Use of polyvalent bacteriophages to combat biofilm of Proteus mirabilis causing catheter-associated urinary tract infections.

AIMS: Catheter-associated urinary tract infections (CAUTI) caused by Proteus mirabilis are very difficult to treat due to the ability of biofilm formation and drug resistance of these bacteria. The aim of this study was to assess the antibiofilm activity of phages and develop phage cocktail to combat biofilm of P. mirabilis strains. METHODS AND RESULTS: Planktonic forms and biofilms of 50 tested uropathogenic P. mirabilis strains showed different sensitivity to 13 phages used. Phages 39APmC32, 65APm2833 and 72APm5211 presenting strong antibiofilm activity were selected as cocktail components. The antibiofilm activity of phage cocktails was similar or slightly higher than that of the most active phage. A three-phage cocktail inhibited biofilm formation and destroyed biofilms of the same number of strains or 2-3 strains more compared to a single phage. The components of the three-phage cocktail did not block each other's activity. CONCLUSIONS: The potential of developed anti-P. mirabilis phage cocktail as an antibiofilm agent was proved. SIGNIFICANCE AND IMPACT OF THE STUDY: In this study, three broad host range phages presenting strong anti-P. mirabilis biofilm activity were selected. Additionally, high stability of these viruses makes them a useful tool for controlling the biofilms.

O-antigens of bacteria of the genus providencia: structure, serology, genetics, and biosynthesis.

The genus Providencia consists of eight species of opportunistic pathogenic enterobacteria that can cause enteric diseases and urinary tract infections. The existing combined serological classification scheme of three species, P. alcalifaciens, P. stuartii, and P. rustigianii, is based on the specificity of O-antigens (O-polysaccharides) and comprises 63 O-serogroups. Differences between serogroups are related to polymorphism at a specific genome locus, the O-antigen gene cluster, responsible for O-antigen biosynthesis. This review presents data on structures of 36 O-antigens of Providencia, many of which contain unusual monosaccharides and non-carbohydrate components. The structural data correlate with the immunospecificity of the O-antigens and enable substantiation on a molecular level of serological relationships within the genus Providencia and between strains of Providencia and bacteria of the genera Proteus, Escherichia, and Salmonella. Peculiar features of the O-antigen gene cluster organization in 10 Providencia serogroups and biosynthetic pathways of nucleotide precursors of specific monosaccharide components of the O-antigens also are discussed.

Structure of a peptidoglycan-related polysaccharide from Providencia alcalifaciens O45.

A polysaccharide was isolated from the opportunistic human pathogen Providencia alcalifaciens O45:H26 by extraction with aqueous phenol and studied by sugar and methylation analyses along with (1)H and (13)C NMR spectroscopy, including two-dimensional ROESY and H-detected (1)H,(13)C HSQC experiments. The polysaccharide contains N-acetylglucosamine and N-acetylmuramic acid (D-GlcpNAc3Rlac) amidated with L-alanine and has the following structure: →4)-ß-D-GlcpNAc-(1→4)-ß-D-GlcpNAc3(Rlac-L-Ala)-(1→. The polysaccharide possesses a remarkable structural similarity to the bacterial cell wall peptidoglycan. It is not unique to the strain studied but is common to strains of at least four P. alcalifaciens O-serogroups (O3, O24, O38, and O45). No evidence was obtained that the polysaccharide is associated with the LPS, and hence it might represent a bacterial capsule component.

Structure of the O-polysaccharide of Providencia alcalifaciens O25 containing an amide of D-galacturonic acid with N(ε)-[(R)-1-carboxyethyl]-L-lysine.

