天然产物研究与开发 ›› 2014, Vol. 26 ›› Issue (9): 1463-1468.

• 开发研究 • 上一篇    下一篇

条斑紫菜蛋白酶解产物中α-葡萄糖苷酶抑制剂纯化及特性

周锋,刘冬冬,周楠迪,田亚平*   

  1. 江南大学 工业生物技术教育部重点实验室,无锡214122
  • 出版日期:2014-09-30 发布日期:2014-11-02

Purification and Characterization of α-Glucosidase Inhibitor from Proteolytic Product of Porphyra yezoensis

ZHOU Feng, LIU Dong-dong, ZHOU Nan-di, TIAN Ya-ping*   

  1. Key Laboratory of Industrial Biotechnology,Ministry of Education,Jiangnan University,Wuxi 214122,China
  • Online:2014-09-30 Published:2014-11-02

摘要: 以α-葡萄糖苷酶抑制活性为指标,优选出1398中性蛋白酶、碱性蛋白酶和氨肽酶在一定条件下复配酶解条斑紫菜蛋白制备α-葡萄糖苷酶抑制剂。酶解液加入乙醇至终浓度为60%以沉淀去除多糖,上清液为α-葡萄糖苷酶抑制剂粗品。该粗品利用SP Sepharose High Performance阳离子交换层析、Sephadex G-10凝胶层析和Mono Q阴离子交换层析进行分离纯化,获得一种肽类α-葡萄糖苷酶抑制剂(LGI)。LGI经反向高效液相层析测定纯度为62.4%,基本特性分析显示其具较好的温度和pH稳定性,对α-葡萄糖苷酶半抑制浓度IC50值为97.36 μg/mL,属于一种非竞争性抑制剂。

关键词: 条斑紫菜, 蛋白酶水解, &alpha, -葡萄糖苷酶抑制剂, 纯化, 基本特性

Abstract: In this study,combined proteolyzation of Porphyra yezoensis by 1398 neutral protease,alkaline protease and aminopeptidase was optimized using the α-glucosidase inhibitor activity as index.The α-glucosidase inhibitor from hydrolysate was initially extracted by adding 60% ethanol to precipitate and remove polysaccharides.The supernatant was further purified through SP Sepharose High Performance cation-exchange chromatography,Sephadex G-10 gel filtration chromatography and Mono Q anion exchange chromatography.The purity of the obtained peptide-type α-glucosidase inhibitor (LGI) was up to 62.4%,according to the result of reverse-phase high performance liquid chromatography (RP-HPLC).The basic characteristics of LGI indicated that it had high thermo stability and pH stability.The IC50 value of LGI was 97.36 μg/mL against α-glucosidase,and it belonged to non-competitive inhibitors.

Key words: Porphyra yezoensis, protease hydrolysis, &alpha, -glucosidase inhibitor, purification, basic characteristics

中图分类号: 

Q946.1 TS254.9