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Kauffman RC, Adekunle O, Yu H, Cho A, Nyhoff LE, Kelly M, Harris JB, Bhuiyan TR, Qadri F, Calderwood SB, Charles RC, Ryan ET, Kong J, Wrammert J. Impact of Immunoglobulin Isotype and Epitope on the Functional Properties of Vibrio cholerae O-Specific Polysaccharide-Specific Monoclonal Antibodies. mBio 2021; 12:e03679-20. [PMID: 33879588 PMCID: PMC8092325 DOI: 10.1128/mbio.03679-20] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 03/15/2021] [Indexed: 01/15/2023] Open
Abstract
Vibrio cholerae causes the severe diarrheal disease cholera. Clinical disease and current oral cholera vaccines generate antibody responses associated with protection. Immunity is thought to be largely mediated by lipopolysaccharide (LPS)-specific antibodies, primarily targeting the O-antigen. However, the properties and protective mechanism of functionally relevant antibodies have not been well defined. We previously reported on the early B cell response to cholera in a cohort of Bangladeshi patients, from which we characterized a panel of human monoclonal antibodies (MAbs) isolated from acutely induced plasmablasts. All antibodies in that previous study were expressed in an IgG1 backbone irrespective of their original isotype. To clearly determine the impact of affinity, immunoglobulin isotype and subclass on the functional properties of these MAbs, we re-engineered a subset of low- and high-affinity antibodies in different isotype and subclass immunoglobulin backbones and characterized the impact of these changes on binding, vibriocidal, agglutination, and motility inhibition activity. While the high-affinity antibodies bound similarly to O-antigen, irrespective of isotype, the low-affinity antibodies displayed significant avidity differences. Interestingly, despite exhibiting lower binding properties, variants derived from the low-affinity MAbs had comparable agglutination and motility inhibition properties to the potently binding antibodies, suggesting that how the MAb binds to the O-antigen may be critical to function. In addition, not only pentameric IgM and dimeric IgA, but also monomeric IgA, was remarkably more potent than their IgG counterparts at inhibiting motility. Finally, analyzing highly purified F(ab) versions of these antibodies, we show that LPS cross-linking is essential for motility inhibition.IMPORTANCE Immunity to the severe diarrheal disease cholera is largely mediated by lipopolysaccharide (LPS)-specific antibodies. However, the properties and protective mechanisms of functionally relevant antibodies have not been well defined. Here, we have engineered low and high-affinity LPS-specific antibodies in different immunoglobulin backbones in order to assess the impact of affinity, immunoglobulin isotype, and subclass on binding, vibriocidal, agglutination, and motility inhibition functional properties. Importantly, we found that affinity did not directly dictate functional potency since variants derived from the low-affinity MAbs had comparable agglutination and motility inhibition properties to the potently binding antibodies. This suggests that how the antibody binds sterically may be critical to function. In addition, not only pentameric IgM and dimeric IgA, but also monomeric IgA, was remarkably more potent than their IgG counterparts at inhibiting motility. Finally, analyzing highly purified F(ab) versions of these antibodies, we show that LPS cross-linking is essential for motility inhibition.