An acidic O-polysaccharide was isolated by mild acid degradation of the lipopolysaccharide of Providencia alcalifaciens O25 followed by gel-permeation and anion-exchange chromatography. The O-polysaccharide was studied by sugar and methylation analyses along with (1)H and (13)C NMR spectroscopy, including two-dimensional correlation (1)H,(13)C HMBC, and (1)H,(1)H ROESY experiments both in D(2)O and, to detect correlations for NH protons, in a 9 : 1 H(2)O/D(2)O mixture. An amino acid was isolated from the polysaccharide by acid hydrolysis and identified as N(ε)-[(R)-1-carboxyethyl]-L-lysine ("alaninolysine", 2S,8R-alaLys) by determination of the specific optical rotation and (13)C NMR spectroscopy, using the authentic synthetic diastereomers 2S,8R-alaLys and 2S,8S-alaLys for comparison. The structure of the branched tetrasaccharide repeating unit of the O-polysaccharide was established.

New structures of the O-specific polysaccharides of Proteus. 3. Polysaccharides containing non-carbohydrate organic acids.

Four new Proteus O-specific polysaccharides were isolated by mild acid degradation from the lipopolysaccharides of P. penneri 28 (1), P. vulgaris O44 (2), P. mirabilis G1 (O3) (3), and P. myxofaciens (4), and their structures were elucidated using NMR spectroscopy and chemical methods. They were found to contain non-carbohydrate organic acids, including ether-linked lactic acid and amide-linked amino acids, and the following structures of the repeating units were established: [Figure: see text], where (S)-Lac and (R)-aLys stand for (S)-1-carboxyethyl (residue of lactic acid) and N(epsilon)-[(R)-1-carboxyethyl]-L-lysine ("alaninolysine"), respectively. The data obtained in this work and earlier serve as the chemical basis for classification of the bacteria Proteus.

New structures of the O-specific polysaccharides of Proteus. 2. Polysaccharides containing O-acetyl groups.

Structures of five new O-specific polysaccharides of Proteus bacteria were established. Four of them, Proteus penneri 4 (O72), Proteus vulgaris 63/57 (O37), Proteus mirabilis TG 277 (O69), and Proteus penneri 20 (O17), contain O-acetyl groups in non-stoichiometric quantities, and the polysaccharide of P. penneri 1 is structurally related to that of P. penneri 4. The structures were elucidated using NMR spectroscopy, including one-dimensional 1H- and 13C-NMR spectroscopy, two-dimensional 1H,1H correlation (COSY, TOCSY), H-detected 1H,13C heteronuclear multiple-quantum coherence (HMQC), heteronuclear multiple-bond correlation (HMBC), and nuclear Overhauser effect spectroscopy (NOESY or ROESY), along with chemical methods. The structural data obtained are useful as the chemical basis for the creation of the classification scheme for Proteus strains.

New structures of the O-specific polysaccharides of bacteria of the genus Proteus. 1. Phosphate-containing polysaccharides.

The O-specific polysaccharide chains (O-antigens) of the lipopolysaccharides of five Proteus strains, P. vulgaris O17, P. mirabilis O16 and O33, and P. penneri 31and 103, were found to contain phosphate groups that link the non sugar components, e.g., ethanolamine and ribitol. The polysaccharides of P. mirabilis O16 and P. penneri 103 include ribitol phosphate in the main chain and thus resemble ribitol teichoic acids of Gram-positive bacteria. The structures of the polysaccharides were elucidated using NMR spectroscopy, including two-dimensional 1H,1H correlation spectroscopy (COSY and TOCSY), nuclear Overhauser effect spectroscopy (NOESY or ROESY), and H-detected 1H,13C and 1H,31P heteronuclear multiple-quantum coherence spectroscopy (HMQC), along with chemical methods. The structures determined are unique among the bacterial polysaccharides and, together with the data obtained earlier, represent the chemical basic for classification of Proteus strains. Based on structural similarities of the O-specific polysaccharides and serological relationships between the O-antigens, we propose to extend Proteus serogroups O17 and O19 by including P. penneri strains 16 and 31,respectively.

Structure of the O-specific polysaccharide of Proteus vulgaris O37 and close serological relatedness of the lipopolysaccharides of P. vulgaris O37 and P. vulgaris O46.

