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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
[冯健, E-mail: ironvon@foxmail.comFENG Jian: E-mail: ironvon@foxmail.com
[李福祥, E-mail: lfx98@163.comLI Fuxiang: E-mail: lfx98@163.com
收稿:2022-08-30,
修回:2023-01-14,
纸质出版:2023-05-30
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罗书泓, 汪璐, 徐朝霞, 等. 耐碳青霉烯类肺炎克雷伯菌噬菌体vB_KpnP1的分离鉴定和生物学特性研究[J]. 陆军军医大学学报, 2023,45(10):1030-1039.
Shuhong LUO, Lu WANG, Zhaoxia XU, et al. Isolation, identification and biological characteristics of phage vB_KpnP1 for carbapenem-resistant
罗书泓, 汪璐, 徐朝霞, 等. 耐碳青霉烯类肺炎克雷伯菌噬菌体vB_KpnP1的分离鉴定和生物学特性研究[J]. 陆军军医大学学报, 2023,45(10):1030-1039. DOI: 10.16016/j.2097-0927.202208219.
Shuhong LUO, Lu WANG, Zhaoxia XU, et al. Isolation, identification and biological characteristics of phage vB_KpnP1 for carbapenem-resistant
目的
2
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
2
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
2
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
2
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。
Objective
2
To isolate a strain of lysing carbapenem-resistant
Klebsiella pneumoniae
phage
and explore its biological characteristics and whole genome information.
Methods
2
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
2
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
2
A virulent
Klebsiella pneumoniae
phage
vB_KpnP1
with the potential to treat carbapenem-resistant
Klebsiella pneumoniae
infections
is successfully isolated.
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