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Affiliation(s)
- Robert C Kauffman
- Division of Infectious Disease, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Oluwaseyi Adekunle
- Division of Infectious Disease, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Hanyi Yu
- Department of Computer Science, Emory University, Atlanta, Georgia, USA
| | - Alice Cho
- Division of Infectious Disease, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Lindsay E Nyhoff
- Division of Infectious Disease, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Meagan Kelly
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Jason B Harris
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Taufiqur Rahman Bhuiyan
- Infectious Diseases Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Firdausi Qadri
- Infectious Diseases Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Stephen B Calderwood
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Richelle C Charles
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Edward T Ryan
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
- Department of Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Jun Kong
- Department of Computer Science, Emory University, Atlanta, Georgia, USA
- Department of Mathematics and Statistics, Georgia State University, Atlanta, Georgia, USA
| | - Jens Wrammert
- Division of Infectious Disease, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, USA
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Xu P, Stevens ED, French AD, Kováč P. Synthesis and molecular structure of the 5-methoxycarbonylpentyl α-glycoside of the upstream, terminal moiety of the O-specific polysaccharide of Vibrio cholerae O1, serotype Inaba. Molecules 2015; 20:2892-902. [PMID: 25679049 PMCID: PMC6272311 DOI: 10.3390/molecules20022892] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Accepted: 02/05/2015] [Indexed: 11/16/2022] Open
Abstract
The trimethylsilyl trifluoromethanesulfonate (TMSOTf)-catalyzed reaction of methyl 6-hydroxyhexanoate with 3-O-benzyl-4-(2,4-di-O-acetyl-3-deoxy-l-glycero-tetronamido)-4,6-dideoxy-2-O-levulinoyl-α-d-mannopyranosyl trichloroacetimidate followed by a two-step deprotection (hydrogenolysis over Pd/C catalyst and Zemplén deacylation, to simultaneously remove the acetyl and levulinoyl groups) gave 5-(methoxycarbonyl)pentyl 4-(3-deoxy-l-glycero-tetronamido)-4,6-dideoxy-α-d-mannopyranoside. The structure of the latter, for which crystals were obtained in the analytically pure state for the first time, followed from its NMR and high-resolution mass spectra and was confirmed by X-ray crystallography. The molecule has two approximately linear components; a line through the aglycon intersects a line through the mannosyl and tetronylamido groups at 120°. The crystal packing separates the aglycon groups from the tetronylamido and mannosyl groups, with only C-H…O hydrogen bonding among the aglycon groups and N-H…O, O-H…O and C-H…O links among the tetronylamido and mannosyl groups. A carbonyl oxygen atom accepts the strongest O-H…O hydrogen bond and two strong C-H…O hydrogen bonds. The geometric properties were compared with those of related molecules.
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Affiliation(s)
- Peng Xu
- NIDDK, LBC, National Institutes of Health, Bethesda, MD 20892-0815, USA.
| | - Edwin D Stevens
- Department of Chemistry, Western Kentucky University, 1906 College Heights Blvd., Bowling Green, KY 42101-1709, USA.
| | - Alfred D French
- Southern Regional Research Center, US Department of Agriculture, 1100 Robert E Lee Blvd, New Orleans, LA 70124, USA.
| | - Pavol Kováč
- NIDDK, LBC, National Institutes of Health, Bethesda, MD 20892-0815, USA.
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Jahouh F, Xu P, Vann WF, Kováč P, Banoub JH. Mapping the glycation sites in the neoglycoconjugate from hexasaccharide antigen of Vibrio cholerae, serotype Ogawa and the recombinant tetanus toxin C-fragment carrier. J Mass Spectrom 2013; 48:1083-1090. [PMID: 24130011 PMCID: PMC4155328 DOI: 10.1002/jms.3258] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 07/24/2013] [Accepted: 07/25/2013] [Indexed: 06/02/2023]
Abstract
We report herein the glycation sites in a vaccine candidate for cholera formed by conjugation of the synthetic hexasaccharide fragment of the O-specific polysaccharide of Vibrio cholerae, serotype Ogawa, to the recombinant tetanus toxin C-fragment (rTT-Hc) carrier. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis of the vaccine revealed that it is composed of a mixture of neoglycoconjugates with carbohydrate : protein ratios of 1.9 : 1, 3.0 : 1, 4.0 : 1, 4.9 : 1, 5.9 : 1, 6.9 : 1, 7.9 : 1 and 9.1 : 1. Liquid chromatography tandem mass spectrometry (LC-MS/MS) analysis of the tryptic and GluC V8 digests allowed identification of 12 glycation sites in the carbohydrate-protein neoglycoconjugate vaccine. The glycation sites are located exclusively on lysine (Lys) residues and are listed as follows: Lys 22, Lys 61, Lys 145, Lys 239, Lys 278, Lys 318, Lys 331, Lys 353, Lys 378, Lys 389, Lys 396 and Lys 437. Based on the 3-D representation of the rTT-Hc protein, all the glycation sites correspond to lysines located at the outer surface of the protein.