The O-specific polysaccharide (O-antigen) of the lipopolysaccharide (LPS) of Proteus vulgaris O37 was studied by (1)H and (13)C nuclear magnetic resonance spectroscopy before and after O-deacetylation and found to be structurally similar to that of P. vulgaris O46 studied earlier. The two polysaccharides have the same carbohydrate backbone and differ in the position and number of the O-acetyl groups only. Studies with O-antisera against the two strains using passive hemolysis test, enzyme immunosorbent assay, and Western blot revealed close serological relatedness of the LPSs of P. vulgaris O37 and O46. The O-acetyl groups were found to be of little importance for manifesting the O-specificity but to interfere with binding of anti-P. vulgaris O37 serum to P. vulgaris O46 antigen. Based on the data obtained, it was proposed to combine the strains studied in one Proteus serogroup O37 as subgroups O37a,37b and O37a,37c. A cross-reactivity of O-antisera against P. vulgaris O37 and O46 was observed with LPSs of three more Proteus strains, which could be substantiated by the presence of a common disaccharide fragment in the O-antigens.

Structure of the acidic O-specific polysaccharide from Proteus vulgaris O39 containing 5,7-diacetamido-3,5,7,9-tetradeoxy-L-glycero-L-manno-non-2-ulosonic acid.

The O-specific polysaccharide of Proteus vulgaris O39 was found to contain a new acidic component of Proteus lipopolysaccharides, 5,7-diacetamido-3,5,7,9-tetradeoxy-L-glycero-L-manno-non-2-ulosonic acid (di-N-acetylpseudaminic acid, Pse5Ac7Ac). The following structure of the polysaccharide was determined by NMR spectroscopy, including 2D 1H,(1)H COSY, TOCSY, ROESY, and 1H,(13)C HMQC experiments, along with selective cleavage of the polysaccharide by solvolysis with anhydrous trifluoromethanesulfonic (triflic) acid: -->8)-beta-Psep5Ac7Ac-(2-->3)-alpha-L-FucpNAc-(1-->3)-alpha-D-GlcpNAc-(1--> The structure established is unique among the O-specific polysaccharides, which is in accordance with classification of the strain studied into a separate Proteus serogroup.

Structure of the O-specific polysaccharide of Proteus vulgaris O4 containing a new component of bacterial polysaccharides, 4,6-dideoxy-4.

A high-molecular-mass O-specific polysaccharide was obtained by mild acid degradation of Proteus vulgaris O4 lipopolysaccharide followed by GPC. The polysaccharide was studied by chemical methods along with 1H and 13C NMR spectroscopy, including two-dimensional COSY, TOCSY, NOESY, H-detected 1H,13C HMQC, and 1H,13C HMBC experiments. Solvolysis of the polysaccharide with trifluoromethanesulfonic (triflic) acid resulted in a GlcpA-(1 --> 3)-GlcNAc disaccharide and a novel amino sugar derivative, 4,6-dideoxy-4-[N-[(R)-3-hydroxybutyryl]-L-alanyl]amino-D-glucose [Qui4N(HbAla)]. On the basis of the data obtained, the following structure of the tetrasaccharide repeating unit of the O-specific polysaccharide was established: --> 4)-beta-D-GlcpA-(1 --> 3)-beta-D-GlcpNAc-(1 --> 2)-beta-D-Quip4N(HbAla)-(1 --> 3)-alpha-D-Galp-(1 -->. This structure is unique among the O-specific polysaccharides, which is in accordance with classification of the strain studied in a separate Proteus serogroup.

[Tests for studying invasive properties of selected Proteus mirabilis strains]. / Badanie wlasciwosci inwazyjnych wybranych szczepów Proteus mirabilis.

