1
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Kooner AS, Yu H, Leviatan Ben-Arye S, Padler-Karavani V, Chen X. Broad-Spectrum Legionaminic Acid-Specific Antibodies in Pooled Human IgGs Revealed by Glycan Microarrays with Chemoenzymatically Synthesized Nonulosonosides. Molecules 2024; 29:3980. [PMID: 39203058 PMCID: PMC11356810 DOI: 10.3390/molecules29163980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2024] [Revised: 08/10/2024] [Accepted: 08/14/2024] [Indexed: 09/03/2024] Open
Abstract
The presence and the level of antibodies in human sera against bacterial glycans are indications of prior encounters with similar antigens and/or the bacteria that express them by the immune system. An increasing number of pathogenic bacteria that cause human diseases have been shown to express polysaccharides containing a bacterial nonulosonic acid called 5,7-di-N-acetyllegionaminic acid (Leg5,7Ac2). To investigate the immune recognition of Leg5,7Ac2, which is critical for the fight against bacterial infections, a highly effective chemoenzymatic synthon strategy was applied to construct a library of α2-3/6-linked Leg5,7Ac2-glycans via their diazido-derivatives (Leg5,7diN3-glycans) formed by efficient one-pot three-enzyme (OP3E) synthetic systems from a diazido-derivative of a six-carbon monosaccharide precursor. Glycan microarray studies using this synthetic library of a Leg5,7Ac2-capped collection of diverse underlying glycan carriers and their matched sialoside counterparts revealed specific recognition of Leg5,7Ac2 by human IgG antibodies pooled from thousands of healthy donors (IVIG), suggesting prior human encounters with Leg5,7Ac2-expressing pathogenic bacteria at the population level. These biologically relevant Leg5,7Ac2-glycans and their immune recognition assays are important tools to begin elucidating their biological roles, particularly in the context of infection and host-pathogen interactions.
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Affiliation(s)
- Anoopjit Singh Kooner
- Department of Chemistry, University of California, Davis, CA 95616, USA; (A.S.K.); (H.Y.)
| | - Hai Yu
- Department of Chemistry, University of California, Davis, CA 95616, USA; (A.S.K.); (H.Y.)
| | - Shani Leviatan Ben-Arye
- Department of Cell Research and Immunology, The Shmunis School of Biomedicine and Cancer Research, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel;
| | - Vered Padler-Karavani
- Department of Cell Research and Immunology, The Shmunis School of Biomedicine and Cancer Research, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel;
| | - Xi Chen
- Department of Chemistry, University of California, Davis, CA 95616, USA; (A.S.K.); (H.Y.)
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2
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Ding M, Sun W, Tian G, Zou X, Hu J, Qin C, Yin J. Chemical Synthesis of an Orthogonally Protected 5,7-Diamino-3,5,7,9-tetradeoxy-d-glycero-l-gluco-2-nonulosonic Acid from N-Acetylneuraminic Acid. Org Lett 2024; 26:5215-5219. [PMID: 38861677 DOI: 10.1021/acs.orglett.4c01861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
Bacterial nonulosonic acids (NulOs), which feature a nine-carbon backbone, are associated with the biological functions of bacterial glycans. Here, an orthogonally protected 5-amino-7-azido-3,5,7,9-tetradeoxy-d-glycero-l-gluco-2-nonulosonic acid related to Fusobacterium nucleatum ATCC 23726 NulO was synthesized from N-acetylneuraminic acid with sequential performance of C5,7 azidation, C9 deoxygenation, C4 epimerization, and N5,7 differentiation. The C5 azido group in the obtained 5,7-diazido-NulO can be regioselectively reduced to differentiate the two amino groups.
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Affiliation(s)
- Meiru Ding
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Wenbin Sun
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Guangzong Tian
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Xiaopeng Zou
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Jing Hu
- Wuxi School of Medicine, Jiangnan University, Wuxi 214122, China
| | - Chunjun Qin
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Jian Yin
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, School of Life Sciences and Health Engineering, Jiangnan University, Wuxi 214122, China
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3
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Vasquez O, Alibrandi A, Bennett CS. De Novo Synthetic Approach to 2,4-Diamino-2,4,6-trideoxyhexoses (DATDH): Bacterial and Rare Deoxy-Amino Sugars. Org Lett 2023; 25:7873-7877. [PMID: 37862141 PMCID: PMC10923193 DOI: 10.1021/acs.orglett.3c03106] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2023]
Abstract
A synthetic route to 2,4-diamino-2,4,6-trideoxysugar stereoisomers in 6-7 steps and 22-33% overall yield is described. A key step in this pathway is the carbonyl coupling of d- and l-threoninol or d- and l-allo-threoninol to a phthalimido-allene mediated by chiral iridium-H8-BINAP, which allows for installation of two new chiral centers in one, highly diastereoselective (>20:1 dr) step. This approach provides a more concise, diastereoselective, and versatile method to access these deoxy-amino sugars than is currently available.
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Affiliation(s)
- Olivea Vasquez
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Angela Alibrandi
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Clay S Bennett
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
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4
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Abstract
Glycans, carbohydrate molecules in the realm of biology, are present as biomedically important glycoconjugates and a characteristic aspect is that their structures in many instances are branched. In determining the primary structure of a glycan, the sugar components including the absolute configuration and ring form, anomeric configuration, linkage(s), sequence, and substituents should be elucidated. Solution state NMR spectroscopy offers a unique opportunity to resolve all these aspects at atomic resolution. During the last two decades, advancement of both NMR experiments and spectrometer hardware have made it possible to unravel carbohydrate structure more efficiently. These developments applicable to glycans include, inter alia, NMR experiments that reduce spectral overlap, use selective excitations, record tilted projections of multidimensional spectra, acquire spectra by multiple receivers, utilize polarization by fast-pulsing techniques, concatenate pulse-sequence modules to acquire several spectra in a single measurement, acquire pure shift correlated spectra devoid of scalar couplings, employ stable isotope labeling to efficiently obtain homo- and/or heteronuclear correlations, as well as those that rely on dipolar cross-correlated interactions for sequential information. Refined computer programs for NMR spin simulation and chemical shift prediction aid the structural elucidation of glycans, which are notorious for their limited spectral dispersion. Hardware developments include cryogenically cold probes and dynamic nuclear polarization techniques, both resulting in enhanced sensitivity as well as ultrahigh field NMR spectrometers with a 1H NMR resonance frequency higher than 1 GHz, thus improving resolution of resonances. Taken together, the developments have made and will in the future make it possible to elucidate carbohydrate structure in great detail, thereby forming the basis for understanding of how glycans interact with other molecules.
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Affiliation(s)
- Carolina Fontana
- Departamento
de Química del Litoral, CENUR Litoral Norte, Universidad de la República, Paysandú 60000, Uruguay
| | - Göran Widmalm
- Department
of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
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5
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Kim S, Oiler J, Xing Y, O'Doherty GA. De novo asymmetric Achmatowicz approach to oligosaccharide natural products. Chem Commun (Camb) 2022; 58:12913-12926. [PMID: 36321854 PMCID: PMC9710213 DOI: 10.1039/d2cc05280f] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
The development and application of the asymmetric synthesis of oligosaccharides from achiral starting materials is reviewed. This de novo asymmetric approach centers around the use of asymmetric catalysis for the synthesis of optically pure furan alcohols in conjunction with Achmatowicz oxidative rearrangement for the synthesis of various pyranones. In addition, the use of a diastereoselective palladium-catalyzed glycosylation and subsequent diastereoselective post-glycosylation transformation was used for the synthesis of oligosaccharides. The application of this approach to oligosaccharide synthesis is discussed.
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Affiliation(s)
- Sugyeom Kim
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, 02115, USA.
| | - Jeremy Oiler
- Department of Chemistry, William Paterson University, Wayne, NJ, 07470, USA
| | - Yalan Xing
- Department of Chemistry, Hofstra University, Hempstead, NY, 11549, USA.
| | - George A O'Doherty
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, 02115, USA.