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Affiliation(s)
- Farid Jahouh
- Memorial University Biochemistry Department, St John’s, NL, Canada, A1B 3X7
| | - Peng Xu
- NIH, NIDDK, LBC Bethesda, MD, 20892-0815, USA
| | - Willie F. Vann
- Laboratory of Bacterial Toxins OVRR, CBER, FDA, 8800 Rockville Pike, Bethesda, MD, 20892, USA
| | - Pavol Kováč
- Fisheries and Oceans Canada, Science Branch, Special Projects, St John’s, NL, Canada, A1C 5X1
| | - Joseph H. Banoub
- Memorial University Biochemistry Department, St John’s, NL, Canada, A1B 3X7
- Fisheries and Oceans Canada, Science Branch, Special Projects, St John’s, NL, Canada, A1C 5X1
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Jahouh F, Saksena R, Kováč P, Banoub J. Revealing the glycation sites in synthetic neoglycoconjugates formed by conjugation of the antigenic monosaccharide hapten of Vibrio cholerae O1, serotype Ogawa with the BSA protein carrier using LC-ESI-QqTOF-MS/MS. J Mass Spectrom 2012; 47:890-900. [PMID: 22791257 PMCID: PMC3427934 DOI: 10.1002/jms.2974] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this manuscript, we present the determination of glycation sites in synthetic neoglycoconjugates formed by conjugation of the antigenic monosaccharide hapten of Vibrio cholerae O1 serotype Ogawa to BSA using nano- liquid chromatography electrospray ionization quadrupole time-of-flight tandem mass spectroscopy (LC-ESI-QqTOF-MS/MS). The matrix-assisted laser desorption/ionization-TOF/TOF-MS/MS analyses of the tryptic digests of the glycoconjugates having a hapten:BSA ratio of 4.3:1, 6.6:1 and 13.2:1 revealed only three glycation sites, on the following lysine residues: Lys 235, Lys 437 and Lys 455. Digestion of the neoglycoconjugates with the proteases trypsin and GluC V8 gave complementary structural information and was shown to maximize the number of recognized glycation sites. Here, we report identification of 20, 27 and 33 glycation sites using LC-ESI-QqTOF-MS/MS analysis of a series of synthetic neoglycoconjugates with a hapten:BSA ratio of, respectively, 4.3:1, 6.6:1 and 13.2:1. We also tentatively propose that all the glycated lysine residues are located mainly near the outer surface of the protein.
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Affiliation(s)
- Farid Jahouh
- Department of Chemistry, Memorial University of Newfoundland, Saint John’s NL, Canada
| | - Rina Saksena
- NIDDK, LBC, National Institutes of Health, Bethesda, MD, 20892-0815, USA
| | - Pavol Kováč
- NIDDK, LBC, National Institutes of Health, Bethesda, MD, 20892-0815, USA
| | - Joseph Banoub
- Department of Chemistry, Memorial University of Newfoundland, Saint John’s NL, Canada
- Department of Fisheries and Oceans Canada, Science Branch, Special Projects, Saint John’s NL, A1C 5X1, Canada
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Xu P, Alam MM, Kalsy A, Charles RC, Calderwood SB, Qadri F, Ryan ET, Kováč P. Simple, direct conjugation of bacterial O-SP-core antigens to proteins: development of cholera conjugate vaccines. Bioconjug Chem 2011; 22:2179-85. [PMID: 21899371 PMCID: PMC3197769 DOI: 10.1021/bc2001984] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bacterial O-SP-core antigens can be conjugated to proteins in the same, simple way as synthetic, linker-equipped carbohydrates by applying squaric acid chemistry. Introduction of spacers (linkers) to either O-SP-core antigens or protein carriers, which is involved in commonly applied protocols, is not required. The newly developed method described here consists of preparation of a squaric acid monoester derivative of O-SP-core antigen, utilizing the amino group inherent in the core, and reaction of the monoester with the carrier protein. The intermediate monoester can be easily purified; its conjugation can be monitored by SELDI-TOF mass spectrometry and, thus, readily controlled, since the conjugation can be terminated when the desired carbohydrate-protein ratio is reached. Here, we describe production of conjugates containing the O-SP-core antigen of Vibrio cholerae O1, the major cause of cholera, a severe dehydrating diarrheal disease of humans. The resultant products are recognized by convalescent phase sera from patients recovering from cholera in Bangladesh, and anti-O-SP-core-protein responses correlate with plasma antilipopolysaccharide and vibriocidal responses, which are the primary markers of protection from cholera. The results suggest that such conjugates have potential as vaccines for cholera and other bacterial diseases.
