Isolation, identification and biological characteristics of phage vB_KpnP1 for carbapenem-resistant <italic style="font-style: italic">Klebsiella pneumoniae</italic>

Shuhong LUO; Lu WANG; Zhaoxia XU; Jiajiao LIU; Weiwei ZHANG; Jian FENG; Fuxiang LI

doi:10.16016/j.2097-0927.202208219

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Isolation, identification and biological characteristics of phage vB_KpnP1 for carbapenem-resistant Klebsiella pneumoniae

Basic Medicine | 更新时间：2026-01-09

- Isolation, identification and biological characteristics of phage vB_KpnP1 for carbapenem-resistant Klebsiella pneumoniae
- Journal of Army Medical University Vol. 45, Issue 10, Pages: 1030-1039(2023)
- 作者机构：
  
  1.646000 四川泸州, 西南医科大学附属医院呼吸内科
  2.610083 成都, 西部战区总医院：重症医学科
  3.610083 成都, 西部战区总医院：检验科
  4.610083 成都, 西部战区总医院：急诊科
- 作者简介：
- 基金信息：
  
  the Cadre Health Research Project of Sichuan Provincial Health Commission(川干研2022-1303);the Military Medical Research Project of General Hospital of Western Theater Command(2019LH05)
- DOI：10.16016/j.2097-0927.202208219
  CLC： Q93-331;Q939.48
- Received：30 August 2022，
  
  Revised：2023-01-14，
  
  Published：30 May 2023
- 稿件说明：
移动端阅览
Shuhong LUO, Lu WANG, Zhaoxia XU, et al. Isolation, identification and biological characteristics of phage vB_KpnP1 for carbapenem-resistant Klebsiella pneumoniae[J]. Journal of Army Medical University, 2023, 45(10): 1030-1039.
DOI：

Shuhong LUO, Lu WANG, Zhaoxia XU, et al. Isolation, identification and biological characteristics of phage vB_KpnP1 for carbapenem-resistant Klebsiella pneumoniae[J]. Journal of Army Medical University, 2023, 45(10): 1030-1039. DOI： 10.16016/j.2097-0927.202208219.

摘要

目的

分离出1株裂解碳青霉烯类耐药肺炎克雷伯菌(carbapenem-resistant

Klebsiella pneumoniae

CRKP)的噬菌体，研究其生物学特性和全基因组信息。

方法

采用双层琼脂平板法从西部战区总医院污水中分离纯化噬菌体，通过透射电镜观察噬菌体的形态，测定噬菌体的生物学特性和体外抑菌活性，进行全基因组测序并分析其结构特征，系统发育进化树和比较基因组分析其进化关系。

结果

分离出1株烈性噬菌体，命名为vB_KpnP1，形成的噬菌斑为2~3 mm透明的圆形，周围有明显的晕环；电镜下发现该噬菌体的头部大小约68.2 nm×64.3 nm，尾部长约11 nm，其头部为正二十面体，有1条不可收缩的短尾，属于有尾噬菌体目，自复制短尾噬菌体科；其最佳感染复数(multiplicity of infection

MOI)为0.000 1，潜伏期为10 min，裂解期为30 min，爆发量为26 PFU/cell；10 min吸附率约为80%；该噬菌体对氯仿不敏感，在温度为10~50 ℃、pH值为4~12条件下较稳定；其对碳青霉烯类耐药肺炎克雷伯菌裂解率为54.55%(12/22)；体外抑菌实验表明其可抑制宿主菌的生长。噬菌体vB_KpnP1为双链DNA(dsDNA)，基因组全长为40 352 bp，GC含量为53.09%，含有50个编码序列(coding sequence

CDS)。

结论

成功分离出1株具有治疗碳青霉烯类耐药肺炎克雷伯菌感染潜力的毒性噬菌体vB_KpnP1。

Abstract

Objective

To isolate a strain of lysing carbapenem-resistant

Klebsiella pneumoniae

phage

and explore its biological characteristics and whole genome information.

Methods

The phage was is

olated and purified from waste water of the General Hospital of Western Theater Command Hospital by the double-layer agar plate method. The morphology of phage was observed by transmission electron microscopy

and its biological properties and

in vitro

antibacterial activity were determined. Whole-genome sequencing was used to analyze its structural characteristics

and a phylogenetic evolutionary tree and the comparative genomic analysis was conducted to analyze the evolutionary relationships of phage.

Results

A virulent phage was isolated and named vB_KpnP1

which formed a 2~3 mm transparent circular spot surrounded by a distinct halo; Electron microscopy showed that the head size of the phage was about 68.2 nm×64.3 nm

and the tail length was about 11 nm; The head of the phage was a regular icosahedron with a non-contractile short tail

which was thus identified as a member of the

Autographiviridae

family and the

Caudovirales

order; the optimal multiplicity of infection was 0.0 001

the incubation period was 10 min

the lysis period was 30 min

and the amount of lysis was 26 PFU/cell; The adsorption rate was about 80% in 10 min. The phage was insensitive to chloroform and was stable at temperatures of 10~50 ℃ and pH values of 4~12; The lysis rate of carbapenem-resistant

Klebsiella pneumoniae

was 54.55% (12/22)

and the host spectrum was wide;

In vitro

antibacterial test showed that it could inhibit the growth of host bacteria. Phage vB_KpnP1 was double-stranded DNA (dsDNA) with a 40 352 bp of full genome length

and 53.09% of GC content. It contained 50 CDS.

Conclusion

A virulent

Klebsiella pneumoniae

phage

vB_KpnP1

with the potential to treat carbapenem-resistant

Klebsiella pneumoniae

infections

is successfully isolated.

关键词

Keywords

references

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⁰

Isolation, identification and biological characteristics of phage vB_KpnP1 for carbapenem-resistant Klebsiella pneumoniae

DOI：10.16016/j.2097-0927.202208219

摘要

Abstract

关键词

Keywords

references