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6
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Siyabalapitiya Arachchige S, Crich D. Syntheses of Legionaminic Acid, Pseudaminic Acid, Acetaminic Acid, 8- epi-Acetaminic Acid, and 8- epi-Legionaminic Acid Glycosyl Donors from N-Acetylneuraminic Acid by Side Chain Exchange. Org Lett 2022; 24:2998-3002. [PMID: 35420827 PMCID: PMC9066425 DOI: 10.1021/acs.orglett.2c00894] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Metaperiodate cleavage of the glycerol side chain from an N-acetyl neuraminic acid-derived thioglycoside and condensation with the two enantiomers of the Ellman sulfinamide afford two diastereomeric N-sulfinylimines from which bacterial sialic acid donors with the legionaminic and acetaminic acid configurations and their 8-epi-isomers are obtained by samarium iodide-mediated coupling with acetaldehyde and subsequent manipulations. A variation on the theme, with inversion of the configuration at C5, similarly provides two differentially protected pseudaminic acid donors.
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Affiliation(s)
- Sameera Siyabalapitiya Arachchige
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, Georgia 30602, United States.,Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, United States.,Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, Georgia 30602, United States
| | - David Crich
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, Georgia 30602, United States.,Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, United States.,Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, Georgia 30602, United States
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7
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Banahene N, Kavunja HW, Swarts BM. Chemical Reporters for Bacterial Glycans: Development and Applications. Chem Rev 2022; 122:3336-3413. [PMID: 34905344 PMCID: PMC8958928 DOI: 10.1021/acs.chemrev.1c00729] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Bacteria possess an extraordinary repertoire of cell envelope glycans that have critical physiological functions. Pathogenic bacteria have glycans that are essential for growth and virulence but are absent from humans, making them high-priority targets for antibiotic, vaccine, and diagnostic development. The advent of metabolic labeling with bioorthogonal chemical reporters and small-molecule fluorescent reporters has enabled the investigation and targeting of specific bacterial glycans in their native environments. These tools have opened the door to imaging glycan dynamics, assaying and inhibiting glycan biosynthesis, profiling glycoproteins and glycan-binding proteins, and targeting pathogens with diagnostic and therapeutic payload. These capabilities have been wielded in diverse commensal and pathogenic Gram-positive, Gram-negative, and mycobacterial species─including within live host organisms. Here, we review the development and applications of chemical reporters for bacterial glycans, including peptidoglycan, lipopolysaccharide, glycoproteins, teichoic acids, and capsular polysaccharides, as well as mycobacterial glycans, including trehalose glycolipids and arabinan-containing glycoconjugates. We cover in detail how bacteria-targeting chemical reporters are designed, synthesized, and evaluated, how they operate from a mechanistic standpoint, and how this information informs their judicious and innovative application. We also provide a perspective on the current state and future directions of the field, underscoring the need for interdisciplinary teams to create novel tools and extend existing tools to support fundamental and translational research on bacterial glycans.
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Affiliation(s)
- Nicholas Banahene
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, United States
- Biochemistry, Cell, and Molecular Biology Program, Central Michigan University, Mount Pleasant, MI, United States
| | - Herbert W. Kavunja
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, United States
- Biochemistry, Cell, and Molecular Biology Program, Central Michigan University, Mount Pleasant, MI, United States
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8
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Meng X, Boons GJ, Wösten MMSM, Wennekes T. Metabolic Labeling of Legionaminic Acid in Flagellin Glycosylation of Campylobacter jejuni Identifies Maf4 as a Putative Legionaminyl Transferase. Angew Chem Int Ed Engl 2021; 60:24811-24816. [PMID: 34519150 PMCID: PMC9298399 DOI: 10.1002/anie.202107181] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Indexed: 12/19/2022]
Abstract
Campylobacter jejuni is the major human food‐borne pathogen. Its bipolar flagella are heavily O‐glycosylated with microbial sialic acids and essential for its motility and pathogenicity. However, both the glycosylation of flagella and the exact contribution of legionaminic acid (Leg) to flagellar activity is poorly understood. Herein, we report the development of a metabolic labeling method for Leg glycosylation on bacterial flagella with probes based on azide‐modified Leg precursors. The hereby azido‐Leg labeled flagellin could be detected by Western blot analysis and imaged on intact bacteria. Using the probes on C. jejuni and its isogenic maf4 mutant we also further substantiated the identification of Maf4 as a putative Leg glycosyltransferase. Further evidence was provided by UPLC–MS detection of labeled CMP‐Leg and an in silico model of Maf4. This method and the developed probes will facilitate the study of Leg glycosylation and the functional role of this modification in C. jejuni motility and invasiveness.
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Affiliation(s)
- Xianke Meng
- Department of Chemical Biology and Drug Discovery, Utrecht Institute for Pharmaceutical Sciences and Bijvoet Center for Biomolecular Research, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
| | - Geert-Jan Boons
- Department of Chemical Biology and Drug Discovery, Utrecht Institute for Pharmaceutical Sciences and Bijvoet Center for Biomolecular Research, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands.,Complex Carbohydrate Research Center and Department of Chemistry, University of Georgia, 315 Riverbend Road, Athens, GA, 30602, USA
| | - Marc M S M Wösten
- Department Biomolecular Health Sciences, Utrecht University, Yalelaan 1, 3584 CL, Utrecht, The Netherlands
| | - Tom Wennekes
- Department of Chemical Biology and Drug Discovery, Utrecht Institute for Pharmaceutical Sciences and Bijvoet Center for Biomolecular Research, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
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9
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Meng X, Boons G, Wösten MMSM, Wennekes T. Metabolic Labeling of Legionaminic Acid in Flagellin Glycosylation of
Campylobacter jejuni
Identifies Maf4 as a Putative Legionaminyl Transferase. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xianke Meng
- Department of Chemical Biology and Drug Discovery Utrecht Institute for Pharmaceutical Sciences and Bijvoet Center for Biomolecular Research Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
| | - Geert‐Jan Boons
- Department of Chemical Biology and Drug Discovery Utrecht Institute for Pharmaceutical Sciences and Bijvoet Center for Biomolecular Research Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
- Complex Carbohydrate Research Center and Department of Chemistry University of Georgia 315 Riverbend Road Athens GA 30602 USA
| | - Marc M. S. M. Wösten
- Department Biomolecular Health Sciences Utrecht University Yalelaan 1 3584 CL Utrecht The Netherlands
| | - Tom Wennekes
- Department of Chemical Biology and Drug Discovery Utrecht Institute for Pharmaceutical Sciences and Bijvoet Center for Biomolecular Research Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
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10
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Kooner AS, Diaz S, Yu H, Santra A, Varki A, Chen X. Chemoenzymatic Synthesis of Sialosides Containing 7- N- or 7,9-Di- N-acetyl Sialic Acid as Stable O-Acetyl Analogues for Probing Sialic Acid-Binding Proteins. J Org Chem 2021; 86:14381-14397. [PMID: 34636559 DOI: 10.1021/acs.joc.1c01091] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel chemoenzymatic synthon strategy has been developed to construct a comprehensive library of α2-3- and α2-6-linked sialosides containing 7-N- or 7,9-di-N-acetyl sialic acid, the stable analogue of naturally occurring 7-O-acetyl- or 7,9-di-O-acetyl-sialic acid. Diazido and triazido-mannose derivatives that were readily synthesized chemically from inexpensive galactose were shown to be effective chemoenzymatic synthons. Together with bacterial sialoside biosynthetic enzymes with remarkable substrate promiscuity, they were successfully used in one-pot multienzyme (OPME) sialylation systems for highly efficient synthesis of sialosides containing multiple azido groups. Conversion of the azido groups to N-acetyl groups generated the desired sialosides. The hydrophobic and UV-detectable benzyloxycarbonyl (Cbz) group introduced in the synthetic acceptors of sialyltransferases was used as a removable protecting group for the propylamine aglycon of the target sialosides. The resulting N-acetyl sialosides were novel stable probes for sialic acid-binding proteins such as plant lectin MAL II, which bond strongly to sialyl T antigens with or without an N-acetyl at C7 or at both C7 and C9 in the sialic acid.