Proteus mirabilis is an important pathogen of the urinary tract infections (UTI). Lipopolysaccharide (LPS, endotoxin) is one of the pathogenic factors of pathogenicity of these bacteria. In this paper we described the invasion of L929 mouse fibroblasts by P. mirabilis strains, classified into the O10, O23, O30, O43 serogroups. The maximal invasiveness was observed between 4-6 hours of incubation of the tested cells with bacteria. The cytotoxic effect slightly increased with the incubation time, probably as a result of the production of HpmA hemolysin. Incubation of L929 fibroblasts with LPS led to decrease of bacterial invasiveness. We observed that with the time of incubation of L929 cells with LPS (2-22 h), the invasiveness decreased (longer incubation time with LPS--weaker penetration).

The structure of the carbohydrate backbone of the core-lipid A region of the lipopolysaccharide from Proteus vulgaris serotype O25.

The following structure of the lipid A-core region of the lipopolysaccharide (LPS) from Proteus vulgaris serotype O25 was determined by using NMR and chemical analysis of the core oligosaccharide, obtained by mild acid hydrolysis of LPS, of the products of alkaline deacylation of the LPS, and of the products of LPS deamination: [structure: see text] Terminal residues of beta-GlcNAc and beta-Kdo (indicated by bold italics) are present alternatively in approximately 3:2 amount, leaving no unsubstituted beta-Gal. All sugars are in the pyranose form, alpha-Hep is the residue of L-glycero-alpha-D-manno-Hep, alpha-DDHep is the residue of D-glycero-alpha-D-manno-Hep.

Structural and serological studies of the related O-specific polysaccharides of Proteus vulgaris O21 and Proteus mirabilis O48 having oligosaccharide-phosphate repeating units.

The O-specific polysaccharide chains (O-antigens) of the lipopolysaccharides (LPSs) of Proteus mirabilis O48 and Proteus vulgaris O21 were found to have tetrasaccharide and pentasaccharide repeating units, respectively, interlinked by a glycosidic phosphate. Polysaccharides and an oligosaccharide were derived from the LPSs by various degradation procedures and studied by 1H and 13C NMR spectroscopy, including 2D COSY, TOCSY, NOESY, H-detected 1H,13C and 1H,31P HMQC experiments. The following related structures of the repeating units of the O-antigens were established (top: Proteus mirabilis O48; bottom: Proteus vulgaris O21) The O-specific polysaccharide of P. vulgaris O21 has the same structure as that of Hafnia allvei 744 and PCM 1194 [Petersson C., Jachymek, W., Klonowska, A., Lugowski, C., Niedziela, T. & Kenne, L. (1997) Eur. J. Biochem., 245, 668-675], except that the GlcN residue carries the N-acetyl rather than the N-[(R)-3-hydroxybutyryl] group. Serological investigations confirmed the close relatedness of the Proteus and Hafnia O-antigens studied.

Structure of an O-acetylated acidic O-specific polysaccharide of Proteus vulgaris O46.

An acidic O-specific polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Proteus vulgaris O46 and studied by chemical methods (O-deacetylation, sugar and methylation analyses, partial solvolysis) and 1H and 13C NMR spectroscopy. Solvolysis of the O-deacetylated polysaccharide with trifluoromethanesulfonic acid resulted in a alpha-D-GlcpNAc-(1 --> 3)-D-GlcA disaccharide that demonstrated the usefulness of this reagent for selective cleavage of heteropolysaccharides. The following structure for the polysaccharide was established: --> 4)-alpha-D-Glcp6Ac(1 --> 3)-beta-D-GlcpA4Ac-(1 --> 3)-alpha-D-GlcpNAc-(1 --> 3)-beta-D-GlcpA4Ac-(1 --> where the degree of O-acetylation is approximately 65% at position 6 of Glc and 80-95% at position 4 of GlcA residues.

Structure of the O-specific polysaccharide of the bacterium Proteus vulgaris O23.

