食品科学 ›› 2022, Vol. 43 ›› Issue (8): 113-120.doi: 10.7506/spkx1002-6630-20210510-098

• 生物工程 • 上一篇    

1 株金黄色葡萄球菌烈性噬菌体的生物学特性及其裂解效果

侯忠余,李传友,朱成林,于基成,唐俊妮   

  1. (1.西南民族大学青藏高原研究院,青藏高原动物遗传资源保护与利用教育部重点实验室,四川 成都 610041;2.西南民族大学食品科学与技术学院,四川 成都 610041;3.大连民族大学 生物技术与资源利用教育部重点实验室,辽宁 大连 116600)
  • 发布日期:2022-04-26
  • 基金资助:
    “十三五”国家重点研发计划重点专项(2018YFD0500500);四川省科技计划项目(2019YJ0261); 生物技术与资源利用教育部重点实验室开放课题(KF2020008);西南民族大学研究生创新项目(CX2020SZ32)

Biological Characteristics and Lytic Activity of a Virulent Staphylococcus aureus Phage

HOU Zhongyu, LI Chuanyou, ZHU Chenglin, YU Jicheng, TANG Junni   

  1. (1. Key Laboratory of Qinghai-Tibetan Plateau, Animal Genetic Resource Reservation and Utilization of Ministry of Education, Institute of Qinghai-Tibetan Plateau, Southwest Minzu University, Chengdu 610041, China; 2. College of Food Sciences and Technology, Southwest Minzu University, Chengdu 610041, China; 3. Key Laboratory of Biotechnology and Bioresources Utilization, Dalian Minzu University, Dalian 116600, China)
  • Published:2022-04-26

摘要: 以耐甲氧西林金黄色葡萄球菌(methicillin-resistant Staphylococcus aureus,MRSA)为宿主菌从奶牛养殖场污水中分离到1 株烈性噬菌体P65。透射电镜表明,噬菌体P65头部呈多面体结构,属于有尾噬菌体目长尾噬菌体科。噬菌体P65最佳感染复数为0.01,一步生长曲线显示,噬菌体P65潜伏期为10 min,裂解周期为90 min,裂解量为35.46 PFU/cell。在pH 4~10和温度30~45 ℃条件下具有稳定的裂解活性。紫外线照射70 min后,噬菌体P65效价由1.91×108 PFU/mL降至2.65×104 PFU/mL。经噬菌体处理48 h后,菌株MRSA 2和MRSA 24的生物被膜清除率分别为91.3%和92.2%。在25 ℃条件下,噬菌体P65在牛奶和牛肉细菌污染模型中有一定的抑菌效果。本研究表明噬菌体P65具有较宽的宿主谱和稳定的裂解杀菌能力,在清除生物被膜和食品抗菌方面有一定的运用潜能。

关键词: 烈性噬菌体;金黄色葡萄球菌;生物学特性;应用

Abstract: A virulent phage P65, one of whose hosts is methicillin-resistant Staphylococcus aureus (MRSA), was isolated from the sewage of dairy cow farm. The transmission electron microscopic (TEM) observation showed that the head of the phage was polyhedral, belonging to the long-tailed Siphoviridae family. Its optimal multiplicity of infection (MOI) was 0.01. The one-step growth curve showed that the latent period of the phage was 10 min, the lysis period was 90 min, and the burst size was 35.46 PFU/cell. Its lytic activity remained stable at pH 4–10 and 30–45 ℃. After 70 min of UV irradiation, the titer of the phage decreased from 1.91 × 108 to 2.65 × 104 PFU/mL. After 48 hours of phage treatment, the biofilm clearance rates of strains MRSA 2 and MRSA 24 were 91.3% and 92.2%, respectively. At 25 ℃, P65 had an antibacterial effect in milk and beef contamination models. The results showed that phage P65 has a wide host spectrum and stable lytic activity, and thus has potential for the removal of biofilm and food preservation.?

Key words: virulent phage; Staphylococcus aureus; biological characterization; application

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