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Affiliation(s)
- Anoopjit Singh Kooner
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Sandra Diaz
- Department of Medicine, University of California, San Diego, California 92093, United States.,Department of Cellular & Molecular Medicine, Glycobiology Research and Training Center, University of California, San Diego, California 92093, United States
| | - Hai Yu
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Abhishek Santra
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Ajit Varki
- Department of Medicine, University of California, San Diego, California 92093, United States.,Department of Cellular & Molecular Medicine, Glycobiology Research and Training Center, University of California, San Diego, California 92093, United States
| | - Xi Chen
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
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11
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Vibhute AM, Tamai H, Logviniuk D, Jones PG, Fridman M, Werz DB. Azide-Functionalized Derivatives of the Virulence-Associated Sugar Pseudaminic Acid: Chiral Pool Synthesis and Labeling of Bacteria. Chemistry 2021; 27:10595-10600. [PMID: 33769621 PMCID: PMC8360151 DOI: 10.1002/chem.202100443] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Indexed: 12/19/2022]
Abstract
Pseudaminic acid (Pse) is a significant prokaryotic monosaccharide found in important Gram-negative and Gram-positive bacteria. This unique sugar serves as a component of cell-surface-associated glycans or glycoproteins and is associated with their virulence. We report the synthesis of azidoacetamido-functionalized Pse derivatives as part of a search for Pse-derived metabolic labeling reagents. The synthesis was initiated with d-glucose (Glc), which served as a cost-effective chiral pool starting material. Key synthetic steps involve the conversion of C1 of Glc into the terminal methyl group of Pse, and inverting deoxyaminations at C3 and C5 of Glc followed by backbone elongation with a three-carbon unit using the Barbier reaction. Metabolic labeling experiments revealed that, of the four Pse derivatives, ester-protected C5 azidoacetamido-Pse successfully labeled cells of Pse-expressing Gram-positive and Gram-negative strains. No labeling was observed in cells of non-Pse-expressing strains. The ester-protected and C5 azidoacetamido-functionalized Pse is thus a useful reagent for the identification of bacteria expressing this unique virulence-associated nonulosonic acid.
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Affiliation(s)
- Amol M Vibhute
- Technische Universität Braunschweig, Institute of Organic Chemistry, Hagenring 30, 38106, Braunschweig, Germany
| | - Hideki Tamai
- Technische Universität Braunschweig, Institute of Organic Chemistry, Hagenring 30, 38106, Braunschweig, Germany
| | - Dana Logviniuk
- School of Chemistry, Raymond and Beverley Sackler Faculty of Exact Sciences, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Peter G Jones
- Technische Universität Braunschweig, Institute of Inorganic and Analytical Chemistry, Hagenring 30, 38106, Braunschweig, Germany
| | - Micha Fridman
- School of Chemistry, Raymond and Beverley Sackler Faculty of Exact Sciences, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Daniel B Werz
- Technische Universität Braunschweig, Institute of Organic Chemistry, Hagenring 30, 38106, Braunschweig, Germany
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12
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Niedzwiecka A, Sequeira C, Zhang P, Ling CC. An efficient and scalable synthesis of 2,4-di- N-acetyl- l-altrose ( l-2,4-Alt-diNAc). RSC Adv 2021; 11:11583-11594. [PMID: 35423663 PMCID: PMC8695972 DOI: 10.1039/d1ra01070k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 03/12/2021] [Indexed: 12/17/2022] Open
Abstract
An efficient and scalable synthesis of pseudaminic acid precursor l-2,4-Alt-diNAc was developed from l-fucose. The desired l-altro configuration and N-acetamido substitutions ensued from a sequence of highly regio- and stereoselective transformations.
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Affiliation(s)
| | | | - Ping Zhang
- Department of Chemistry
- University of Calgary
- Calgary
- Canada
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13
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Affiliation(s)
- Kabita Pradhan
- Department of Chemistry Indian Institute of Technology Bombay 400076 Powai Mumbai India
| | - Suvarn S. Kulkarni
- Department of Chemistry Indian Institute of Technology Bombay 400076 Powai Mumbai India
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14
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Flack EKP, Chidwick HS, Best M, Thomas GH, Fascione MA. Synthetic Approaches for Accessing Pseudaminic Acid (Pse) Bacterial Glycans. Chembiochem 2020; 21:1397-1407. [PMID: 31944494 DOI: 10.1002/cbic.202000019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Indexed: 12/18/2022]
Abstract
Pseudaminic acids (Pses) are a group of non-mammalian nonulosonic acids (nulOs) that have been shown to be an important virulence factor for a number of pathogenic bacteria, including emerging multidrug-resistant ESKAPE pathogens. Despite their discovery over 30 years ago, relatively little is known about the biological significance of Pse glycans compared with their sialic acid analogues, primarily due to a lack of access to the synthetically challenging Pse architecture. Recently, however, the Pse backbone has been subjected to increasing synthetic exploration by carbohydrate (bio)chemists, and the total synthesis of complex Pse glycans achieved with inspiration from the biosynthesis and subsequent detailed study of chemical glycosylation by using Pse donors. Herein, context is provided for these efforts by summarising recent synthetic approaches pioneered for accessing Pse glycans, which are set to open up this underexplored area of glycoscience to the wider scientific community.
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Affiliation(s)
- Emily K P Flack
- Department of Chemistry, University of York, Heslington Road, Heslington, York, YO10 5DD, UK
| | - Harriet S Chidwick
- Department of Chemistry, University of York, Heslington Road, Heslington, York, YO10 5DD, UK
| | - Matthew Best
- Department of Chemistry, University of York, Heslington Road, Heslington, York, YO10 5DD, UK
| | - Gavin H Thomas
- Department of Biology, University of York, Heslington Road, Heslington, York, YO10 5DD, UK
| | - Martin A Fascione
- Department of Chemistry, University of York, Heslington Road, Heslington, York, YO10 5DD, UK
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15
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Casillo A, Ricciardelli A, Parrilli E, Tutino ML, Corsaro MM. Cell-wall associated polysaccharide from the psychrotolerant bacterium Psychrobacter arcticus 273-4: isolation, purification and structural elucidation. Extremophiles 2019; 24:63-70. [PMID: 31309337 DOI: 10.1007/s00792-019-01113-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 07/01/2019] [Indexed: 01/27/2023]
Abstract
In this paper, the structure of the capsular polysaccharide isolated from the psychrotolerant bacterium Psychrobacter arcticus 273-4 is reported. The polymer was purified by gel filtration chromatography and the structure was elucidated by means of one- and two-dimensional NMR spectroscopy, in combination with chemical analyses. The polysaccharide consists of a trisaccharidic repeating unit containing two residues of glucose and a residue of a N,N-diacetyl-pseudaminic acid.
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Affiliation(s)
- Angela Casillo
- Department of Chemical Sciences, Università degli Studi di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia, 80126, Naples, Italy.
| | - Annarita Ricciardelli
- Department of Chemical Sciences, Università degli Studi di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia, 80126, Naples, Italy
| | - Ermenegilda Parrilli
- Department of Chemical Sciences, Università degli Studi di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia, 80126, Naples, Italy
| | - Maria Luisa Tutino
- Department of Chemical Sciences, Università degli Studi di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia, 80126, Naples, Italy
| | - Maria Michela Corsaro
- Department of Chemical Sciences, Università degli Studi di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia, 80126, Naples, Italy.