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Affiliation(s)
- Peng Xu
- NIDDK, LBC, National Institutes of Health, 8 Center Drive, Bethesda, MD 20892-0815 (U.S.A.)
| | - Mohammad Murshid Alam
- Division of Infectious Diseases, Massachusetts General Hospital, 55 Fruit Street; Boston, MA 02114 USA
- International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh (ICDDR,B), Mohakhali, 1212, Dhaka, Bangladesh
| | - Anuj Kalsy
- Division of Infectious Diseases, Massachusetts General Hospital, 55 Fruit Street; Boston, MA 02114 USA
| | - Richelle C. Charles
- Division of Infectious Diseases, Massachusetts General Hospital, 55 Fruit Street; Boston, MA 02114 USA
| | - Stephen B. Calderwood
- Division of Infectious Diseases, Massachusetts General Hospital, 55 Fruit Street; Boston, MA 02114 USA
- Harvard Medical School, 25 Shattuck St, Boston, MA 02115 USA
| | - Firdausi Qadri
- International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh (ICDDR,B), Mohakhali, 1212, Dhaka, Bangladesh
| | - Edward T. Ryan
- Division of Infectious Diseases, Massachusetts General Hospital, 55 Fruit Street; Boston, MA 02114 USA
- Harvard Medical School, 25 Shattuck St, Boston, MA 02115 USA
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, 677 Huntington Avenue, Boston, MA 02115 USA
| | - Pavol Kováč
- NIDDK, LBC, National Institutes of Health, 8 Center Drive, Bethesda, MD 20892-0815 (U.S.A.)
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Telesmanich NR, Akulova MV, Lomov IM, Alekseeva LP, Kruglikova VD, Agafonova VV, Tatarenko OA, Evdokimova VV. [Evaluation of toxin producing abilities of non-O1/non-O139 serogroup Vibrio cholerae isolated from humans]. Zh Mikrobiol Epidemiol Immunobiol 2011:8-12. [PMID: 21604389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
AIM Determination of non-O1/non-O139 Vibrio cholerae toxin (CT) gene expression by using EIA, and biological effect of non-O1/non-O139 V. cholerae supernatant on cell cultures evaluation. MATERIALS AND METHODS 39 V. cholerae strains from various serological groups were studied. Hemolytic activity of strains was determined by using Greig test, and cholera toxin production--in GM1-EIA and in continuous cell lines by registering cytotonic, cytotoxic and proteolitic effect. RESULTS GM1-EIA method does not detect CT production in 29 museum strains of non-O1/non-O139 V. cholerae in vitro. CT was detected only in 1 non-O1/non-O139 V. cholerae strain supernatant with OD = 0.577 that is substantially lower than in O1 V. cholerae strains (OD = 2.176). In cell cultures non-O1/non-O139 V. cholerae supernatants diluted to 1:100 caused elongation only in single cells. CONCLUSION Cytological model is a more sensitive technique to evaluate toxin producing abilities of non-O1/non-O139 V. cholerae strains and is appropriate for use.
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Jahouh F, Saksena R, Aiello D, Napoli A, Sindona G, Kováč P, Banoub JH. Glycation sites in neoglycoglycoconjugates from the terminal monosaccharide antigen of the O-PS of Vibrio cholerae O1, serotype Ogawa, and BSA revealed by matrix-assisted laser desorption-ionization tandem mass spectrometry. J Mass Spectrom 2010; 45:1148-1159. [PMID: 20860010 DOI: 10.1002/jms.1796] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We present the MALDI-TOF/TOF-MS analyses of various hapten-bovine serum albumin (BSA) neoglycoconjugates obtained by squaric acid chemistry coupling of the spacer-equipped, terminal monosaccharide of the O-specific polysaccharide of Vibrio cholerae O1, serotype Ogawa, to BSA. These analyses allowed not only to calculate the molecular masses of the hapten-BSA neoglycoconjugates with different hapten-BSA ratios (4.3, 6.6 and 13.2) but, more importantly, also to localize the covalent linkages (conjugation sites) between the hapten and the carrier protein. Determination of the site of glycation was based on comparison of the MALDI-TOF/TOF-MS analysis of the peptides resulting from the digestion of BSA with similar data resulting from the digestion of BSA glycoconjugates, followed by sequencing by MALDI-TOF/TOF-MS/MS of the glycated peptides. The product-ion scans of the protonated molecules were carried out with a MALDI-TOF/TOF-MS/MS tandem mass spectrometer equipped with a high-collision energy cell. The high-energy collision-induced dissociation (CID) spectra afforded product ions formed by fragmentation of the carbohydrate hapten and amino acid sequences conjugated with fragments of the carbohydrate hapten. We were able to identify three conjugation sites on lysine residues (Lys235, Lys437 and Lys455). It was shown that these lysine residues are very reactive and bind lysine specific reagents. We presume that these Lys residues belong to those that are considered to be sterically more accessible on the surface of the tridimensional structure. The identification of the y-series product ions was very useful for the sequencing of various peptides. The series of a- and b-product ions confirmed the sequence of the conjugated peptides.
