title: Structure and serological properties of the O-antigen of two clinical Proteus mirabilis strains classified into a new Proteus O77 serogroup.
abstract: Two Proteus mirabilis strains, 3 B-m and 3 B-k, were isolated from urine and faeces of a hospitalized patient from Lodz, Poland. It was suggested that one strain originated from the other, and the presence of the bacilli in the patient's urinary tract was most probably a consequence of autoinfection. The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of P. mirabilis 3 B-m and studied by sugar analysis and nuclear magnetic resonance spectroscopy, including two-dimensional rotating frame Overhause effect spectroscopy (ROESY) and 1H,13C heteronuclear single quantum coherence (HSQC) experiments. The following structure of the linear trisaccharide-repeating unit of the O-polysaccharide was established:-->2)-beta-D-Glcp-(1-->3)-alpha-L-6dTalp2Ac-(1-->3)-beta-D-GlcpNAc-(1-->where 6dTal2Ac stands for 2-O-acetyl-6-deoxy-L-talose. It resembles the structure of the O-polysaccharide of Proteus penneri O66, which includes additional lateral residues of 2,3-diacetamido-2,3,6-trideoxy-L-mannose. The lipopolysaccharides from two P. mirabilis strains studied were serologically identical to each other but not to that from any of the existing 76 Proteus O-serogroups. Therefore, the strains were classified into a new O77 serogroup specially created in the genus Proteus. Serological studies using Western blot and enzyme-linked immunosorbent assay with intact and adsorbed O-antisera showed that the P. mirabilis O77 antigen is related to Proteus vulgaris O2 and P. penneri O68 antigens, and a putative disaccharide epitope responsible for the cross-reactivity was revealed.
authors.affiliation: Department of General Microbiology, Institute of Microbiology and Immunology, University of Lodz, Lodz, Poland. domkam@biol.uni.lodz.pl
authors.forename: Dominika
authors.initials: D
authors.lastname: Drzewiecka
authors.forename: Nikolay P
authors.initials: NP
authors.lastname: Arbatsky
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Shashkov
authors.forename: Paweł
authors.initials: P
authors.lastname: Staczek
authors.forename: Yuriy A
authors.initials: YA
authors.lastname: Knirel
authors.forename: Zygmunt
authors.initials: Z
authors.lastname: Sidorczyk
mesh_terms: D015153:Blotting, Western; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D016172:DNA Fingerprinting; D005243:Feces / Q000382:microbiology; D005260:Female; D006801:Humans; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D019081:O Antigens / Q000737:chemistry* / Q000276:immunology*; D011512:Proteus Infections / Q000382:microbiology*; D011513:Proteus mirabilis / Q000145:classification* / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification; D012703:Serotyping; D014556:Urine / Q000382:microbiology
chemical_list: D019081:O Antigens