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16
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Wei R, Liu H, Tang AH, Payne RJ, Li X. A Solution to Chemical Pseudaminylation via a Bimodal Glycosyl Donor for Highly Stereocontrolled α- and β-Glycosylation. Org Lett 2019; 21:3584-3588. [DOI: 10.1021/acs.orglett.9b00990] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Ruohan Wei
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, P. R. China
| | - Han Liu
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, P. R. China
| | - Arthur H. Tang
- School of Chemistry, The University of Sydney, Sydney, Australia
| | - Richard J. Payne
- School of Chemistry, The University of Sydney, Sydney, Australia
| | - Xuechen Li
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, P. R. China
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17
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Abstract
Sialic acids are cytoprotectors, mainly localized on the surface of cell membranes with multiple and outstanding cell biological functions. The history of their structural analysis, occurrence, and functions is fascinating and described in this review. Reports from different researchers on apparently similar substances from a variety of biological materials led to the identification of a 9-carbon monosaccharide, which in 1957 was designated "sialic acid." The most frequently occurring member of the sialic acid family is N-acetylneuraminic acid, followed by N-glycolylneuraminic acid and O-acetylated derivatives, and up to now over about 80 neuraminic acid derivatives have been described. They appeared first in the animal kingdom, ranging from echinoderms up to higher animals, in many microorganisms, and are also expressed in insects, but are absent in higher plants. Sialic acids are masks and ligands and play as such dual roles in biology. Their involvement in immunology and tumor biology, as well as in hereditary diseases, cannot be underestimated. N-Glycolylneuraminic acid is very special, as this sugar cannot be expressed by humans, but is a xenoantigen with pathogenetic potential. Sialidases (neuraminidases), which liberate sialic acids from cellular compounds, had been known from very early on from studies with influenza viruses. Sialyltransferases, which are responsible for the sialylation of glycans and elongation of polysialic acids, are studied because of their significance in development and, for instance, in cancer. As more information about the functions in health and disease is acquired, the use of sialic acids in the treatment of diseases is also envisaged.
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Affiliation(s)
- Roland Schauer
- Biochemisches Institut, Christian-Albrechts-Universität zu Kiel, Kiel, Germany.
| | - Johannis P Kamerling
- Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands.
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18
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Dhakal B, Crich D. Synthesis and Stereocontrolled Equatorially Selective Glycosylation Reactions of a Pseudaminic Acid Donor: Importance of the Side-Chain Conformation and Regioselective Reduction of Azide Protecting Groups. J Am Chem Soc 2018; 140:15008-15015. [PMID: 30351022 DOI: 10.1021/jacs.8b09654] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Pseudaminic acid is an amino deoxy sialic acid whose glycosides are essential components of many pathogenic Gram-negative bacterial cell walls including those from Pseudomonas aeruginosa, Vibrio cholerae, Campylobacter jejuni, Campylobacter coli, Vibrio vulnificus, and Pseudoalteromonas distincta. The study of pseudaminic acid glycosides is however hampered by poor availability from nature and the paucity of good synthetic methods and limited to no understanding of the factors controlling stereoselectivity. Conformational analysis of the side chains of various stereoisomeric sialic acids suggested that the side chain of pseudaminic acid would take up the most electron-withdrawing trans, gauche-conformation, as opposed to the gauche, gauche conformation of N-acetyl neuraminic acid and the gauche, trans-conformtion of 7- epi N-acetyl neuraminic acid, leading to the prediction of high equatorial selectivity. This prediction is borne out by the synthesis of a suitably protected pseudaminic acid donor from N-acetyl neuraminic acid in 20 steps and 5% overall yield and by the exquisite equatorial selectivity it displays in coupling reactions with typical glycosyl acceptors. The selectivity of the glycosylation reactions is further buttressed by the development and implementation of conditions for the regioselective release of the two amines from the corresponding azides, such as required for the preparation of the lipopolysaccharides. These findings open the way to the synthesis and study of pseudaminic acid-based bacterial lipopolysaccharides and, importantly in the broader context of glycosylation reactions in general, underline the significant role played by side-chain conformation in the control of reactivity and selectivity.
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Affiliation(s)
- Bibek Dhakal
- Department of Chemistry , Wayne State University , 5101 Cass Avenue , Detroit , Michigan 48202 , United States
| | - David Crich
- Department of Chemistry , Wayne State University , 5101 Cass Avenue , Detroit , Michigan 48202 , United States
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19
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Santra A, Xiao A, Yu H, Li W, Li Y, Ngo L, McArthur JB, Chen X. A Diazido Mannose Analogue as a Chemoenzymatic Synthon for Synthesizing Di-N
-acetyllegionaminic Acid-Containing Glycosides. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Abhishek Santra
- Department of Chemistry; University of California, Davis; One Shields Avenue Davis CA 95616 USA
| | - An Xiao
- Department of Chemistry; University of California, Davis; One Shields Avenue Davis CA 95616 USA
| | - Hai Yu
- Department of Chemistry; University of California, Davis; One Shields Avenue Davis CA 95616 USA
| | - Wanqing Li
- Department of Chemistry; University of California, Davis; One Shields Avenue Davis CA 95616 USA
| | - Yanhong Li
- Department of Chemistry; University of California, Davis; One Shields Avenue Davis CA 95616 USA
| | - Linh Ngo
- Department of Chemistry; University of California, Davis; One Shields Avenue Davis CA 95616 USA
| | - John B. McArthur
- Department of Chemistry; University of California, Davis; One Shields Avenue Davis CA 95616 USA
| | - Xi Chen
- Department of Chemistry; University of California, Davis; One Shields Avenue Davis CA 95616 USA
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20
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Santra A, Xiao A, Yu H, Li W, Li Y, Ngo L, McArthur JB, Chen X. A Diazido Mannose Analogue as a Chemoenzymatic Synthon for Synthesizing Di-N-acetyllegionaminic Acid-Containing Glycosides. Angew Chem Int Ed Engl 2018; 57:2929-2933. [PMID: 29349857 DOI: 10.1002/anie.201712022] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Indexed: 12/13/2022]
Abstract
A chemoenzymatic synthon was designed to expand the scope of the chemoenzymatic synthesis of carbohydrates. The synthon was enzymatically converted into carbohydrate analogues, which were readily derivatized chemically to produce the desired targets. The strategy is demonstrated for the synthesis of glycosides containing 7,9-di-N-acetyllegionaminic acid (Leg5,7Ac2 ), a bacterial nonulosonic acid (NulO) analogue of sialic acid. A versatile library of α2-3/6-linked Leg5,7Ac2 -glycosides was built by using chemically synthesized 2,4-diazido-2,4,6-trideoxymannose as a chemoenzymatic synthon for highly efficient one-pot multienzyme (OPME) sialylation followed by downstream chemical conversion of the azido groups into acetamido groups. The syntheses required 10 steps from commercially available d-fucose and had an overall yield of 34-52 %, thus representing a significant improvement over previous methods. Free Leg5,7Ac2 monosaccharide was also synthesized by a sialic acid aldolase-catalyzed reaction.
