The lipopolysaccharides from two serologically related strains of Pseudomonas aeruginosa II (Sandvik classification) and V (IM-1, Verder-Evans classification) were isolated by the Westphal method and cleaved with 1% acetic acid. The O-specific polysaccharide from Sandvik II lipopolysaccharide involved L-rhamnose, N-acetyl-D-quinovosamine, and N-acetyl-D-galactosaminuronic acid in the ratio 2:1:1, as well as O-acetyl groups. The Verder-Evans V O-specific polysaccharide was found to contain just the same sugars and, in addition, D-glucose, the monosaccharide ratio being 2:1:1:1. On the basis of methylation analysis, Smith degradation, solvolysis with anhydrous hydrogen fluoride and 1H and 13C nuclear magnetic resonance data, it was concluded that the polysaccharides have identical main chains, and there were established the following structures of their repeating units: -4)-alpha-D-GalNAcA-(1-3)-beta-D-QuiNAc-(1-2)-alpha-L-Rha-(1 -3)-alpha-L-Rha-(1- increases 3 60% OAc Sandvik II -4)-alpha-D-GalNAcA-(1-3)-beta-D-QuiNAc-(1-2)-alpha-L-Rha-(1 -3)-alpha-L-Rha-(1- increases 3 alpha-D-Glc Verder-Evans V The data obtained allow us to substantiate the combining of the strains studied into one O-serogroup as two individual O-serotypes.
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Gut Microbes
December 2025
Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu, China.
Protein glycosylation has been considered as a fundamental phenomenon shared by all domains of life. In , glycosylation of flagellins A and B with pseudaminic acid have been rigorously confirmed and shown to be essential for flagella assembly and bacterial colonization. In addition to flagellins, several other proteins including RecA, AlpA/B, and BabA/B in have also been reported to be glycosylated and to be dependent on the lipopolysaccharide (LPS) biosynthetic pathway.
View Article and Find Full Text PDFMicrob Cell Fact
January 2025
College of Veterinary Medicine, Southwest University, Tiansheng Road NO.2, Chongqing, China.
Shiga toxin-producing Escherichia coli (STEC) is one of the major pathogens responsible for severe foodborne infections, and the common serotypes include E. coli O157, O26, O45, O103, O111, O121, and O145. Vaccination has the potential to prevent STEC infections, but no licensed vaccines are available to provide protection against multiple STEC infections.
View Article and Find Full Text PDFInt 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 PDFCarbohydr Res
March 2025
Sweet Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, 741246, India. Electronic address:
Synthesis of the tetrasaccharide repeating unit of the O-polysaccharide from Halomonas fontilapidosi KR26 was accomplished through a convergent [2 + 2]-block strategy using rationally protected monosaccharide synthons derived from commercially available sugars. The target tetrasaccharide was synthesized in the form of its 2-azidoethyl glycoside to ensure further conjugation with specific aglycons without hampering the reducing end stereochemistry. Use of only acyl/aryl protecting groups was targeted to keep the terminal azido-group intact for the utilization of "Click chemistry" for further conjugations.
View Article and Find Full Text PDFAntibodies (Basel)
December 2024
Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of Science, 117991 Moscow, Russia.
Naturally occurring human antibodies against glycans recognize and quickly eliminate infectious bacteria, viruses and aberrantly glycosylated neoplastic malignant cells, and they often initiate processes that involve the complement system. Using a printed glycan array (PGA) containing 605 glycoligands (oligo- and polysaccharides, glycopeptides), we examined which of the glycan-binding antibodies are able to activate the complement system. Using this PGA, the specificities of antibodies of the IgM and IgG classes were determined in the blood serum of healthy donors (suggested as mostly natural), and, then, using the same array, it was determined which types of the bound immunoglobulins were also showing C3 deposition.
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