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Gurung PB, Shine G, Zhu J. Synthesis of Salmonella enteritidis Antigenic Tetrasaccharide Repeating Unit by Employing Cationic Gold(I)-Catalyzed Glycosylation Involving Glycosyl N-1,1-Dimethylpropargyl Carbamate Donors. J Org Chem 2024. [PMID: 39137335 DOI: 10.1021/acs.joc.4c01484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
Synthesis of an antigenic tetrasaccharide repeating unit of the O-polysaccharide of Salmonella enteritidis lipopolysaccharide has been accomplished. Those four monosaccharides were assembled stereoselectively by employing our recently developed cationic gold(I)-catalyzed glycosylation methodology involving various glycosyl N-1,1-dimethylpropargyl carbamate donors. The newly formed α-anomeric stereochemical configuration was controlled by the axial C2-OBz of the glycosyl donors via anchimeric assistance.
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Affiliation(s)
- Prem Bahadur Gurung
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio 43606, United States
| | - Gavin Shine
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio 43606, United States
| | - Jianglong Zhu
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio 43606, United States
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Abstract
We report the de novo asymmetric synthesis of the 3,6-dideoxy sugars abequose, paratose, and tyvelose from 2-acetylfuran. Conversion of this readily available ketone to a pyranone derivative was followed by transformation to either an α- or β-glycoside via diasteroselective acylation. Michael addition at C2 controlled primarily by the C1 configuration in the glycoside produced 3,6-dideoxy-4-keto sugars, which could be reduced and converted to either fully deprotected monosaccharides or to immediate precursors of glycosyl donors.
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Affiliation(s)
- Sheng Yang
- Institute of Biological Chemistry, Academia Sinica, Nangang, Taipei 11529, Taiwan.,Department of Chemistry, National Tsing Hua University, Hsinchu 300044, Taiwan.,Chemical Biology and Molecular Biophysics, Taiwan International Graduate Program, Academia Sinica, Nangang, Taipei 11529, Taiwan
| | - Chun-Jui Chu
- Department of Chemistry, The University of Alberta, Edmonton, Alberta, Canada T6G 2G2.,Institute of Biological Chemistry, Academia Sinica, Nangang, Taipei 11529, Taiwan
| | - Todd L Lowary
- Department of Chemistry, The University of Alberta, Edmonton, Alberta, Canada T6G 2G2.,Institute of Biological Chemistry, Academia Sinica, Nangang, Taipei 11529, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei 106 Taiwan.,Chemical Biology and Molecular Biophysics, Taiwan International Graduate Program, Academia Sinica, Nangang, Taipei 11529, Taiwan
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Olsson JDM, Landström J, Rönnols J, Oscarson S, Widmalm G. Synthesis of and molecular dynamics simulations on a tetrasaccharide corresponding to the repeating unit of the capsular polysaccharide from Salmonella enteritidis. Org Biomol Chem 2009; 7:1612-8. [PMID: 19343247 DOI: 10.1039/b823428k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Syntheses of two oligosaccharides as methyl glycosides related to the repeating unit of S. enteritidis capsular polysaccharide (CPS) are presented. The trisaccharide corresponds to the backbone of the CPS whereas the tetrasaccharide is a model for the repeating unit which has a branched structure. Molecular dynamics simulations investigating their flexibility and dynamics revealed that the oligosaccharides populate several conformational states and indicate that conformational averaging should be used in describing the accessible conformational space.
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Affiliation(s)
- Johan D M Olsson
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91, Stockholm, Sweden
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Grant CF, Kanda V, Yu H, Bundle DR, McDermott MT. Optimization of immobilized bacterial disaccharides for surface plasmon resonance imaging measurements of antibody binding. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:14125-32. [PMID: 19360960 DOI: 10.1021/la8026489] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The interactions between proteins and immobilized carbohydrates are crucial to biological events such as cell signaling and immune response. The modification of surfaces with carbohydrates to create sensing platforms provides a pathway to study these interactions in a laboratory setting. In this work, a family of structurally related Salmonella disaccharide epitopes is immobilized on thin gold films in an array format to probe antibody binding with surface plasmon resonance (SPR) imaging. The disaccharides are modified with an alkyl thiol linker for facile immobilization to gold. Small differences in the stereochemistry of the immobilized, modified disaccharides are shown to greatly influence the binding of a monoclonal antibody. Specifically, binding is only observed to an immobilized abequose dideoxyhexose relative to a tyvelose or a paratose analogue. However, both the amount and relative strength of bound antibody depends on the distribution of disaccharide moieties in a mixed monolayer of the epitope and a nonbinding diluent molecule. We thoroughly characterize the mixed monolayers with a variety of techniques to understand the optimal density and distribution of the disaccharide for antibody capture. This work reinforces the importance of controlling the density of ligands at the interface for optimized surface based bioassays.
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Affiliation(s)
- Chris F Grant
- Department of Chemistry and National Institute for Nanotechnology, University of Alberta, Edmonton, AB, Canada
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Abstract
A highly efficient one-pot methodology is described for the synthesis of heparin and heparan sulfate oligosaccharides utilizing thioglycosides with well-defined reactivity as building blocks. L-Idopyranosyl and D-glucopyranosyl thioglycosides 5 and 10 were used as donors due to low reactivity of uronic acids as the glycosyl donors in the one-pot synthesis. The formation of uronic acids by a selective oxidation at C-6 was performed after assembly of the oligosaccharides. The efficiency of this programmable strategy with the flexibility for sulfate incorporation was demonstrated in the representative synthesis of disaccharides 17, 18, tetrasaccharide 23, and pentasaccharide 26.
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Affiliation(s)
- Tülay Polat
- Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, E-mail:
| | - Chi-Huey Wong
- Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, E-mail:
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