生物技术通报 ›› 2014, Vol. 0 ›› Issue (12): 168-172.doi: 10.13560/j.cnki.biotech.bull.1985.2014.12.028

• 研究报告 • 上一篇    下一篇

一株弗氏链霉菌噬菌体的分离及其分子特性研究

白宇, 徐春燕 ,苏建宇   

  1. 宁夏大学生命科学学院 西部特色生物资源保护与利用教育部重点实验室,银川 750021
  • 收稿日期:2014-04-25 出版日期:2014-12-08 发布日期:2014-12-12
  • 作者简介:白宇,女,硕士研究生,研究方向:微生物与基因工程;E-mail:baiyu1119@163.com

Identification and Molecular Characterization of a Phage from Streptomyces fradiae

Bai Yu, Xu Chunyan, Su Jianyu   

  1. (Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, School of Life Science, Ningxia University, Yinchuan 750021)
  • Received:2014-04-25 Published:2014-12-08 Online:2014-12-12

摘要: 鉴定一株从泰乐菌素异常发酵液中分离出的烈性噬菌体 SF1 并研究其分子特性。采用双层平板法分离纯化弗氏链 霉菌的噬菌体 SF1,通过负染法电镜观察噬菌体 SF1 的大小和形态 ;测定噬菌体 SF1 对氯仿和异丙醇的敏感性分析其包膜结构 ; 通过 SDS-PAGE 分析噬菌体的结构蛋白 ;提取噬菌体基因组 DNA 进行限制性片段长度多样性分析。噬菌体 SF1 的噬菌斑直径约 11-15 mm,边缘整齐透明,为烈性噬菌体;SF1 为长尾型,头部为多面体,直径约 24-30 nm,尾长约 52-64 nm,尾宽约为 3-5 nm;对氯仿和异丙醇不敏感,无包膜 ;基因组为双链 DNA,大小约为 35 kb ;至少含有 14 种相对分子量为 14.8-59.5 kD 的结构蛋白。

关键词: 弗氏链霉菌, 噬菌体, 泰乐菌素

Abstract: It was to identify and explore the molecular characterization of a phage SF1, which was isolated from Streptomyces fradiae fermentation broth during the failed industrial production of tylosin. Phage SF1 was characterized by observing the shape of plaque, titering on double-layer agar culture plate. The morphology of SF1 was observed by the electron microscopic observation after negative staining. The sensitivity of the phage to chloroform and isopropyl alcohol was tested to detect its envelope. The structural proteins analysis of phage SF1 was carried out by SDS-PAGE. Restriction fragment length polymorphism(RFLP)analysis of genomic DNA was further performed to characterize the phage. Results showed that the plaque(11-15 mm in diameter)is neat and transparent. SF1 has a polyhedral head(about 24-30 nm in diameter)and a long tail(about 52-64 nm long and 3-5 nm wide). It is insensitive to chloroform and isopropyl alcohol. The genome of SF1 consists of double-stranded DNA and is approximately 35 kb. Capsid protein analysis shows a higher level of 14 major protein bands ranging from 14.8-59.5 kD, which is presumed to be the structural proteins of SF1.

Key words: Streptomyces fradiae, Phage, Tylosin