An acidic O-specific polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of the bacterium Proteus vulgaris O23 (strain PrK 44/57) and found to contain 2-acetamido-2-deoxy-D-galactose, 2-acetamido-2-deoxy-D-glucose, and D-galacturonic acid. Based on 1H- and 13C-NMR spectroscopic studies, including two-dimensional correlation spectroscopy (COSY), total correlation spectroscopy (TOCSY), nuclear Overhauser effect spectroscopy (NOESY), and 1H,13C heteronuclear multiple-quantum coherence (HMQC) experiments, the following structure of the branched tetrasaccharide repeating unit of the polysaccharide was established: [figure], where the degree of O-acetylation of the terminal GalA residue at position 4 is about 80%. A structural similarity of the O-specific polysaccharides of P. vulgaris O23 and P. mirabilis O23 is discussed.

Structure of a glycerol teichoic acid-like O-specific polysaccharide of Proteus vulgaris O12.

A phosphorylated O-specific polysaccharide (O-antigen) was obtained by mild acid degradation of Proteus vulgaris O12 lipopolysaccharide and studied by sugar and methylation analyses, 1H-, 13C- and 31P-NMR spectroscopy, including two-dimensional COSY, TOCSY, NOESY, H-detected 1H, 13C and 1H, 31P heteronuclear multiple-quantum coherence experiments. It was found that the polysaccharide consists of pentasaccharide repeating units connected via a glycerol phosphate group, and has the following structure: where FucNAc is 2-acetamido-2,6-dideoxygalactose and the degree of O-acetylation at position 4 of GalNAc is approximately 25%. Immunochemical studies with P. vulgaris O12 O-antiserum suggested that the lipopolysaccharide studied shares common epitopes with the lipopolysaccharide core of P. vulgaris O8 and with the O-antigens of P. penneri strains 8 and 63.

A monoclonal antibody recognizing the 3-deoxy-D-manno-oct-2-ulosonic acid (Kdo) trisaccharide alphaKdo(2-->4)alphaKdo(2-->4)alphaKdo of Chlamydophila psittaci 6BC lipopolysaccharide.

A monoclonal antibody (mAb) S45-18 was generated against a synthetic neoglycoconjugate containing the trisaccharide alphaKdo(2-->4)alphaKdo(2-->4)alphaKdo (Kdo, 3-deoxy-D-manno-oct-2-ulopyranosonic acid) which represents a structure of the lipopolysaccharide (LPS) from Chlamydophila psittaci 6BC. The antibody was characterized by binding and inhibition assays in ELISA using: (i) the immunizing antigen and chemically synthesized derivatives thereof; (ii) chlamydial elementary bodies (EB); and (iii) LPS of Chl. psittaci 6BC and Chlamydia trachomatis L2. The specificity was determined in comparison to that of mAb S25-23 recognizing the alphaKdo(2-->8)alphaKdo(2-->4)alphaKdo trisaccharide which represents an epitope shared by all species of the family. MAb S45-18 bound to an epitope of the structure alphaKdo(2-->4)alphaKdo(2-->4)alphaKdo, with lower reactivity with the (2-->8)-(2-->4)-linked analog. Using chlamydial EB or LPS, mAb S45-18 bound preferentially to LPS and EB of Chl. psittaci. Therefore, Chl. psittaci LPS contains, in addition to the known genus-specific epitope, a species-specific epitope.

Structure of a new acidic O-antigen of Proteus vulgaris O22 containing O-acetylated 3-acetamido-3,6-dideoxy-D-glucose.

The acidic O-specific polysaccharide of Proteus vulgaris O22 was studied using 1H and 13C NMR spectroscopy, including 2D COSY, TOCSY, NOESY, and H-detected 1H, 13C heteronuclear multiple-quantum coherence (HMQC) experiments, and the following structure for the branched pentasaccharide repeating unit was established: [sequence: see text] where Qui3NAc is 3-acetamido-3,6-dideoxyglucose, O-acetylation of QuiNAc at position 4 is stoichiometric and at position 2 nonstoichiometric. Serological relationships of P. vulgaris O22 with some other Proteus strains were substantiated on the level of the O-antigen structures.