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Carriage of Capsular Serotype K1 Klebsiella pneumoniae Sequence Type 23 Strains in Healthy Microbiology Laboratory Staff in Russia.

ABSTRACT: Klebsiella pneumoniae causes both nosocomial and community-associated infections. Among the hypervirulent K. pneumoniae (hvKP) isolates, K1 is the most common capsular serotype. Here, we report the draft genome sequences of 3 K1-type (sequence type 23) K. pneumoniae strains isolated from healthy microbiology laboratory staff in Russia.

SUBMITTER: Kuzina ES

PROVIDER: S-EPMC8142582 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature

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Carriage of Capsular Serotype K1 Klebsiella pneumoniae Sequence Type 23 Strains in Healthy Microbiology Laboratory Staff in Russia.

Kuzina Ekaterina S ES Novikova Tatiana S TS Solomentsev Viktor I VI Sizova Angelika A AA Astashkin Eugeny I EI Fursova Nadezhda K NK

Microbiology resource announcements 20210513 19

Klebsiella pneumoniae causes both nosocomial and community-associated infections. Among the hypervirulent K. pneumoniae (hvKP) isolates, K1 is the most common capsular serotype. Here, we report the draft genome sequences of 3 K1-type (sequence type 23) K. pneumoniae strains isolated from healthy microbiology laboratory staff in Russia. ...[more]

PMID: 33986096

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Project description:Klebsiella pneumoniae, especially hypervirulent K. pneumoniae (hvKP), is a common opportunistic pathogen that often causes hospital- and community-acquired infections. Capsular polysaccharide (CPS) is an important virulence factor of K. pneumoniae. Some phages encode depolymerases that can recognize and degrade bacterial polysaccharides. In this study, the lytic bacteriophage vB_KpnP_ZK1 (abbreviated as ZK1) was isolated using serotype K1 hvKP as the host. Although amino acid sequence BLAST analysis indicated that the tail fiber protein Depo16 of phage ZK1 showed no significant similarity to any reported phage depolymerases, it displayed enzymatic activities that are characteristic of phage depolymerases. After expression and purification, Depo16 could efficiently remove the capsular polysaccharide layer that surrounds the surface of serotype K1 K. pneumoniae. Although no bactericidal activity was detected, Depo16 makes serotype K1 K. pneumoniae sensitive to peritoneal macrophages (PMs). In addition, in a mouse bacteremia model of serotype K1 K. pneumoniae, 25 µg of Depo16 was effective in significantly prolonging survival. Depo16 treatment can reduce the bacterial load in blood and major tissues and alleviate tissue damage in mice. This indicates that the putative depolymerase Depo16 is a potential antibacterial agent against serotype K1 K. pneumoniae infections.IMPORTANCEKlebsiella pneumoniae often causes hospital-acquired infections and community-acquired infections. Capsular polysaccharide (CPS) is one of the crucial virulence factors of K. pneumoniae. K1 and K2 capsular-type K. pneumoniae strains are the most prevalent serotypes of hypervirulent K. pneumoniae (hvKP). In this study, a novel K. pneumoniae phage named vB_KpnP_ZK1 was isolated, and its putative depolymerase Depo16 showed low homology with other reported phage depolymerases. Depo16 can specifically degrade the K. pneumoniae K1 capsule making this serotype sensitive to peritoneal macrophages. More importantly, Depo16 showed a significant therapeutic effect in a mouse bacteremia model caused by serotype K1 K. pneumoniae. Thus, Depo16 is a potential antibacterial agent to combat serotype K1 K. pneumoniae infections.

Dataset Information

Carriage of Capsular Serotype K1 Klebsiella pneumoniae Sequence Type 23 Strains in Healthy Microbiology Laboratory Staff in Russia.

Publications

Carriage of Capsular Serotype K1 Klebsiella pneumoniae Sequence Type 23 Strains in Healthy Microbiology Laboratory Staff in Russia.

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