食品科学

• 生物工程 • 上一篇    下一篇

短短芽孢杆菌几丁质酶的分离纯化及酶学性质

苏明慧,胡雪芹*,顾东华,张洪斌,褚小龙   

  1. 合肥工业大学医学工程学院,安徽 合肥 230009
  • 出版日期:2015-10-15 发布日期:2015-10-20

Purification and Characterization of Chitinase from the Fermentation Broth of Brevibacillus brevis FM4B

SU Minghui, HU Xueqin*, GU Donghua, ZHANG Hongbin, CHU Xiaolong   

  1. School of Medical Engineering, Hefei University of Technology, Hefei 230009, China
  • Online:2015-10-15 Published:2015-10-20

摘要:

探讨来源于短短芽孢杆菌FM4B的几丁质酶(chitinase)分离纯化过程及其性质。菌株FM4B摇瓶发酵液经过离心、乙醇分级沉淀及葡聚糖凝胶G-100层析纯化,用变性聚丙烯酰胺凝胶电泳确定其分子质量。结果获得几丁质酶纯品,酶的纯化倍数为7.19,酶活回收率为30.6%,分子质量为66 kD;酶活力在pH 5.0~9.0和80 ℃以下稳定,最适pH值为6.0,最适温度为50 ℃;Cu2+、Hg2+、Pb2+、Co2+以及Zn2+对该酶有强烈的抑制作用,Mg2+ 和Ca2+对该酶的活力具有一定的促进作用;该几丁质酶对多种霉菌有显著的抑菌效果。菌株FM4B分泌的几丁质酶稳定性好,且对多种霉菌抑制效果明显,具有较高的潜在利用价值。

关键词: 短短芽孢杆菌, 几丁质酶, 纯化, 性质, 抑菌

Abstract:

In the present study, the purification and characterization of a chitinase from the fermentation broth of
Brevibacillus brevis FM4B was investigated by centrifugation, ethanol precipitation and Sephadex G-100 chromatography.
Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) was used to determine its molecular weight.
Purified chitinase with a purification factor of 7.19 and a recovery rate of 30.6% was obtained. The molecular weight of the
purified chitinase was approximately 66 kD. It had an optimum reaction temperature and pH of 50 ℃ and 6.0, respectively.
The enzyme also showed good stability in the pH range of 5.0–9.0. Its activity could be inhibited by Cu2+, Hg2+, Pb2+,
Co2+and Zn2+, but slightly activated by Mg2+ and Ca2+. In addition, the chitinase had obvious inhibitory effect on
different fungi. The chitinase, possessing high thermal stability, good pH adaptability and significant antifungal effect, has
great potential for practical applications.

Key words: Brevibacillus brevis, chitinase, purification, characterization, antibacterial activity

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