食品科学 ›› 2009, Vol. 30 ›› Issue (11): 185-188.doi: 10.7506/spkx1002-6630-200911041

• 生物工程 • 上一篇    下一篇

市售酸乳中嗜热链球菌的分离及RAPD分析

刘 鑫1,马成杰1 ,2,杨双熙1,杜昭平1,马爱民1 ,*   

  1. (1.华中农业大学食品科技学院,湖北 武汉 430070;2.光明乳业技术中心武汉研究所,湖北 武汉 430040)
  • 收稿日期:2008-10-10 修回日期:2009-01-12 出版日期:2009-06-01 发布日期:2010-12-29
  • 通讯作者: 马爱民 E-mail:aiminma@mail.hzau.edu.cn
  • 基金资助:

    “十一五”国家科技支撑计划项目(2006BAD04A14)

Isolation and Identification of High-yield Melanin-producing Actinomycetes G-HD-4

LIU Xin1,MA Cheng-jie1,2,YANG Shuang-xi1,DU Zhao-ping1,MA Ai-min1,*   

  1. (1.College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China;
    2.Wuhan Research Institute, Bright Dairy and Food Co. Ltd., Wuhan 430040, China)
  • Received:2008-10-10 Revised:2009-01-12 Online:2009-06-01 Published:2010-12-29
  • Contact: MA Ai-min1,* E-mail:aiminma@mail.hzau.edu.cn

摘要:

本研究采用选择性培养基,通过划线分离、显微观察及糖发酵实验,从市售酸乳中获得嗜热链球菌(Streptococcus thermophilus)8 株。采用23 个随机引物,分别对分离的8 个嗜热链球菌菌株进行RAPD 扩增,再运用NTSYSpc-2.10e 软件,对所得扩增产物进行统计处理,得出8 株嗜热链球菌之间的遗传相似系数矩阵和聚类分析图。结果表明,8 个菌株相互间的遗传相似系数在0.4886~0.9313 之间。当相似系数为0.6489 时,S.t1、S.t3、S.t4、S.t5、S.t6、S.t7 聚为一组,S.t2、S.t8 聚为另一组;相似系数达到0.6947 时,前者又聚为2 个亚组,其中S.t1 和S.t7 为一亚组,而S.t3、S.t4、S.t5、S.t6 为另一亚组。

关键词: 嗜热链球菌, RAPD, 聚类分析

Abstract:

Actinomyceter strain G-HD-4 was isolated from soil sample collected from Huaqiao flower garden in Quanzhou of Fujian Province, which produced the most melanin compared to other isolated 18 strains. The melanin separated from the fermentation broth of strain G-HD-4 was characterized by ultraviolet-visible (UV-Vis) spectroscopy, infrared (IR) spectroscopy, and scanning electron microscope (SEM). The results revealed that the melanin derived from strain G-HD-4 was similar to standard melanin on the structural basis. Based on the studies of physiological and biochemical characteristics and 16S ribosomal RNA sequence homology, the G-HD-4 strain was confirmed to belong to Streptomyces genus and be similar to Streptomyces capoamus (gene sequence similarity 99%). Finally, it was identified as a species of Streptomyces capoamus by taxonomic and phylogentic analysis.

Key words: Streptomycs G-HD-4, melanin, 16S rDNA sequence, phylogenetic analysis

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