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Affiliation(s)
- Abhishek Santra
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - An Xiao
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Hai Yu
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Wanqing Li
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Yanhong Li
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Linh Ngo
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - John B McArthur
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Xi Chen
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
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21
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Carter JR, Kiefel MJ. A new approach to the synthesis of legionaminic acid analogues. RSC Adv 2018; 8:35768-35775. [PMID: 35547932 PMCID: PMC9088180 DOI: 10.1039/c8ra07771a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 10/15/2018] [Indexed: 11/21/2022] Open
Abstract
Legionaminic acid is a member of the nonulosonic acids, which are a class of sugars considered to be a virulence factor within a wide variety of pathogenic bacteria. We have developed a synthetic pathway towards C-7 analogues of legionaminic acid starting from Neu5Ac, resulting in the complete synthesis of both legionaminic acid, and its C-7 epimer, from a common precurser. Our approach involves the late-stage introduction of the requisite C-7 nitrogen functionality, thus making our strategy amenable to the introduction of a range of different amide groups at C-7 of legionaminic acid. We report the synthesis of the bacterial nonulosonic acid legionaminic acid, together with its C-7 epimer, from a common precursor derived from N-acetylneuraminic acid.![]()
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Affiliation(s)
- James R. Carter
- Institute for Glycomics
- Griffith University Gold Coast Campus
- Australia
| | - Milton J. Kiefel
- Institute for Glycomics
- Griffith University Gold Coast Campus
- Australia
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22
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Manhas S, Taylor MS. Boronic Acids as Phase-Transfer Reagents for Fischer Glycosidations in Low-Polarity Solvents. J Org Chem 2017; 82:11406-11417. [DOI: 10.1021/acs.joc.7b01880] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Sanjay Manhas
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
| | - Mark S. Taylor
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
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23
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Kenyon JJ, Notaro A, Hsu LY, De Castro C, Hall RM. 5,7-Di-N-acetyl-8-epiacinetaminic acid: A new non-2-ulosonic acid found in the K73 capsule produced by an Acinetobacter baumannii isolate from Singapore. Sci Rep 2017; 7:11357. [PMID: 28900250 PMCID: PMC5595891 DOI: 10.1038/s41598-017-11166-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 08/17/2017] [Indexed: 11/15/2022] Open
Abstract
Nonulosonic acids are found in the surface polysaccharides of many bacterial species and are often implicated in pathogenesis. Here, the structure of a novel 5,7-diacetamido-3,5,7,9-tetradeoxynon-2-ulosonic acid recovered from the capsular polysaccharide of a multiply antibiotic resistant Acinetobacter baumannii isolate was determined. The isolate carries a sugar synthesis module that differs by only a single gene from the module for the synthesis of 5,7-diacetamido-3,5,7,9-tetradeoxy-L-glycero-L-altro-non-2-ulosonic acid or 5,7-di-N-acetylacinetaminic acid, recently discovered in the capsule of another A. baumannii isolate. The new monosaccharide is the C8-epimer of acinetaminic acid (8eAci; 5,7-diacetamido-3,5,7,9-tetradeoxy-D-glycero-L-altro-non-2-ulosonic acid) and the C7-epimer of legionaminic acid. This monosaccharide had not previously been detected in a biological sample but had been synthesized chemically.
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Affiliation(s)
- Johanna J Kenyon
- School of Life and Environmental Sciences, The University of Sydney, Sydney, Australia.,Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Anna Notaro
- Department of Chemical Sciences, University of Napoli, Naples, Italy
| | - Li Yang Hsu
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore.,Department of Infectious Diseases, Tan Tock Seng Hospital, Singapore, Singapore
| | - Cristina De Castro
- Department of Agricultural Sciences, University of Napoli, Naples, Italy.
| | - Ruth M Hall
- School of Life and Environmental Sciences, The University of Sydney, Sydney, Australia.
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24
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Abstract
Legionaminic acids are analogs of sialic acid that occur in cell surface glycoconjugates of several bacteria. Because legionaminic acids share the same stereochemistry as sialic acid but differ at C7 and C9, they are interesting analogs to probe the impact of varying exocyclic moieties (C7-C9) on biological activities such as susceptibilities to sialidases, interactions with Siglecs and immunogenicity. There are currently no reports on the bacterial enzymes that transfer legionaminic acids to these cell surface glycoconjugates, but some mammalian and bacterial sialyltransferases display donor promiscuity and can use CMP-Leg5,7Ac2 efficiently enough to transfer Leg5,7Ac2 to their natural acceptor glycans. When the natural activity with CMP-Leg5,7Ac2 is significant but relatively low, an alternate strategy has been to engineer versions with improved activity to transfer Leg5,7Ac2. Importantly, we have found that some bacterial sialyltransferases are very efficient for transferring Leg5,7Ac2 to small synthetic glycans with various aglycones. The two mammalian sialyltransferases that have been tested so far (porcine ST3Gal1 and human ST6Gal1) were found to be more efficient than the bacterial sialyltransferases for the modification of glycoproteins. We provide a review of the sialyltransferases selected to modify different types of glycoconjugates with Leg5,7Ac2, including small synthetic acceptors, glycolipids, and glycoproteins. In the first part, we also propose an optimized biosynthetic pathway for in vitro preparation of the donor CMP-Leg5,7Ac2, based on enzymes selected from two bacteria that naturally produce legionaminic acid.
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25
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Liu H, Zhang Y, Wei R, Andolina G, Li X. Total Synthesis of Pseudomonas aeruginosa 1244 Pilin Glycan via de Novo Synthesis of Pseudaminic Acid. J Am Chem Soc 2017; 139:13420-13428. [DOI: 10.1021/jacs.7b06055] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Han Liu
- Department of Chemistry,
State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong
Kong SAR 999077, China
| | - Yanfeng Zhang
- Department of Chemistry,
State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong
Kong SAR 999077, China
| | - Ruohan Wei
- Department of Chemistry,
State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong
Kong SAR 999077, China
| | - Gloria Andolina
- Department of Chemistry,
State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong
Kong SAR 999077, China
| | - Xuechen Li
- Department of Chemistry,
State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong
Kong SAR 999077, China
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26
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Popik O, Dhakal B, Crich D. Stereoselective Synthesis of the Equatorial Glycosides of Legionaminic Acid. J Org Chem 2017; 82:6142-6152. [PMID: 28530837 DOI: 10.1021/acs.joc.7b00746] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The synthesis of a legionaminic acid donor from N-acetylneuraminic acid in 15 steps and 17% overall yield is described. Activation of the adamantanyl thioglycoside in the donor with N-iodosuccinimide and trifluoromethanesulfonic acid in dichloromethane and acetonitrile at -78 °C in the presence of primary, secondary and tertiary alcohols affords the corresponding glycosides in excellent yield and good to excellent equatorial selectivity. In particular, coupling to the 4-OH of a suitably protected neuraminic acid derivative affords a disaccharide that closely resembles the glycosidic linkage in the polylegionaminic acid from the lipopolysaccharide of the Legionella pneumophila virulence factor. A straightforward deprotection sequence enables conversion of the protected glycosides to the free N,N-diacetyllegionaminic acid glycosides.
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Affiliation(s)
- Oskar Popik
- Department of Chemistry, Wayne State University , Detroit, Michigan 48202, United States
| | - Bibek Dhakal
- Department of Chemistry, Wayne State University , Detroit, Michigan 48202, United States
| | - David Crich
- Department of Chemistry, Wayne State University , Detroit, Michigan 48202, United States
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27
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Dhakal B, Buda S, Crich D. Stereoselective Synthesis of 5-epi-α-Sialosides Related to the Pseudaminic Acid Glycosides. Reassessment of the Stereoselectivity of the 5-Azido-5-deacetamidosialyl Thioglycosides and Use of Triflate as Nucleophile in the Zbiral Deamination of Sialic Acids. J Org Chem 2016; 81:10617-10630. [PMID: 27806203 PMCID: PMC5148678 DOI: 10.1021/acs.joc.6b02221] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
With a view to the eventual synthesis of glycosyl donors for the stereocontrolled synthesis of pseudaminic acid glycosides, the stereocontrolled synthesis of a d-glycero-d-gulo sialic acid adamantanylthioglycoside carrying an axial azide at the 5-position is described. The synthesis employs levulinic acid as nucleophile in the oxidative deamination of an N-acetylneuraminic acid thioglycoside leading to the formation of a 3-deoxy-d-glycero-d-galacto-2-nonulosonic acid (KDN) derivative selectively protected as 5-O-levulinate. Replacement of the levulinate by triflate enables introduction of the axial azide and hence formation of the glycosyl donor. A shorter synthesis uses trifluoromethanesulfonate as nucleophile in the oxidative deamination step when the 5-O-triflyl KDN derivative is obtained directly. Glycosylation reactions conducted with the 5-azido-d-glycero-d-gulo-configured sialyl adamantanylthioglycoside at -78 °C are selective for the formation of the equatorial glycosides, suggesting that the synthesis of equatorial pseudaminic acid glycosides will be possible as suitable donors become available. A comparable N-acetylneuraminic acid adamantanylthioglycoside carrying an equatorial azide at the 5-position was also found to be selective for equatorial glycoside formation under the same conditions, suggesting that reinvestigation of other azide-protected NeuAc donors is merited. Glycosylation stereoselectivity in the d-glycero-d-gulo series is discussed in terms of the side-chain conformation of the donor.
