Project description:Hypervirulent Klebsiella pneumoniae (hvKp) causes invasive infections and severe systemic inflammation. In this study, outer membrane vesicles (OMVs) derived from clinically isolated hvKp and classical K. pneumoniae (cKp) strains were characterized using an integrated proteogenomic workflow combining whole-genome sequencing and label-free LC–MS/MS proteomics. The dataset includes quantitative proteomic profiles of OMVs and whole-cell lysates together with strain-specific protein annotations for comparative analyses of OMVs cargo composition, functional annotation, and pathogenicity.
Project description:To investigate the role of outer membrane vesicles (OMVs) and related proteins in iron acquisition mechanism of hypervirulent Klebsiella pneumoniae (HVKP) and classic Klebsiella pneumoniae (cKP).
Project description:To investigate the whole-genome gene expression difference between the wild-type and capsule deletion mutant in Klebsiella pneumoniae MGH 78578. The mutants analyzed in this study are further described in Huang T.W., Stapleton J.C., Chang H.Y., Tsai S.F., Palsson B.O., Charusanti P. Capsule removal via lambda-Red knockout system perturbs biofilm formation and fimbriae extression in Klesiella pneumoniae MGH 78578 (manuscript submission) A six chip study using total RNA recovered from three separate wild-type cultures and three separate cultures of a capsule deltion mutant of Klebsiella pneumoniae MGH 78578. The capsule gene cluster (KPN_02493 to KPN_02515) was entirely removed in the capsule deletion mutant. Each chip measures the expression level of 5,305 genes from Klebsiella pneumoniae MGH 78578 and the associated five plasmids (pKPN3, pKPN4, pKPN5, pKPN6 and pKPN7) with 50-mer oligo tiling array with 30-mer spacer.
Project description:To investigate the whole-genome gene expression difference between the wild-type and capsule deletion mutant in Klebsiella pneumoniae MGH 78578. The mutants analyzed in this study are further described in Huang T.W., Stapleton J.C., Chang H.Y., Tsai S.F., Palsson B.O., Charusanti P. Capsule removal via lambda-Red knockout system perturbs biofilm formation and fimbriae extression in Klesiella pneumoniae MGH 78578 (manuscript submission)
Project description:Klebsiella pneumoniae is an arising threat to human health. However, host immune responses in response to this bacterium remain to be elucidated. The goal of this study was to identify the dominant host immune responses associated with Klebsiella pneumoniae pulmonary infection. Pulmonary mRNA profiles of 6-8-weeks-old BALB/c mice infected with/without Klebsiella pneumoniae were generated by deep sequencing using Illumina Novaseq 6000. qRT–PCR validation was performed using SYBR Green assays. Using KEGG (Kyoto Encyclopedia of Genes and Genomes) analysis, we identified several immune associated pathways, including complement and coagulation cascades, Toll-like receptor signaling pathway, Rap1 signaling pathway, chemokine signaling pathway, TNF signaling pathway, phagosome and NOD-like receptor signaling pathway, were involved in Klebsiella pneumoniae pulmonary infection. Using ICEPOP (Immune CEll POPulation) analysis, we found that several cell types were involved in the host immune response to Klebsiella pneumoniae pulmonary infection, including dendritic cells, macrophages, monocytes, NK (natural killer) cells, stromal cells. Further, IL-17 chemokines were significantly increased during Klebsiella pneumoniae infection. This study provided evidence for further studying the pathogenic mechanism of Klebsiella pneumoniae pneumonia infection.
Project description:Intestinal colonization by Klebsiella pneumoniae is recognized as a pivotal prerequisite for its systemic dissemination and subsequent invasive infection; however, the metabolic basis and regulatory mechanisms underlying this process remain poorly understood. In this study, we employed transposon insertion sequencing (Tn-seq) to systematically identify metabolic genes associated with intestinal colonization in hypervirulent Klebsiella pneumoniae (hvKp). By integrating high-throughput screening with in vivo phenotypic validation, we identified the global transcriptional regulator DksA as a key factor that markedly enhances hvKp intestinal colonization. Mechanistically, DksA appears to promote colonization by enhancing carbon source metabolism. Combined transcriptomic analyses with homology modeling and molecular dynamics simulations further revealed that DksA induces cascade allosteric remodeling of key RNA polymerase structural domains, thereby enhancing hvKp utilization of common intestinal carbon sources and facilitating intestinal colonization. Collectively, our findings highlight the critical role of transcriptionally regulated metabolic plasticity in hvKp intestinal colonization and provide a theoretical framework and potential targets for developing anti-colonization strategies that exploit pathogen metabolic vulnerabilities.
Project description:Genome-wide gene expression analysis was performed with the cells in exponential and stationary growth phases. Through these two growth status, 89.6% of currently annotated genes were expressed. High-density oligonucleotide tiling arrays consisting of 379,528 50-mer probes spaced 30 bp apart across the whole Klebsiella pneumoniae MGH 78578 genome was used (Roche NimbleGen).
Project description:Investigation of whole genome gene expression level in Klebsiella pneumoniae MGH78578 grown up to mid-exponential phase in M9 minimal media supplemented with 0.2% glucose
