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In this study, application of magnetic beads (Dynabeads) coated with Aeromonas salmonicida lipopolysaccharide-specific polyclonal antisera to MS-based characterization of bacterial lipopolysaccharides has been evaluated. The results showed that the affinity-based preconcentration strategy resulted in at least a 100-fold increase in the detection of sensitivity, affording direct capillary electrophoresis (CE)-MS analysis of A. salmonicida lipopolysaccharide O-chain polysaccharide from in vitro-cultured cells. Subsequent CE-MS analysis of in vivo-grown cells of A. salmonicida confirmed significant changes in the structure of the lipopolysaccharide O-chain polysaccharide as a result of in vivo cultivation.
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http://dx.doi.org/10.1111/j.1574-6968.2009.01612.x | DOI Listing |
ACS Chem Biol
June 2025
Département de Chimie, UNamur, Narilis, Rue de Bruxelles 61, B-5000 Namur, Belgium.
are pathogenic bacteria responsible for a worldwide zoonosis called brucellosis. In this study, we exploit the d-mannose central metabolism for the selective labeling of lipopolysaccharide (LPS), a key virulence factor in Gram-negative bacteria. Our approach provides chemical tools to allow selective derivatization of bacterial membranes in vivo and a handle for imaging studies.
View Article and Find Full Text PDFVet Immunol Immunopathol
July 2025
Departamento de Medicina Veterinária, Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil. Electronic address:
Brucella abortus exhibits the dissociation phenomenon, in which naturally smooth samples lose the O chain of lipopolysaccharide (LPS) and become rough, associated with changes in colony shape, culture characteristics, cell morphology, immunological reactions, biochemical reactions and, possibly, virulence. However, the significance and impact of S-R dissociation in cultures (in vitro) or even in vivo is unclear, especially considering that rough samples have already been isolated from clinical samples in different hosts and, also, are successfully used as vaccine strains. Thus, the objective of this study was to review the literature on Brucella spp.
View Article and Find Full Text PDFmBio
March 2025
Evolutionary Genomics Group, División de Microbiología, Universidad Miguel Hernández, Alicante, Spain.
Genomic diversity in prokaryotic species is largely due to the existence of extensive pangenomes, allowing different gene complements to be drawn depending on the strain. Here, we have studied the diversity of the O-chain polysaccharide biosynthesis cluster (OBC) in marine bacteria of the Pelagibacterales order as a proxy to measure such genetic diversity in a single population. The study of single-amplified genomes (SAGs) from the whole order found a pattern similar to that of other well-studied microbes, such as the Enterobacteriales or , where distinct OBCs represent strains containing different gene pools.
View Article and Find Full Text PDFmSystems
January 2025
Division of Medical Biology, Jan Kochanowski University in Kielce, Kielce, Poland.
Unlabelled: Pyroptosis is an inflammatory immune response of eukaryotic cells to bacterial lipopolysaccharide (LPS) and other pathological stimuli, leading to the activation of the gasdermin D (GSDMD) and secretion of pore-forming domain GSDMD, facilitating the release of cytokines. Additionally, GSDMD exhibits antibacterial properties through interactions with bacterial outer membranes (OM). We explored alternative antimicrobial strategy to determine whether inducing natural pyroptosis via GSDMD activation by LPS could enhance the effectiveness of recombinant phage endopeptidase KP27 (peptidoglycan-degrading enzyme) against , enabling penetration through OM and bacterial killing synergistically.
View Article and Find Full Text PDFFront Immunol
August 2024
Department of Biological Physical Chemistry, Instituto de Química Física Blas Cabrera, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
is an opportunistic bacterium that frequently colonizes the nasopharynx and gastrointestinal tract and can also cause severe infections when invading other tissues, particularly in immunocompromised individuals. Moreover, variants exhibiting a hypermucoviscous (HMV) phenotype are usually associated with hypervirulent strains that can produce invasive infections even in immunocompetent individuals. Major carbohydrate structures displayed on the surface are the polysaccharide capsule and the lipopolysaccharide, which presents an O-polysaccharide chain in its outermost part.
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