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Affiliation(s)
- Farid Jahouh
- Department of Chemistry, Memorial University of Newfoundland, Saint John's, NL, Canada
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Syngkon A, Elluri S, Koley H, Rompikuntal PK, Saha DR, Chakrabarti MK, Bhadra RK, Wai SN, Pal A. Studies on a novel serine protease of a ΔhapAΔprtV Vibrio cholerae O1 strain and its role in hemorrhagic response in the rabbit ileal loop model. PLoS One 2010; 5. [PMID: 20927349 PMCID: PMC2948034 DOI: 10.1371/journal.pone.0013122] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Accepted: 09/03/2010] [Indexed: 01/22/2023] Open
Abstract
Background Two well-characterized proteases secreted by Vibrio cholerae O1 strains are hemagglutinin protease (HAP) and V. cholerae protease (PrtV). The hapA and prtV knock out mutant, V. cholerae O1 strain CHA6.8ΔprtV, still retains residual protease activity. We initiated this study to characterize the protease present in CHA6.8ΔprtV strain and study its role in pathogenesis in rabbit ileal loop model (RIL). Methodology/Principal Findings We partially purified the residual protease secreted by strain CHA6.8ΔprtV from culture supernatant by anion-exchange chromatography. The major protein band in native PAGE was identified by MS peptide mapping and sequence analysis showed homology with a 59-kDa trypsin-like serine protease encoded by VC1649. The protease activity was partially inhibited by 25 mM PMSF and 10 mM EDTA and completely inhibited by EDTA and PMSF together. RIL assay with culture supernatants of strains C6709 (FA ratio 1.1+/−0.3 n = 3), CHA6.8 (FA ratio 1.08+/−0.2 n = 3), CHA6.8ΔprtV (FA ratio 1.02+/−0.2 n = 3) and partially purified serine protease from CHA6.8ΔprtV (FA ratio 1.2+/−0.3 n = 3) induced fluid accumulation and histopathological studies on rabbit ileum showed destruction of the villus structure with hemorrhage in all layers of the mucosa. RIL assay with culture supernatant of CHA6.8ΔprtVΔVC1649 strain (FA ratio 0.11+/−0.005 n = 3) and with protease incubated with PMSF and EDTA (FA ratio 0.3+/−0.05 n = 3) induced a significantly reduced FA ratio with almost complete normal villus structure. Conclusion Our results show the presence of a novel 59-kDa serine protease in a ΔhapAΔprtV V. cholerae O1 strain and its role in hemorrhagic response in RIL model.
