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Structural elucidation of the O-antigen polysaccharide from shigatoxin-producing E. coli O179 using genetic information, NMR spectroscopy and the CASPER program.
Carbohydr Res
January 2025
Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91, Stockholm, Sweden. Electronic address:
The serological properties of the O-antigen polysaccharide region of the lipopolysaccharides are used to differentiate E. coli strains into serogroups. In this study, we report the structure elucidation of the O-specific chain of E.
View Article and Find Full Text PDFStructural and Serological Characterization of Yet Another New O Antigen, O86, in Clinical Strains.
Int J Mol Sci
December 2024
N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia.
Bacteria from the genus are facultative human pathogens, primarily attacking the urinary tract and wounds. A total of 85 O serogroups have been identified so far among these bacilli. Bprz 86 was isolated from the fistula of a patient in Łódź, Poland.
View Article and Find Full Text PDFAn efficient C-glycoside production platform enabled by rationally tuning the chemoselectivity of glycosyltransferases.
Nat Commun
October 2024
Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education) and Key Laboratory of Phytochemical R&D of Hunan Province, College of Chemistry and Chemical Engineering, Hunan Normal University, 410081, Changsha, P. R. China.
Despite the broad potential applications of C-glycosides, facile synthetic methods remain scarce. Transforming glycosyltransferases with promiscuous or natural O-specific chemoselectivity to C-glycosyltransferases is challenging. Here, we employ rational directed evolution of the glycosyltransferase MiCGT to generate MiCGT-QDP and MiCGT-ATD mutants which either enhance C-glycosylation or switch to O-glycosylation, respectively.
View Article and Find Full Text PDFStructure of the O-specific polysaccharide of Asaia bogorensis ATCC BAA-21 lipopolysaccharide.
Carbohydr Res
November 2024
Laboratory of Microbial Immunochemistry and Vaccines, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Weigla 12, 53-114, Wroclaw, Poland.
Asaia bogorensis is a Gram-negative bacterium isolated from flowers and fruits growing in tropical climate, reproductive system of mosquitoes, and rarely from immunocompromised patients. In Europe, A. bogorensis is responsible for the contamination of flavoured mineral waters.
View Article and Find Full Text PDFBackground: (Kpn) is the fourth leading cause of infection-related deaths globally, yet little is known about human antibody responses to invasive Kpn. In this study, we sought to determine whether the O-specific polysaccharide (OPS) antigen, a vaccine candidate, is immunogenic in humans with Kpn bloodstream infection (BSI). We also sought to define the cross-reactivity of human antibody responses among structurally related Kpn OPS subtypes and to assess the impact of capsule production on OPS-targeted antibody binding and function.
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