Project description:Klebsiella pneumoniae is an important human pathogen, causing various infections. Apart from traditional virulence factors, there remains a significant gap in the discovery and research of new chromosomal virulence factors. CpxR is a two-component system (TCS) response regulator, but its impact on the virulence of Klebsiella pneumoniae have not been conclusively determined. For the effect of CpxR on K. pneumoniae virulence, the cpxR deletion(ΔcpxR) strain exhibited reduced serum resistance and attenuated pathogenicity in both Galleria mellonella larvae and mouse infection models compared to the wild-type strain. To identify CpxR-regulated virulence genes, RNA-seq analysis was conducted, followed by deletion of transcription downregulated genes in the ΔcpxR strain. Through serum resistance assays and Galleria mellonella infection experiments, a novel potential virulence factor, KPHS_28080, was identified. Deletion of KPHS_28080 impaired serum survival and proliferation in carbapenem-resistant strains HS11286 and hypervirulent strain ATCC 43816. Furthermore, the ATCC 43816 ΔKPHS_28080 strain showed significantly reduced colonization, proliferation, and multi-organ dissemination capacity in mice, accompanied by diminished pathogenicity. The KPHS_28080 promoter contains a conserved CpxR binding motif, where CpxR binding enhances promoter activity and elevates gene transcription. Sequence alignment revealed that KPHS_28080 is widely conserved across Klebsiella pneumoniae strains, establishing it as a novel chromosome-encoded virulence factor. These results provide a new insight into the CpxR regulation of K. pneumoniae virulence and chromosomal virulence factors.

2025-07-10 | GSE300466 | GEO

Klebsiella pneumoniae subsp. pneumoniae

Project description:Klebsiella pneumoniae subsp. pneumoniae 43816 WGS

| PRJNA994484 | ENA

Klebsiella pneumoniae subsp. pneumoniae ATCC 43816

Project description:Klebsiella pneumoniae subsp. pneumoniae Adaptive Evolution to Colistin Selection

| PRJNA922161 | ENA

Gene expression in Klebsiella pneumoniae

Project description:Elucidating the RamA Regulon in Klebsiella pneumoniae and the transcriptome profiles of multidrug resistant Klebsiella pneumoniae

2017-12-25 | GSE24688 | GEO

Klebsiella pneumoniae subsp. pneumoniae strain:ATCC 4352

Project description:Klebsiella pneumoniae subsp. pneumoniae strain:ATCC 4352 Genome sequencing

| PRJNA1224045 | ENA

Complete Genome Sequence of Klebsiella pneumoniae Strain ATCC 43816.

Project description:Klebsiella pneumoniae is a member of Enterobacteriaceae that causes a multitude of infections in compromised and healthy individuals. The rise of hypervirulent and multiple-drug-resistant K. pneumoniae strains has made this organism a global health threat. Here, we report the complete genome sequence of K. pneumoniae strain ATCC 43816.

| S-EPMC7862963 | biostudies-literature

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