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Affiliation(s)
- Aurelia Syngkon
- Divisions of Pathophysiology, National Institute of Cholera and Enteric Diseases, Kolkata, West Bengal, India
| | - Sridhar Elluri
- Divisions of Pathophysiology, National Institute of Cholera and Enteric Diseases, Kolkata, West Bengal, India
- Department of Molecular Biology, Umeå Centre for Microbial Research (UCMR), Umeå University, Umeå, Sweden
| | - Hemanta Koley
- Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, West Bengal, India
| | - Pramod K. Rompikuntal
- Department of Molecular Biology, Umeå Centre for Microbial Research (UCMR), Umeå University, Umeå, Sweden
| | - Dhira Rani Saha
- Division of Histology and Electron Microscopy, National Institute of Cholera and Enteric Diseases, Kolkata, West Bengal, India
| | - Manoj K. Chakrabarti
- Divisions of Pathophysiology, National Institute of Cholera and Enteric Diseases, Kolkata, West Bengal, India
| | - Rupak K. Bhadra
- Infectious Diseases and Immunology Division, Indian Institute of Chemical Biology, Kolkata, West Bengal, India
| | - Sun Nyunt Wai
- Department of Molecular Biology, Umeå Centre for Microbial Research (UCMR), Umeå University, Umeå, Sweden
| | - Amit Pal
- Divisions of Pathophysiology, National Institute of Cholera and Enteric Diseases, Kolkata, West Bengal, India
- * E-mail:
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Hou SJ, Kováč P. Enhanced stereoselectivity of alpha-mannosylation under thermodynamic control using trichloroacetimidates. Carbohydr Res 2010; 345:999-1007. [PMID: 20381793 PMCID: PMC2902152 DOI: 10.1016/j.carres.2010.03.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Revised: 03/17/2010] [Accepted: 03/18/2010] [Indexed: 10/19/2022]
Abstract
O-Specific polysaccharides of Vibrio cholerae O1, serotypes Inaba and Ogawa, consist of alpha-(1-->2)-linked N-(3-deoxy-L-glycero-tetronyl)perosamine (4-amino-4,6-dideoxy-D-mannose). The blockwise synthesis of larger fragments of such O-PSs involves oligosaccharide glycosyl donors that contain a nonparticipating 2-O-glycosyl group at the position vicinal to the anomeric center where the new glycosidic linkage is formed. Such glycosyl donors may bear at C-4 either a latent acylamino (e.g., azido) or the 3-deoxy-L-glycero-tetronamido group. While monosaccharide glycosyl donors, even those bearing a nonparticipating group at O-2 (e.g., methyl), and the 4-N-(3-deoxy-L-glycero-tetronyl) side chain form alpha-linked oligosaccharides with excellent stereoselectivity, alpha-mannosylation with analogous oligosaccharide donors in this series is adversely affected by the presence of the side chain. Consequently, the unwanted beta-product is formed in a considerable amount. Conducting the reaction at elevated temperature under thermodynamic control substantially enhances formation of the alpha-linked oligosaccharide. This effect is much more pronounced when glycosyl trichloroacetimidates, rather than thioglycosides or glycosyl chlorides, are used as glycosyl donors.
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Affiliation(s)
- Shu-jie Hou
- NIDDK, LBC, National Institutes of Health, Bethesda, MD 20892-0815 (U.S.A.)
| | - Pavol Kováč
- NIDDK, LBC, National Institutes of Health, Bethesda, MD 20892-0815 (U.S.A.)
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Chmelík J, Rehulka P, Kovácik V, Pätoprstý V, Kovác P. Negative matrix-assisted laser desorption/ionization time-of-flight/time-of-flight tandem mass spectrometry fragmentation of synthetic analogs of the O-specific polysaccharide of Vibrio cholerae O:1 in the presence of anionic dopants. Eur J Mass Spectrom (Chichester) 2007; 13:347-353. [PMID: 18192728 DOI: 10.1255/ejms.891] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Oligosaccharides (tri- to hexamers) that represent terminal epitopes of O-antigens of Vibrio cholerae O:1, serotypes Ogawa and Inaba, have been studied by negative matrix-assisted laser desorption/ionization time of flight/time-of-flight mass spectrometry (MALDI ToF/ToF MS). The [M - H(+)](-) ions are formed after expulsion of a proton from molecules studied under condition of MALDI MS analysis in the negative mode. Several ammonium salts (chloride, nitrate, hydrogencarbonate and hydrogensulfate) were used as additives to increase the formation of negative ions from saccharides. The most efficient was the addition of ammonium hydrogencarbonate, which increased the amount of [M - H(+)](-) ions more than six times. Between three fragmentation pathways, the new conjugated transfer of electrons within the second downstream unit of oligosaccharides was discovered. Production of these ions, which has not been observed in any other kinds of measurement, distinguishes substances belonging to Ogawa and Inaba serotypes. The negative MALDI ToF/ToF mass spectra are simpler and, at the same time, more informative, as compared with positive and negative electrospray ionization ion trap as well as with positive MALDI ToF/ToF analysis.
