食品科学 ›› 0, Vol. ›› Issue (): 0-0.

• 生物工程 •    下一篇

一株新的变形杆菌噬菌体的分离、鉴定与生物学特性分析

苏雅航1,侯忠余2,朱成林3,陈娟4,刀筱芳1,唐俊妮4   

  1. 1. 西南民族大学食品科学与技术学院
    2. 西南民族大学西南民族大学青藏高原研究院
    3. 四川农业大学
    4. 西南民族大学
  • 收稿日期:2022-10-03 修回日期:2023-06-04 出版日期:2023-09-25 发布日期:2023-09-29
  • 通讯作者: 唐俊妮 E-mail:junneytang@aliyun.com
  • 基金资助:
    西南民族大学中央高校基本科研业务费专项

Isolation, Identification and Biological Characteristics Analysis of a new Proteus Phage

1, 1, 1, 1, 1,Junni Tang   

  • Received:2022-10-03 Revised:2023-06-04 Online:2023-09-25 Published:2023-09-29
  • Contact: Junni Tang E-mail:junneytang@aliyun.com

摘要: 目的:一株新的变形杆菌噬菌体的分离、鉴定与生物学特性及基因组分析。方法:将实验室从牦牛屠宰环节中分离到的菌株纯培养后,对其DNA提取进行16S rRNA测序,鉴定获得宿主菌,采集成都牦牛屠宰场环境污水,以获得的宿主菌进行噬菌体分离;运用双层琼脂平板法进行噬菌体的分离纯化,测定噬菌体的最佳感染复数,一步生长曲线和噬菌体耐受性等;通过磷酸负染、透射电镜观察噬菌体的形态;采用试剂盒提取噬菌体全基因组DNA,使用Iumina Miseq测序平台进行噬菌体全基因组测序,对噬菌体全基因组序列进行组装、注释和基因组学分析。结果:从67株分离菌株中鉴定出10株变形杆菌,并从污水中分离得到一株可裂解变形杆菌和粪肠球菌并且裂解性较强的噬菌体,命名为Proteus phage PV66;其最佳感染复数为0.1,一步生长曲线结果显示,感染宿主菌的潜伏期约为10 min,裂解期约为80 min,平均裂解量为321 PFU/cell ;耐受pH范围为3-12,耐受温度为65 ℃。电镜观察该噬菌体为C3形态噬菌体,其头部长 (140±1) nm,宽 (54±2) nm,尾部长为(36±1)nm。基因组测序结果表明PV66全序列长度为90 492 bp,系统发育树分析发现该噬菌体与奇异变形杆菌噬菌体和克诺罗杆菌噬菌体同源性较高,与 Non-Kuravirus属处于同一分支。结论:本研究分离到一株新的变形杆菌噬菌体并具有良好的应用潜力,为进一步开发噬菌体类新型抗菌剂提供基础,同时本研究也丰富了变形杆菌噬菌体的数据库。

关键词: 变形杆菌, 噬菌体, 生物学特性, 基因组分析

Abstract: Objective To isolate, identify, characterize and analyze the genome of a new Proteus phage. Methods The strains isolated from yak slaughtering in the laboratory were cultured, their DNA was extracted and sequenced with 16S rRNA, and the host bacteria were identified. The environmental sewage of Chengdu Yak slaughterhouse was collected, and the host bacteria were used for bacteriophage separation; The bacteriophage was separated and purified by double agar plate method, and the optimal multiplicity of infection, one-step growth curve and bacteriophage tolerance were determined; The morphology of phage was observed by negative staining with phosphoric acid and transmission electron microscopy; The whole genome DNA of bacteriophage was extracted with the kit, and the whole genome of bacteriophage was sequenced using the Iumina Miseq sequencing platform. The whole genome sequence of bacteriophage was assembled, annotated, and genomically analyzed. Results 10 Proteus strains were identified from 67 isolates, and a phage with strong lytic activity, named Proteus phase PV66, was isolated from sewage; The optimal multiplicity of infection was 0.1. The results of one-step growth curve showed that the incubation period of the infected host bacteria was about 10 min, the lytic period was about 80 min, and the average lytic amount was 321 PFU/cell; The tolerance pH range is 3-12, and the tolerance temperature is 65 ℃. The bacteriophage was C3 shaped under electron microscope, with a head length of (140 ± 1) nm, a width of (54 ± 2) nm, and a tail length of (36 ± 1) nm. The genome sequencing results showed that the whole sequence length of PV66 was 90492 bp. Phylogenetic tree analysis showed that the phage had high homology with Proteus mirabilis phage and Cronobacter bacteriophage, and was in the same branch as Non-Kuravirus. Conclusion A new Proteus phage was isolated in this study and has good application potential, which provides a basis for further development of new bacteriophages. At the same time, this study also enriches the database of Proteus phages.

Key words: Proteus, Phage, Biological Characteristics, Genome Analysis

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