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Affiliation(s)
- Bibek Dhakal
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA
| | - Szymon Buda
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA
| | - David Crich
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA
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28
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29
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Hassan MI, Lundgren BR, Chaumun M, Whitfield DM, Clark B, Schoenhofen IC, Boddy CN. Total Biosynthesis of Legionaminic Acid, a Bacterial Sialic Acid Analogue. Angew Chem Int Ed Engl 2016; 55:12018-21. [PMID: 27538580 DOI: 10.1002/anie.201606006] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Indexed: 02/03/2023]
Abstract
Legionaminic acid, Leg5,7Ac2 , a nonulosonic acid like 5-acetamido neuraminic acid (Neu5Ac, sialic acid), is found in cell surface glycoconjugates of bacteria including the pathogens Campylobacter jejuni, Acinetobacter baumanii and Legionella pneumophila. The presence of Leg5,7Ac2 has been correlated with virulence in humans by mechanisms that likely involve subversion of the host's immune system or interactions with host cell surfaces due to its similarity to Neu5Ac. Investigation into its role in bacterial physiology and pathogenicity is limited as there are no effective sources of it. Herein, we construct a de novo Leg5,7Ac2 biosynthetic pathway by combining multiple metabolic modules from three different microbial sources (Saccharomyces cerevisiae, C. jejuni, and L. pneumophila). Over-expression of this de novo pathway in Escherichia coli that has been engineered to lack two native catabolic pathways, enables significant quantities of Leg5,7Ac2 (≈120 mg L(-1) of culture broth) to be produced. Pure Leg5,7Ac2 could be isolated and converted into CMP-activated sugar for biochemical applications and a phenyl thioglycoside for chemical synthesis applications. This first total biosynthesis provides an essential source of Leg5,7Ac2 enabling study of its role in prokaryotic and eukaryotic glycobiology.
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Affiliation(s)
- Mohamed I Hassan
- Department of Chemistry and Biomolecular Sciences, Centre for Chemical and Synthetic Biology, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Benjamin R Lundgren
- Department of Chemistry and Biomolecular Sciences, Centre for Chemical and Synthetic Biology, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Michael Chaumun
- Department of Chemistry and Biomolecular Sciences, Centre for Chemical and Synthetic Biology, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | | | - Brady Clark
- Sussex Research Laboratories Inc., Ottawa, ON, K1A 0R6, Canada
| | - Ian C Schoenhofen
- Human Health Therapeutics Portfolio, National Research Council Canada, Ottawa, ON, K1A 0R6, Canada.
| | - Christopher N Boddy
- Department of Chemistry and Biomolecular Sciences, Centre for Chemical and Synthetic Biology, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
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30
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Sanapala SR, Kulkarni SS. Expedient Route To Access Rare Deoxy Amino l-Sugar Building Blocks for the Assembly of Bacterial Glycoconjugates. J Am Chem Soc 2016; 138:4938-47. [DOI: 10.1021/jacs.6b01823] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Someswara Rao Sanapala
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Suvarn S. Kulkarni
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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31
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Williams JT, Corcilius L, Kiefel MJ, Payne RJ. Total Synthesis of Native 5,7-Diacetylpseudaminic Acid from N-Acetylneuraminic Acid. J Org Chem 2016; 81:2607-11. [PMID: 26907566 DOI: 10.1021/acs.joc.5b02754] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The pseudaminic acids are a family of 5,7-diamino-3,5,7,9-tetradeoxynonulosonic acids that are functional components of flagellin and pili proteins within clinically relevant Gram-negative bacteria. Herein, we describe the total synthesis of the most common pseudaminic acid, 5,7-diacetylpseudaminic acid, from N-acetylneuraminic acid. The divergent nature of the route reported here provides a robust and versatile means to access other members of the family, together with analogues, for probing the functional role of the pseudaminic acids and pseudaminic acid derived proteins in the future.
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Affiliation(s)
- James T Williams
- School of Chemistry, The University of Sydney , Sydney, NSW, 2006, Australia
| | - Leo Corcilius
- School of Chemistry, The University of Sydney , Sydney, NSW, 2006, Australia
| | - Milton J Kiefel
- Institute for Glycomics, Griffith University Gold Coast Campus , Southport, QLD, 4222, Australia
| | - Richard J Payne
- School of Chemistry, The University of Sydney , Sydney, NSW, 2006, Australia
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32
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Shashkov AS, Kenyon JJ, Senchenkova SN, Shneider MM, Popova AV, Arbatsky NP, Miroshnikov KA, Volozhantsev NV, Hall RM, Knirel YA. Acinetobacter baumanniiK27 and K44 capsular polysaccharides have the same K unit but different structures due to the presence of distinctwzygenes in otherwise closely related K gene clusters. Glycobiology 2015; 26:501-8. [DOI: 10.1093/glycob/cwv168] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 12/17/2015] [Indexed: 12/27/2022] Open
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33
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Kenyon JJ, Marzaioli AM, Hall RM, De Castro C. Structure of the K6 capsular polysaccharide from Acinetobacter baumannii isolate RBH4. Carbohydr Res 2015; 409:30-5. [DOI: 10.1016/j.carres.2015.03.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 03/23/2015] [Accepted: 03/27/2015] [Indexed: 01/23/2023]
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34
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Kenyon JJ, Marzaioli AM, Hall RM, De Castro C. Structure of the K12 capsule containing 5,7-di-N-acetylacinetaminic acid from Acinetobacter baumannii isolate D36. Glycobiology 2015; 25:881-7. [PMID: 25926563 PMCID: PMC4487303 DOI: 10.1093/glycob/cwv028] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2015] [Accepted: 04/24/2015] [Indexed: 12/23/2022] Open
Abstract
The repeat unit of the K12 capsular polysaccharide isolated from the Acinetobacter baumannii global clone 1 clinical isolate, D36, was elucidated by means of chemical and spectroscopical methods. The structure was shown to contain N-acetyl-D-galactosamine (D-GalpNAc), N-acetyl-D-fucosamine and N-acetyl-L-fucosamine linked together in the main chain, with the novel sugar, 5,7-diacetamido-3,5,7,9-tetradeoxy-L-glycero-L-altro-non-2-ulosonic acid (5,7-di-N-acetylacinetaminic acid or Aci5Ac7Ac), attached to D-GalpNAc as a side branch. This matched the sugar composition of the K12 capsule and the genetic content of the KL12 capsule gene cluster reported previously. D-FucpNAc was predicted to be the substrate for the initiating transferase, ItrB3, with the Wzy polymerase making a α-D-FucpNAc-(1 → 3)-D-GalpNAc linkage between the repeat units. The three glycosyltransferases encoded by KL12 are all retaining glycosyltransferases and were predicted to form specific linkages between the sugars in the K12 repeat unit.