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Affiliation(s)
- Josef Chmelík
- Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic, Veverí 97, 611 42 Brno, Czech Republic
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Wade TK, Saksena R, Shiloach J, Kovác P, Wade WF. Immunogenicity of synthetic saccharide fragments of Vibrio cholerae O1 (Ogawa and Inaba) bound to Exotoxin A. FEMS Immunol Med Microbiol 2006; 48:237-51. [PMID: 17010106 DOI: 10.1111/j.1574-695x.2006.00143.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Recombinant exotoxin A (rEPA) from Pseudomonas aeruginosa conjugated to Vibrio cholerae O1 serotype-specific polysaccharides (mono-, di- and hexasaccharide) were immunogenic in mice. Monosaccharide conjugates boosted the humoral responses to the hexasaccharide conjugates. Prior exposure to purified Ogawa lipopolysaccharide (LPS) enabled contra-serotype hexasaccharide conjugates to boost the vibriocidal response, but Inaba LPS did not prime for an enhanced vibriocidal response by a contra-serotype conjugate. Prior exposure to the carrier, and priming B cells with the LPS of either serotype, resulted in enhanced vibriocidal titers if the Ogawa hexasaccharides were used, but a diminished response to the Inaba LPS. These studies demonstrate that the 'functional' B cell epitopes on the LPS differ from those of the neoglycoconjugates and that the order of immunization and the serotype of the boosting conjugate can influence the epitope specificity and function of the antisera.
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Affiliation(s)
- Terri K Wade
- Department of Microbiology and Immunology, Dartmouth Medical School, Lebanon, NH 03756, USA.
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Kovácik V, Bekesová S, Pätoprstý V, Rehulka P, Chmelík J, Kovác P. Positive-ion fragmentation in matrix-assisted laser desorption/ionization tandem time of flight mass spectrometry of synthetic analogs of the O-specific polysaccharide of Vibrio cholerae O:1. Eur J Mass Spectrom (Chichester) 2006; 12:247-52. [PMID: 17057281 DOI: 10.1255/ejms.807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Saccharides (mono- to hexamers) that mimic the terminal epitopes of O-antigens of Vibrio cholerae O:1, serotypes Ogawa and Inaba have been studied by matrix-assisted laser desorption/ionization tandem time-of-flight (MALDI ToF/ToF) mass spectrometry (MS). Cationized adducts are the characteristic ions formed through the capture of sodium or potassium cations under MALDI MS conditions. Three characteristic pathways dominate in the fragmentation of model substances under MALDI ToF/ToF collision-induced dissociation MS/MS conditions of measurement. The first is the elimination which shortens the length of the oligosaccharide. In this way, conversion of the Ogawa to Inaba fragments takes place under the conditions of measurement. In the second, the conjugated transfer of electrons in the upstream unit of oligosaccharides takes place. The third route brings about the elimination of one alpha-hydroxy-gamma-butyrolactone molecule from the 4-(3-deoxy-L-glycero-tetronamido) group. The MALDI ToF/ToF MS/MS provided sufficient information about molecular mass, the number of saccharide residues, the structure of saccharides, the C(4)- amide of 3-deoxy-L-glycero-tetronic acid (DGT) of the compounds investigated, and allows to distinguish between Ogawa and Inaba serotypes.
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Affiliation(s)
- Vladimír Kovácik
- Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38 Bratislava, Slovakia.
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Machová E, Bystrický S, Gáliková A, Kogan G. Preparation of a subcellular conjugate with the lipopolysaccharide from Vibrio cholerae 01 using beta-D-glucan as matrix. Eur J Med Chem 2002; 37:681-7. [PMID: 12161065 DOI: 10.1016/s0223-5234(02)01392-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A conjugate consisting of detoxified lipopolysaccharide of Vibrio cholerae, a carrier polysaccharide matrix and an immunogenic protein has been synthesised and the reaction conditions have been optimised for obtaining a high degree of conjugation. The obtained construct showed reactivity with the antibodies against V. cholerae and can serve as a prospective candidate for preparation of subcellular anti-cholera vaccine.
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Affiliation(s)
- Eva Machová
- Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 842 38 Bratislava, Slovakia.
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