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Hou S, Kováč P. Synthesis of the conjugation ready, downstream disaccharide fragment of the O-PS of Vibrio cholerae O:139. Carbohydr Res 2011; 346:1394-7. [PMID: 21641585 DOI: 10.1016/j.carres.2011.02.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 02/08/2011] [Accepted: 02/09/2011] [Indexed: 10/18/2022]
Abstract
The linker-equipped disaccharide, 8-amino-3,6-dioxaoctyl 2,6-dideoxy-2-acetamido-3-O-β-D-galactopyranosyluronate-β-D-glucopyranoside (10), was synthesized in eight steps from acetobromogalactose and ethyl 4,6-O-benzylidene-2-deoxy-2-trichloroacetamido-1-thio-β-D-glucopyranoside. The hydroxyl group present at C-4(II) in the last intermediate, 8-azido-3,6-dioxaoctyl 4-O-benzyl-6-bromo-2,6-dideoxy-2-trichloroacetamido-3-O-(benzyl 2,3-di-O-benzyl-β-D-galactopyranosyluronate)-β-D-glucopyranoside (9), is positioned to allow further build-up of the molecule and, eventually, construction of the complete hexasaccharide. Global deprotection (9→10) was done in one step by catalytic hydrogenolysis over palladium-on-charcoal.
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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. JOURNAL OF MASS SPECTROMETRY : JMS 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] [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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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] [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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Kováč P, Hou S. Conjugation-Amenable Tetrasaccharide of the Side Chain of the Major Glycoprotein of the Bacillus anthracis Exosporium: A Large-Scale Preparation. SYNTHESIS-STUTTGART 2009. [DOI: 10.1055/s-0028-1083338] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Parthasarathy N, Saksena R, Kováč P, Deshazer D, Peacock SJ, Wuthiekanun V, Heine HS, Friedlander AM, Cote CK, Welkos SL, Adamovicz JJ, Bavari S, Waag DM. Application of carbohydrate microarray technology for the detection of Burkholderia pseudomallei, Bacillus anthracis and Francisella tularensis antibodies. Carbohydr Res 2008; 343:2783-8. [PMID: 18558401 DOI: 10.1016/j.carres.2008.05.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2008] [Revised: 05/19/2008] [Accepted: 05/24/2008] [Indexed: 10/22/2022]
Abstract
We developed a microarray platform by immobilizing bacterial 'signature' carbohydrates onto epoxide modified glass slides. The carbohydrate microarray platform was probed with sera from non-melioidosis and melioidosis (Burkholderia pseudomallei) individuals. The platform was also probed with sera from rabbits vaccinated with Bacillus anthracis spores and Francisella tularensis bacteria. By employing this microarray platform, we were able to detect and differentiate B. pseudomallei, B. anthracis and F. tularensis antibodies in infected patients, and infected or vaccinated animals. These antibodies were absent in the sera of naïve test subjects. The advantages of the carbohydrate microarray technology over the traditional indirect hemagglutination and microagglutination tests for the serodiagnosis of melioidosis and tularemia are discussed. Furthermore, this array is a multiplex carbohydrate microarray for the detection of all three biothreat bacterial infections including melioidosis, anthrax and tularemia with one, multivalent device. The implication is that this technology could be expanded to include a wide array of infectious and biothreat agents.
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Hou S, Kováč P. A Convenient Synthesis of Furanose-FreeD-Fucose Per-O-Acetates and a Precursor for Anthrose. European J Org Chem 2008. [DOI: 10.1002/ejoc.200701173] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Daves DG, Kováč P, Glaudemans CP. Synthesis of the 4-Deoxy-2-Deutero-4-Fluoro Analog of Methyl O-β-D-Galactopyranosyl-(1→6)-β-D-Galactopyranoside. J Carbohydr Chem 2008. [DOI: 10.1080/07328309008545801] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ruttens B, Saksena R, Kováč P. Synthesis of Phosphorylated, Conjugation-Ready Di-, Tri- and Tetrasaccharide Fragments of the O-Specific Polysaccharide ofV. cholerae O139. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700322] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bruyn AD, Anteunis M, Rijsbergen RV, Claeyssens M, Kováč P. 1H NMR Study of Methyl O-Acetyl-α-and-β-D-Xylopyranosides Conformational Studies and Non Additivity of1H-Shift Increments. J Carbohydr Chem 2007. [DOI: 10.1080/07328308208085102] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Adamo R, Kováč P. Glycosylation under Thermodynamic Control: Synthesis of the Di- and the Hexasaccharide Fragments of the O-SP ofVibrio Cholerae O:1 Serotype Ogawa from Fully Functionalized Building Blocks. European J Org Chem 2007. [DOI: 10.1002/ejoc.200600851] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kováč P, Glaudemans CP. Synthesis of Specifically Fluorinated Methyl β-Glycosides of (1→6)-β-D-Galactooligosaccharides II. Methyl 4-Deoxy-4-fluoro-6-O-(β-D-galactopyranosyl)-β-D-galactopyranoside. J Carbohydr Chem 2006. [DOI: 10.1080/07328308408058826] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kováčik V, Bekešová S, Tvaroška I, Kováč P. Positive electrospray ion trap multistage mass spectrometric fragmentation of synthetic analogs of saccharide part of lipopolysaccharides of Vibrio cholerae O:1. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2006; 17:749-756. [PMID: 16600622 DOI: 10.1016/j.jasms.2006.02.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2006] [Revised: 02/08/2006] [Accepted: 02/09/2006] [Indexed: 05/08/2023]