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Affiliation(s)
- Johanna J Kenyon
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW 2006, Australia
| | - Alberto M Marzaioli
- Department of Chemical Sciences, Complesso Universitario Monte Sant'Angelo, Napoli, Italy
| | - Ruth M Hall
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW 2006, Australia
| | - Cristina De Castro
- Department of Chemical Sciences, Complesso Universitario Monte Sant'Angelo, Napoli, Italy
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35
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Zunk M, Williams J, Carter J, Kiefel MJ. A new approach towards the synthesis of pseudaminic acid analogues. Org Biomol Chem 2015; 12:2918-25. [PMID: 24687140 DOI: 10.1039/c3ob42491j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The pseudaminic acids are a family of 5,7-diamino-3,5,7,9-tetradeoxynonulosonic acids that are essential components of bacterial polysaccharides and glycoproteins. This paper describes our approach towards the synthesis of analogues of pseudaminic acid, and involves the efficient introduction of the requisite nitrogen functionalities from a readily available precursor.
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Affiliation(s)
- Matthew Zunk
- Institute for Glycomics, Griffith University Gold Coast Campus, Southport, Queensland 4222, Australia.
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Matthies S, Stallforth P, Seeberger PH. Total synthesis of legionaminic acid as basis for serological studies. J Am Chem Soc 2015; 137:2848-51. [PMID: 25668389 DOI: 10.1021/jacs.5b00455] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Legionaminic acid is a nine-carbon diamino monosaccharide that is found coating the surface of various bacterial human pathogens. Its unique structure makes it a valuable biological probe, but access via isolation is difficult and no practical synthesis has been reported. We describe a stereoselective synthesis that yields a legionaminic acid building block as well as linker-equipped conjugation-ready legionaminic acid starting from cheap d-threonine. To set the desired amino and hydroxyl group pattern of the target, we designed a concise sequence of stereoselective reactions. The key transformations rely on chelation-controlled organometallic additions and a Petasis multicomponent reaction. The legionaminic acid was synthesized in a form that enables attachment to surfaces. Glycan microarray containing legionaminic acid revealed that human antibodies bind the synthetic glycoside. The synthetic bacterial monosaccharide is a valuable probe to detect an immune response to bacterial pathogens such as Legionella pneumophila, the causative agent of Legionnaire's disease.
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Affiliation(s)
- Stefan Matthies
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces , Am Mühlenberg 1, 14476 Potsdam, Germany
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Kenyon JJ, Marzaioli AM, De Castro C, Hall RM. 5,7-di-N-acetyl-acinetaminic acid: A novel non-2-ulosonic acid found in the capsule of an Acinetobacter baumannii isolate. Glycobiology 2015; 25:644-54. [PMID: 25595948 DOI: 10.1093/glycob/cwv007] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 01/09/2015] [Indexed: 01/25/2023] Open
Abstract
An Acinetobacter baumannii global clone 1 (GC1) isolate was found to carry a novel capsule biosynthesis gene cluster, designated KL12. KL12 contains genes predicted to be involved in the synthesis of simple sugars, as well as ones for N-acetyl-L-fucosamine (L-FucpNAc) and N-acetyl-D-fucosamine (D-FucpNAc). It also contains a module of 10 genes, 6 of which are required for 5,7-di-N-acetyl-legionaminic acid synthesis. Analysis of the composition of the capsule revealed the presence of N-acetyl-D-galactosamine, L-FucpNAc and D-FucpNAc, confirming the role of fnlABC and fnr/gdr genes in the synthesis of L-FucpNAc and D-FucpNAc, respectively. A non-2-ulosonic acid, shown to be 5,7-diacetamido-3,5,7,9-tetradeoxy-L-glycero-L-altro-non-2-ulosonic acid, was also detected. This sugar has not previously been recovered from biological source, and was designated 5,7-di-N-acetyl-acinetaminic acid (Aci5Ac7Ac). Proteins encoded by novel genes, named aciABCD, were predicted to be involved in the conversion of 5,7-di-N-acetyl-legionaminic acid to Aci5Ac7Ac. A pathway for 5,7-di-N-acetyl-8-epilegionaminic acid biosynthesis was also proposed. In available A. baumannii genomes, genes for the synthesis of 5,7-di-N-acetyl-acinetaminic acid were only detected in two closely related capsule gene clusters, KL12 and KL13, which differ only in the wzy gene. KL12 and KL13 are carried by isolates belonging to clinically important clonal groups, GC1, GC2 and ST25. Genes for the synthesis of N-acyl derivatives of legionaminic acid were also found in 10 further A. baumannii capsule gene clusters, and three carried additional genes for production of 5,7-di-N-acetyl-8-epilegionaminic acid.
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Affiliation(s)
- Johanna J Kenyon
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW 2006, Australia
| | | | | | - Ruth M Hall
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW 2006, Australia
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Kenyon JJ, Marzaioli AM, Hall RM, De Castro C. Structure of the K2 capsule associated with the KL2 gene cluster of Acinetobacter baumannii. Glycobiology 2014; 24:554-63. [PMID: 24688093 DOI: 10.1093/glycob/cwu024] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The repeat unit structure of the K2 capsule from an extensively antibiotic-resistant Acinetobacter baumannii global clone 2 (GC2) strain was determined. The oligosaccharide contains three simple sugars, d-glucopyranose, d-galatopyranose and N-acetyl-d-galactosamine, and the complex sugar, 5,7-diacetamido-3,5,7,9-tetradeoxy-l-glycero-l-manno-non-2-ulosonic acid (Pse5Ac7Ac or pseudaminic acid), which has not previously been reported in any A. baumannii capsule. The strain was found to carry all the genes required for the synthesis of the sugars and construction of the K2 structure. The linkages catalyzed by the initiating transferase, three glycosyltransferases and the Wzy polymerase were also predicted. Examination of publicly available A. baumannii genome sequences revealed that the same gene cluster, KL2, often occurs in extensively antibiotic-resistant GC2 isolates and in further strain types. The gene module responsible for the synthesis of pseudaminic acid was also detected in four other K loci. A related module including genes for an acylated relative of pseudaminic acid was also found in two new KL types. A polymerase chain reaction scheme was developed to detect all modules containing genes for sugars based on pseudaminic acid and to specifically detect KL2.
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Affiliation(s)
- Johanna J Kenyon
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW 2006, Australia
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The structure of the polysaccharide isolated from Acinetobacter baumannii strain LAC-4. Carbohydr Res 2014; 390:42-5. [PMID: 24690675 DOI: 10.1016/j.carres.2014.03.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 02/28/2014] [Accepted: 03/03/2014] [Indexed: 11/22/2022]
Abstract
The structure of the surface polysaccharide from a hypervirulent for mice Acinetobacter baumannii strain LAC-4 was studied. The polysaccharide was built of trisaccharide repeating units containing α-l-fucosamine, α-d-glucosamine, and α-8-epi-legionaminic acid. The structure interpretation was based mostly on NMR data. Polysaccharide was obtained using a procedure of LPS O-chain preparation, although whether it is an LPS O-chain or capsular polysaccharide remained unclear.
