, Vol. 42 ›› Issue (8): 98-105.doi: 10.7506/spkx1002-6630-20200819-248

• 生物工程 • 上一篇    下一篇

产黄青霉β-甘露聚糖酶的高效表达、性质及应用

甄红敏,华晓晗,马俊文,温永平,李延啸,闫巧娟,江正强   

  1. (1.中国农业大学食品科学与营养工程学院,北京 100083;2.中国农业大学工学院,北京 100083;3.蒙牛高科乳制品(北京)有限责任公司,北京 100101)
  • 出版日期:2021-04-25 发布日期:2021-05-14
  • 基金资助:
    国家自然科学基金青年科学基金项目(31901627);中国博士后科学基金面上项目(2018M641539)

High-level Expression, Characterization, and Application of a Novel β-Mannanase from Penicillium chrysogenum

ZHEN Hongmin, HUA Xiaohan, MA Junwen, WEN Yongping, LI Yanxiao, YAN Qiaojuan, JIANG Zhengqiang   

  1. (1. College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; 2. College of Engineering, China Agricultural University, Beijing 100083, China; 3. Meng Niu Hi-Tech Dairy (Beijing) Co. Ltd., Beijing 100101, China)
  • Online:2021-04-25 Published:2021-05-14

摘要: 将产黄青霉(Penicillium chrysogenum)来源的β-甘露聚糖酶(PcMan26A)在毕赤酵母中高效表达,经高密度发酵,发酵液酶活力达25 200 U/mL。该酶属于GH26家族,与黑曲霉(Aspergillus niger)CBS 513.88来源的β-甘露聚糖酶同源性最高(67.8%),是一个新型β-甘露聚糖酶。PcMan26A的最适催化条件为pH 6.0和50?℃,在pH?4.0~8.0和45?℃下具有良好的稳定性。该酶对魔芋粉具有最高的比活力,为3?581.0?U/mg。进一步利用该酶水解魔芋粉得到魔芋甘露寡糖,产品得率为86.2%;经分析,其主要组分为聚合度大于4的甘露寡糖。该β-甘露聚糖酶适用于生产魔芋甘露寡糖,为魔芋甘露寡糖的酶法生产提供了更多的选择。

关键词: 产黄青霉;β-甘露聚糖酶;毕赤酵母;魔芋粉;甘露寡糖

Abstract: A cloned β-mannanase (PcMan26A) gene from Penicillium chrysogenum was successfully expressed in Penicillium chrysogenum. At the end of high cell density fermentation, the enzymatic activity of the fermentation supernatant reached 25 200 U/mL. The enzyme belonged to the glycoside hydrolase family 26 and shared the highest amino acid sequence identity (67.8%) with β-mannanase from Aspergillus niger CBS 513.88. The optimal reaction conditions for PcMan26A were pH 6.0 and 50 ℃, and it was stable at 45 ℃ and within a broad pH range of 4.0–8.0. The enzyme showed the highest specific activity (3 581.0 U/mg) towards konjac powder. Furthermore, PcMan26A was used for konjac powder hydrolysis, yielding konjac manno-oligosaccharide with a yield of 86.2%. The main composition of the konjac manno-oligosaccharide was manno-oligosaccharides with degree of polymerization > 4. The recombinant β-mannanase provides a new option for the enzymatic production of konjac manno-oligosaccharide.

Key words: Penicillium chrysogenum; β-mannanase; Pichia pastoris; konjac powder; manno-oligosaccharide

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