Abstract
Oligosaccharides (mono- to hexamers) that mimic the terminal epitopes of O-antigens of Vibrio cholerae O:1, serotypes Ogawa and Inaba, have been studied by electrospray ion trap (ESI IT) mass spectrometry. Sodium or potassium-cationized adducts are characteristic ions under the conditions of ESI-MS analysis. The tentative pathways of fragmentation have been proven by multistage ion trap MS (MS(n), n = 1-3). The predominant pathway of fragmentation of the oligomers is the neutral loss of monosaccharide residue shortening the length of the oligosaccharide. In this way, conversion of the Ogawa to Inaba fragments takes place under the conditions of measurement. ESI MS/MS provided sufficient information about molecular mass, the number of saccharide residues, and the structure of saccharides, about 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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Adamo R, Kováč P. Formation of Ethyl 1-Thiomannopyranosides from 2-O-Chloroacetylated and 2-O-Levulinoylated Synthons. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600139] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Adamo R, Saksena R, Kováč P. Studies towards a Conjugate Vaccine for Anthrax: Synthesis of the Tetrasaccharide Side Chain of theBacillus anthracis Exosporium. Helv Chim Acta 2006. [DOI: 10.1002/hlca.200690106] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Ruttens B, Kováč P. Synthesis of a Phosphorylated Disaccharide Fragment of the O-Specific Polysaccharide ofVibrio cholerae O139, Functionalized for Conjugation. Helv Chim Acta 2006. [DOI: 10.1002/hlca.200690036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kováč P, Ruttens B. A Facile Synthesis of Armed and Disarmed Colitose Thioglycosides. SYNTHESIS-STUTTGART 2004. [DOI: 10.1055/s-2004-831206] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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67
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Saksena R, Zhang J, Kováč P. SYNTHESIS OF 2-(TRIMETHYLSILYL)ETHYL α-d-MANNOPYRANOSIDES REVISITED. J Carbohydr Chem 2002. [DOI: 10.1081/car-120016846] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kováč M, Bielik M, Hók J, Kováč P, Kronome B, Labák P, Mozco P, Plašienka D, Šefara J, Šujan M. Seismic activity and neotectonic evolution of theWestern Carpathians (Slovakia). ACTA ACUST UNITED AC 2002. [DOI: 10.5194/smsps-3-167-2002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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69
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Chang AH, Horton D, Kováč P. Syntheses of fluorinated ligands to probe binding of antigenic determinants of Vibrio cholerae O:1, serotypes Inaba and Ogawa, to antibodies. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0957-4166(99)00505-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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70
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Schengrund CL, Kováč P. A simple, nonenzymatic method for desialylating polysialylated ganglio-N-tetraose series gangliosides to produce GM1. J Lipid Res 1999. [DOI: 10.1016/s0022-2275(20)33351-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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71
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Zhang J, Kováč P. An Alternative Method for Regioselective, Anomeric Deacylation of Fully Acylated Carbohydrates. J Carbohydr Chem 1999. [DOI: 10.1080/07328309908544010] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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72
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Zhang J, Yergey A, Kowalak J, Kováč P. Linking carbohydrates to proteins using N-(2,2-dimethoxyethyl)-6-hydroxy hexanamide. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)83039-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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73
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Zhang J, Kováč P. Synthesis of Some Analogs of the Methyl α-Glycoside of the Presumed Antigenic Determinant of the O-Specific Polysaccharide ofVibrio choleraeO:1, Serotype Ogawa. J Carbohydr Chem 1998. [DOI: 10.1080/07328309808002896] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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74
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Zhang J, Kováč P. N-(2,2-dimethoxyethyl)-, N-(2,2-diethoxyethyl)-, and N-(4,4-diethoxybutyl)-6-hydroxy hexanamides as new linking agents for carbohydrates and proteins. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(97)10787-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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75
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Hodosi G, Kováč P. A Fundamentally New, Simple, Stereospecific Synthesis of Oligosaccharides Containing the β-Mannopyranosyl and β-Rhamnopyranosyl Linkage. J Am Chem Soc 1997. [DOI: 10.1021/ja964021y] [Citation(s) in RCA: 103] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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