食品科学 ›› 2012, Vol. 33 ›› Issue (21): 221-225.

• 生物工程 • 上一篇    下一篇

海洋假单胞菌GY-1菌株的抗菌作用及其胞外抗菌蛋白的分离纯化

王淑芳,暴增海,马桂珍,葛平华,吴少杰,付泓润   

  1. 淮海工学院海洋学院
  • 收稿日期:2012-06-29 修回日期:2012-10-10 出版日期:2012-11-15 发布日期:2012-11-09
  • 通讯作者: 马桂珍 E-mail:guizhenma@sohu.com
  • 基金资助:

    江苏省企业博士集聚计划项目

Antifungal Activity of Marine Pseudomonas GY-1 and Purification of the Antifungal Protein

  • Received:2012-06-29 Revised:2012-10-10 Online:2012-11-15 Published:2012-11-09
  • Contact: MA Gui-Zhen E-mail:guizhenma@sohu.com

摘要: 采用对峙培养法和牛津杯法测定海洋假单胞杆菌(Pseudomonas) GY-1菌株和发酵液的抑菌作用。结果表明:GY-1菌株和发酵液对小麦根腐病菌(Bipolaris sorokiniana)、禾谷镰刀病菌(Fusarium graminearum)、菠菜早疫病菌(Alternaria solania)、斑点落叶病菌(Alternaria alternata)、油菜菌核病菌(Sclerotinia sclerotiorum)和小麦叶枯病菌(Alternaria tenuis Nees)等植物病原真菌有较强的抑制作用。发酵液采用硫酸铵分级沉淀、DEAE Sepharose Fast Flow柱层析、Sephadex G-75凝胶层析,以小麦根腐病菌为指示菌进行活性追踪和SDS-PAGE电泳纯度跟踪检测,纯化出一种对小麦根腐病菌具有明显抗菌作用的抗菌蛋白,其分子质量约为70.9kD。

关键词: 海洋假单胞杆菌GY-1菌株, 抗菌作用, 抗菌蛋白, 分离纯化

Abstract: In the present study, agar-well diffusion method and Oxford Cup method were used to detect the antimicrobial activities of marine Pseudomonas GY-1 strain. The results showed that GY-1 strain and its fermentation broth had relatively strong inhibition activity against a variety of phytopathogenic fungi, including Bipolaris sorokiniana, Fusarium graminearum, Alternaria solania, Alternaria alternate, Sclerotinia sclerotiorum and Alternaria tenuis Nees. Further study had successfully purified a protein from Pseudomonas GY-1 by ammonium sulfate fractional precipitation, DEAE sepharose fast flow ion exchange chromatography and Sephadex G-75 filtration chromatography. This protein showed obvious inhibition activity against B. sorokiniana. SDS-PAGE analysis revealed that the molecular weight of the protein was about 70.9 kD.

Key words: marine Pseudomonas GY-1, antifungal activity, antifungal protein, isolation and purification

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