华南理工大学学报(自然科学版) ›› 2012, Vol. 40 ›› Issue (5): 107-114.

• 生物工程 • 上一篇    下一篇

蛹虫草发酵产物新纤溶酶的分离纯化

刘晓兰 张雯舒 郑喜群 沈媛 孙莹   

  1. 齐齐哈尔大学 农产品加工黑龙省普通高校重点实验室,黑龙江 齐齐哈尔 161006
  • 收稿日期:2011-12-05 修回日期:2012-02-27 出版日期:2012-05-25 发布日期:2012-03-31
  • 通信作者: 刘晓兰(1962-) ,女,博士,教授,主要从事发酵工程与应用酶学研究. E-mail:liuxiaolan001@126.com
  • 作者简介:刘晓兰(1962-) ,女,博士,教授,主要从事发酵工程与应用酶学研究.
  • 基金资助:

    国家自然科学基金资助项目( 31171744) ; 齐齐哈尔大学创新科研项目( YJSCX2010-009X)

Isolation and Purification of Novel Fibrinolytic Enzymes Obtained from Fermentation of Cordyceps militaris

Liu Xiao-lan  Zhang Wen-shu  Zheng Xi-qun  Shen Yuan  Sun Ying   

  1. The Ordinary University Key Laboratory of Agricultural Products Processing,Qiqihar University,Qiqihar 161006,Heilongjiang,China
  • Received:2011-12-05 Revised:2012-02-27 Online:2012-05-25 Published:2012-03-31
  • Contact: 刘晓兰(1962-) ,女,博士,教授,主要从事发酵工程与应用酶学研究. E-mail:liuxiaolan001@126.com
  • About author:刘晓兰(1962-) ,女,博士,教授,主要从事发酵工程与应用酶学研究.
  • Supported by:

    国家自然科学基金资助项目( 31171744) ; 齐齐哈尔大学创新科研项目( YJSCX2010-009X)

摘要: 笔者所在项目组的前期研究发现,蛹虫草深层培养可以产生至少两种纤溶酶. 基于此,文中对蛹虫草深层培养产生的纤溶酶的分离纯化展开了研究.采用硫酸铵盐析、Sephadex G-25 凝胶色谱、Phenyl-Sepharose HP 疏水相互作用色谱、CM-Sepharose FF 弱阳离子交换色谱和Superdex 75 凝胶色谱对纤溶酶进行分离.最终纯化后的纤溶酶Ⅰ比活力达1467.44 U/mg,纯化倍数为36.07,回收率为5.79%. 纤溶酶Ⅱ比活力达1 681.58 U/mg,纯化倍数为41.33,回收率为4.00%.两种纤溶酶经电泳鉴定均达到电泳纯,相对分子质量分别约为28000 和32000.

关键词: 蛹虫草, 深层培养, 纤溶酶, 纯化, 色谱分离

Abstract:

In their earlier research,the authors have found that at least two kinds of fibrinolytic enzymes can be obtained from the submerged culture of Cordyceps militaris. As a further research,this paper deals with the isolation and purification of these fibrinolytic enzymes by means of ammonium sulfate precipitation,Sephadex G-25 gel filtration chromatography,Phenyl-Sepharose HP hydrophobic interaction chromatography,CM-Sepharose FF weak-cation exchange chromatography and Superdex 75 gel filtration chromatography. After the purification,two kinds of fibrinolytic enzymes are obtained,namely fibrinolytic enzyme I with a specific activity of 1467.44U/mg,a purification fold of 36.07 and a recovery of 5.79%,as well as fibrinolytic enzyme II with a specific activity of 1681.58U/mg,a purification fold of 41.33 and a recovery of 4.00%. SDS-PAGE results indicate that the two kinds of fibrinolytic enzymes,whose relative molecular mass are respectively about 28000 and 32000,are both electrophoretic pure.

Key words: Cordyceps militaris, submerged culture, fibrinolytic enzyme, purification, chromatographic separation