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Mas Pons J, Dumont A, Sautejeau G, Fugier E, Baron A, Dukan S, Vauzeilles B. Identification of LivingLegionella pneumophilaUsing Species-Specific Metabolic Lipopolysaccharide Labeling. Angew Chem Int Ed Engl 2014; 53:1275-8. [DOI: 10.1002/anie.201309072] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Indexed: 11/08/2022]
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Mas Pons J, Dumont A, Sautejeau G, Fugier E, Baron A, Dukan S, Vauzeilles B. Identification of LivingLegionella pneumophilaUsing Species-Specific Metabolic Lipopolysaccharide Labeling. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309072] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Kancharla PK, Crich D. Influence of side chain conformation and configuration on glycosyl donor reactivity and selectivity as illustrated by sialic acid donors epimeric at the 7-position. J Am Chem Soc 2013; 135:18999-9007. [PMID: 24261615 PMCID: PMC3917720 DOI: 10.1021/ja410683y] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Two N-acetyl 4O,5N-oxazolidinone-protected sialyl thioglycosides epimeric at the 7-position have been synthesized and their reactivity and stereoselectivity in glycosylation reactions have been compared. It is demonstrated that the natural 7S-donor is both more reactive and more α-selective than the unnatural 7R-isomer. The difference in reactivity is attributed to the side chain conformation and specifically to the proximity of O7 to the anomeric center. In the natural 7S-isomer, O7 is closer to the anomeric center than in its unnatural 7R-epimer and, therefore, better able to support incipient positive charge at the locus of reaction. The difference in selectivity is also attributed to the side conformation, which in the unnatural 7R-series is placed perpendicularly above the α-face of the donor and so shields it to a greater extent than in the 7S-series. These observations are consistent with earlier conclusions on the influence of the side chain conformation on reactivity and selectivity derived from conformationally locked models in the glucose and galactose series and corroborate the suggestion that those effects are predominantly stereoelectronic rather than torsional. The possible relevance of side chain conformation as a factor in the influence of glycosylation stereoselectivity by remote protecting groups and as a control element in enzymic processes for glycosidic bond formation and hydrolysis are discussed. Methods for assignment of the anomeric configuration in the sialic acid glycosides are critically surveyed.
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Affiliation(s)
- Pavan K Kancharla
- Department of Chemistry, Wayne State University , 5101 Cass Avenue, Detroit, Michigan 48202, United States
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Vinogradov E, Frimmelova M, Toman R. Chemical structure of the carbohydrate backbone of the lipopolysaccharide from Piscirickettsia salmonis. Carbohydr Res 2013; 378:108-13. [PMID: 23673236 DOI: 10.1016/j.carres.2013.04.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 04/09/2013] [Accepted: 04/10/2013] [Indexed: 11/30/2022]
Abstract
Elucidation of the carbohydrate backbone structure of the lipopolysaccharide (LPS) from Piscirickettsia salmonis, the etiological agent of the salmonid rickettsial septicemia, is described. Structural information was established by a combination of monosaccharide and methylation analyses of LPS, and by NMR and mass spectrometries of oligosaccharides obtained through the use of various chemical degradations of the native polymer. The following structure of the backbone sugars was determined on the basis of the combined data from these experiments: [formula see text] The presence of two consecutive residues of diacetylated pseudaminic acid (Pse5,7Ac, 5,7-diacetamido-3,5,7,9-tetradeoxy-l-glycero-l-manno-non-2-ulosonic acid) in the LPS appears to be unique among polysaccharides containing this acidic sugar. Similarly, the presence of 4-aminoarabinose (Ara4N, 4-amino-4-deoxy-l-arabinopyranose) on O-4 of the α-GlcN1P of the lipid A moiety is a unique feature of this LPS.
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Gram scale de novo synthesis of 2,4-diacetamido-2,4,6-trideoxy-d-galactose. Carbohydr Res 2013; 367:1-4. [DOI: 10.1016/j.carres.2012.11.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 11/20/2012] [Accepted: 11/21/2012] [Indexed: 12/16/2022]
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Sun Y, Arbatsky NP, Wang M, Shashkov AS, Liu B, Wang L, Knirel YA. Structure and genetics of the O-antigen ofCronobacter turicensisG3882 from a new serotype,C. turicensisO2, and identification of a serotype-specific gene. ACTA ACUST UNITED AC 2012; 66:323-33. [DOI: 10.1111/j.1574-695x.2012.01013.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 06/06/2012] [Accepted: 07/23/2012] [Indexed: 01/09/2023]
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Kandiba L, Aitio O, Helin J, Guan Z, Permi P, Bamford DH, Eichler J, Roine E. Diversity in prokaryotic glycosylation: an archaeal-derived N-linked glycan contains legionaminic acid. Mol Microbiol 2012; 84:578-93. [PMID: 22435790 DOI: 10.1111/j.1365-2958.2012.08045.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
VP4, the major structural protein of the haloarchaeal pleomorphic virus, HRPV-1, is glycosylated. To define the glycan structure attached to this protein, oligosaccharides released by β-elimination were analysed by mass spectrometry and nuclear magnetic resonance spectroscopy. Such analyses showed that the major VP4-derived glycan is a pentasaccharide comprising glucose, glucuronic acid, mannose, sulphated glucuronic acid and a terminal 5-N-formyl-legionaminic acid residue. This is the first observation of legionaminic acid, a sialic acid-like sugar, in an archaeal-derived glycan structure. The importance of this residue for viral infection was demonstrated upon incubation with N-acetylneuraminic acid, a similar monosaccharide. Such treatment reduced progeny virus production by half 4 h post infection. LC-ESI/MS analysis confirmed the presence of pentasaccharide precursors on two different VP4-derived peptides bearing the N-glycosylation signal, NTT. The same sites modified by the native host, Halorubrum sp. strain PV6, were also recognized by the Haloferax volcanii N-glycosylation apparatus, as determined by LC-ESI/MS of heterologously expressed VP4. Here, however, the N-linked pentasaccharide was the same as shown to decorate the S-layer glycoprotein in this species. Hence, N-glycosylation of the haloarchaeal viral protein, VP4, is host-specific. These results thus present additional examples of archaeal N-glycosylation diversity and show the ability of Archaea to modify heterologously expressed proteins.
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Affiliation(s)
- Lina Kandiba
- Department of Life Sciences, Ben Gurion University of the Negev, Beersheva 84105, Israel
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Post DMB, Yu L, Krasity BC, Choudhury B, Mandel MJ, Brennan CA, Ruby EG, McFall-Ngai MJ, Gibson BW, Apicella MA. O-antigen and core carbohydrate of Vibrio fischeri lipopolysaccharide: composition and analysis of their role in Euprymna scolopes light organ colonization. J Biol Chem 2012; 287:8515-30. [PMID: 22247546 DOI: 10.1074/jbc.m111.324012] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Vibrio fischeri exists in a symbiotic relationship with the Hawaiian bobtail squid, Euprymna scolopes, where the squid provides a home for the bacteria, and the bacteria in turn provide camouflage that helps protect the squid from night-time predators. Like other gram-negative organisms, V. fischeri expresses lipopolysaccharide (LPS) on its cell surface. The structure of the O-antigen and the core components of the LPS and their possible role in colonization of the squid have not previously been determined. In these studies, an O-antigen ligase mutant, waaL, was utilized to determine the structures of these LPS components and their roles in colonization of the squid. WaaL ligates the O-antigen to the core of the LPS; thus, LPS from waaL mutants lacks O-antigen. Our results show that the V. fischeri waaL mutant has a motility defect, is significantly delayed in colonization, and is unable to compete with the wild-type strain in co-colonization assays. Comparative analyses of the LPS from the wild-type and waaL strains showed that the V. fischeri LPS has a single O-antigen repeat composed of yersiniose, 8-epi-legionaminic acid, and N-acetylfucosamine. In addition, the LPS from the waaL strain showed that the core structure consists of L-glycero-D-manno-heptose, D-glycero-D-manno-heptose, glucose, 3-deoxy-D-manno-octulosonic acid, N-acetylgalactosamine, 8-epi-legionaminic acid, phosphate, and phosphoethanolamine. These studies indicate that the unusual V. fischeri O-antigen sugars play a role in the early phases of bacterial colonization of the squid.
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Affiliation(s)
- Deborah M B Post
- Buck Institute for Research on Aging, Novato, California 94945, USA
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Hanashima S. Recent Strategies for Stereoselective Sialylation and Their Application to the Synthesis of Oligosialosides. TRENDS GLYCOSCI GLYC 2011. [DOI: 10.4052/tigg.23.111] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Lee YJ, Kubota A, Ishiwata A, Ito Y. Synthesis of pseudaminic acid, a unique nonulopyranoside derived from pathogenic bacteria through 6-deoxy-AltdiNAc. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2010.11.078] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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