食品科学 ›› 2011, Vol. 32 ›› Issue (1 ): 199-202.doi: 10.7506/spkx1002-6630-201101047

• 生物工程 • 上一篇    下一篇

地衣芽孢杆菌A 产碱性蛋白酶的研究

张文杰,高翔,孙 静,姜李雁,丁进锋,岳福鹏,苏秀榕*   

  1. 1. 宁波大学生命科学与生物工程学院
  • 收稿日期:2010-09-30 修回日期:2010-12-20 出版日期:2011-01-15 发布日期:2010-12-28
  • 通讯作者: 苏秀榕 E-mail:suxiurong@nbu.edu.cn
  • 基金资助:

    浙江省重大科技攻关项目(2009C03017-1)

Study on Alkaline Protease from Bacillus licheniformis A

ZHANG Wen-jie,GAO Xiang,SUN Jing,JIANG Li-yan,DING Jin-feng,YUE Fu-peng,SU Xiu-rong*   

  1. Faculty of Life Science and Biotechnology, Ningbo University, Ningbo 315211, China
  • Received:2010-09-30 Revised:2010-12-20 Online:2011-01-15 Published:2010-12-28
  • Contact: SU Xiu-rong E-mail:suxiurong@nbu.edu.cn

摘要:

研究从经过60Co 照射的东海香参水解液中分离出的地衣芽孢杆菌A 产碱性蛋白酶的产率、分离纯化与生化特性。经硫酸铵沉淀、DEAE- Sepharose 离子交换层析和Sephadex G-75 凝胶层析分离纯化后,碱性蛋白酶产率为5.8%;经SDS- PAGE 电泳测得其分子质量为35kD。酶的最适反应温度为50℃,最适pH 值为11,热稳定性较好。该蛋白酶具有一定的耐氧化能力。

关键词: 地衣芽孢杆菌A, 碱性蛋白酶, 分离纯化

Abstract:

The alkaline protease produced by the fermentation of Bacillus licheniformis A, a strain isolated from the hydrolysate of 60Co-irradiated Acaudina leucoprocta was salted out from the fermentation supernatant with ammonium sulfate. After DEAESepharose ion exchange chromatographic separation and subsequent Sephadex G-75 gel permeation chromatographic purification, an alkaline protease yield of 5.8% was achieved. The alkaline protease was determined by SDS-PAGE to have a molecular weight of 35 kD. The optimal reaction temperature and pH of the enzyme were 50 ℃ and 11, respectively. The enzyme had perfect thermostability and a certain level of resistance to oxidation.

Key words: Bacillus licheniformis A, alkaline protease, isolation and purification

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