Isolation, characterization, therapeutic potential and depolymerase identification of a lytic bacteriophage Kpp-9 against Klebsiella pneumoniae with capsule serotype K2.

IF 3.5 3区 医学 Q3 IMMUNOLOGY
Microbial pathogenesis Pub Date : 2025-11-01 Epub Date: 2025-08-05 DOI:10.1016/j.micpath.2025.107950
Menglu Wang, Jiayi Liu, Xin Jiao, Yanxia Liu, Shuqi Yang, Wenbin Gong, Jinjuan Qiao
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引用次数: 0

Abstract

Klebsiella pneumoniae is one of the most threatening multidrug-resistant bacteria, and its inherent capsule and extensive biofilm formation pose a significant barrier to the treatment of infection. Bacteriophages (or phages) and phage-derived depolymerases are attracting attention as potential alternatives to antibiotics. Here, we isolated a lytic phage, named Kpp-9, using a capsule-type K2 strain, Kp09. Kpp-9 could inhibit bacterial biofilm formation, eradicate the mature biofilm in vitro, improve the survival rate of Kp09-infected mice, and alleviate the symptoms of pneumonia in mice. Morphological and genomic analyses showed that phage Kpp-9 belonged to the class Caudoviricetes and no virulence or resistance genes were found in the genome, indicating potential therapeutic applications of phage Kpp-9. Furthermore, two depolymerases (Kp9042 and Kp9050) were predicted and shown to be able to digest the capsule and improve the susceptibility of K. pneumoniae to complement-mediated serum killing. In addition, Kpp-9 and two depolymerases showed high selectivity for capsule-type K2 K. pneumoniae strains and exhibited robust thermal and pH stability. These results demonstrate that phage Kpp-9 and its encoded depolymerases Kp9042 and Kp9050 may serve as alternative therapeutic agents for the treatment of capsule-type K2 K. pneumoniae infections.

具有胶囊血清型K2的肺炎克雷伯菌裂解噬菌体Kpp-9的分离、鉴定、治疗潜力和解聚合酶鉴定
肺炎克雷伯菌是最具威胁性的多重耐药细菌之一,其固有的荚膜和广泛的生物膜形成对感染的治疗构成了重大障碍。噬菌体(或噬菌体)和噬菌体衍生的解聚合酶作为抗生素的潜在替代品正引起人们的关注。在这里,我们使用胶囊型K2菌株Kp09分离出一种名为Kpp-9的裂解噬菌体。Kpp-9能抑制细菌生物膜的形成,体外清除成熟生物膜,提高感染kp09小鼠的存活率,减轻小鼠肺炎症状。形态学和基因组分析表明,噬菌体Kpp-9属于尾柱菌纲,基因组中未发现毒力或抗性基因,提示Kpp-9具有潜在的治疗应用价值。此外,两种解聚合酶(Kp9042和Kp9050)被预测并证明能够消化胶囊并提高肺炎克雷伯菌对补体介导的血清杀伤的敏感性。此外,Kpp-9和两种解聚合酶对胶囊型K2肺炎克雷伯菌菌株表现出高选择性,并表现出良好的热稳定性和pH稳定性。这些结果表明,噬菌体Kpp-9及其编码的解聚合酶Kp9042和Kp9050可能作为治疗胶囊型K2 k肺炎感染的替代药物。
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来源期刊
Microbial pathogenesis
Microbial pathogenesis 医学-免疫学
CiteScore
7.40
自引率
2.60%
发文量
472
审稿时长
56 days
期刊介绍: Microbial Pathogenesis publishes original contributions and reviews about the molecular and cellular mechanisms of infectious diseases. It covers microbiology, host-pathogen interaction and immunology related to infectious agents, including bacteria, fungi, viruses and protozoa. It also accepts papers in the field of clinical microbiology, with the exception of case reports. Research Areas Include: -Pathogenesis -Virulence factors -Host susceptibility or resistance -Immune mechanisms -Identification, cloning and sequencing of relevant genes -Genetic studies -Viruses, prokaryotic organisms and protozoa -Microbiota -Systems biology related to infectious diseases -Targets for vaccine design (pre-clinical studies)
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