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Gauthier C, Chassagne P, Theillet FX, Guerreiro C, Thouron F, Nato F, Delepierre M, Sansonetti PJ, Phalipon A, Mulard LA. Non-stoichiometric O-acetylation of Shigella flexneri 2a O-specific polysaccharide: synthesis and antigenicity. Org Biomol Chem 2016; 12:4218-32. [PMID: 24836582 DOI: 10.1039/c3ob42586j] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthetic functional mimics of the O-antigen from Shigella flexneri 2a are seen as promising vaccine components against endemic shigellosis. Herein, the influence of the polysaccharide non-stoichiometric di-O-acetylation on antigenicity is addressed for the first time. Three decasaccharides, representing relevant internal mono- and di-O-acetylation profiles of the O-antigen, were synthesized from a pivotal protected decasaccharide designed to tailor late stage site-selective O-acetylation. The latter was obtained via a convergent route involving the imidate glycosylation chemistry. Binding studies to five protective mIgGs showed that none of the acetates adds significantly to broad antibody recognition. Yet, one of the five antibodies had a unique pattern of binding. With IC50 in the micromolar to submicromolar range mIgG F22-4 exemplifies a remarkable tight binding antibody against diversely O-acetylated and non-O-acetylated fragments of a neutral polysaccharide of medical importance.
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Affiliation(s)
- Charles Gauthier
- Institut Pasteur, Chimie des Biomolécules, Dépt de Biologie Structurale et Chimie, 28 rue du Dr Roux, 75724 Paris Cedex 15, France.
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Laroussarie A, Barycza B, Andriamboavonjy H, Tamigney Kenfack M, Blériot Y, Gauthier C. Synthesis of the Tetrasaccharide Repeating Unit of the β-Kdo-Containing Exopolysaccharide from Burkholderia pseudomallei and B. cepacia Complex. J Org Chem 2015; 80:10386-96. [DOI: 10.1021/acs.joc.5b01823] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Anaïs Laroussarie
- Université de Poitiers, Institut de Chimie IC2MP, CNRS-UMR
7285, Équipe Synthèse Organique, 4 rue Michel Brunet, 86073 Poitiers Cedex 9, France
| | - Barbara Barycza
- Université de Poitiers, Institut de Chimie IC2MP, CNRS-UMR
7285, Équipe Synthèse Organique, 4 rue Michel Brunet, 86073 Poitiers Cedex 9, France
- Department
of Chemistry, Wroclaw University of Environmental and Life Sciences, Norwida
25, 50-375 Wroclaw, Poland
| | - Hanitra Andriamboavonjy
- Université de Poitiers, Institut de Chimie IC2MP, CNRS-UMR
7285, Équipe Synthèse Organique, 4 rue Michel Brunet, 86073 Poitiers Cedex 9, France
| | - Marielle Tamigney Kenfack
- Université de Poitiers, Institut de Chimie IC2MP, CNRS-UMR
7285, Équipe Synthèse Organique, 4 rue Michel Brunet, 86073 Poitiers Cedex 9, France
| | - Yves Blériot
- Université de Poitiers, Institut de Chimie IC2MP, CNRS-UMR
7285, Équipe Synthèse Organique, 4 rue Michel Brunet, 86073 Poitiers Cedex 9, France
| | - Charles Gauthier
- Université de Poitiers, Institut de Chimie IC2MP, CNRS-UMR
7285, Équipe Synthèse Organique, 4 rue Michel Brunet, 86073 Poitiers Cedex 9, France
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Seth PP, Jazayeri A, Yu J, Allerson CR, Bhat B, Swayze EE. Structure Activity Relationships of α-L-LNA Modified Phosphorothioate Gapmer Antisense Oligonucleotides in Animals. MOLECULAR THERAPY. NUCLEIC ACIDS 2012; 1:e47. [PMID: 23344239 PMCID: PMC3499693 DOI: 10.1038/mtna.2012.34] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We report the structure activity relationships of short 14-mer phosphorothioate gapmer antisense oligonucleotides (ASOs) modified with α-L-locked nucleic acid (LNA) and related modifications targeting phosphatase and tensin homologue (PTEN) messenger RNA in mice. α-L-LNA represents the α-anomer of enantio-LNA and modified oligonucleotides show LNA like binding affinity for complementary RNA. In contrast to sequence matched LNA gapmer ASOs which showed elevations in plasma alanine aminotransferase (ALT) levels indicative of hepatotoxicity, gapmer ASOs modified with α-L-LNA and related analogs in the flanks showed potent downregulation of PTEN messenger RNA in liver tissue without producing elevations in plasma ALT levels. However, the α-L-LNA ASO showed a moderate dose-dependent increase in liver and spleen weights suggesting a higher propensity for immune stimulation. Interestingly, replacing α-L-LNA nucleotides in the 3′- and 5′-flanks with R-5′-Me-α-L-LNA but not R-6′-Me- or 3′-Me-α-L-LNA nucleotides, reversed the drug induced increase in organ weights. Examination of structural models of dinucleotide units suggested that the 5′-Me group increases steric bulk in close proximity to the phosphorothioate backbone or produces subtle changes in the backbone conformation which could interfere with recognition of the ASO by putative immune receptors. Our data suggests that introducing steric bulk at the 5′-position of the sugar-phosphate backbone could be a general strategy to mitigate the immunostimulatory profile of oligonucleotide drugs. In a clinical setting, proinflammatory effects manifest themselves as injection site reactions and flu-like symptoms. Thus, a mitigation of these effects could increase patient comfort and compliance when treated with ASOs.
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Zhou C, Chattopadhyaya J. Intramolecular free-radical cyclization reactions on pentose sugars for the synthesis of carba-LNA and carba-ENA and the application of their modified oligonucleotides as potential RNA targeted therapeutics. Chem Rev 2012; 112:3808-32. [PMID: 22530946 DOI: 10.1021/cr100306q] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Chuanzheng Zhou
- Chemical Biology Program, Department of Cell and Molecular Biology, Biomedical Center, Uppsala University, Sweden
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Seth PP, Allerson CA, Østergaard ME, Swayze EE. Synthesis and biophysical evaluation of 3'-Me-α-L-LNA - Substitution in the minor groove of α-L-LNA duplexes. Bioorg Med Chem Lett 2011; 21:4690-4. [PMID: 21778053 DOI: 10.1016/j.bmcl.2011.06.104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Revised: 06/22/2011] [Accepted: 06/24/2011] [Indexed: 10/18/2022]
Abstract
The synthesis and biophysical evaluation of 3'-Me-α-L-LNA is reported. The synthesis of the nucleoside building block phosphoramidite was accomplished starting from diacetone glucose. The 3'-Me group was introduced in the desired configuration by hydride mediated opening of an exocyclic epoxide. Inversion of the 2'-hydroxyl group was achieved by means of an oxidation/reduction sequence followed by cyclization onto a 5'-leaving group to assemble the [2.2.1] ring system. Biophysical evaluation of 3'-Me-α-L-LNA modified oligonucleotides showed good duplex thermal stabilizing properties which were similar to α-L-LNA. Mismatch discrimination experiments revealed that 3'-Me-α-L-LNA possess slightly enhanced discrimination properties for the GU wobble base-pair as compared to related nucleic acid analogs.
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Affiliation(s)
- Punit P Seth
- Department of Medicinal Chemistry, Isis Pharmaceuticals, 1891 Rutherford Road, Carlsbad, CA 92008, United States.
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Gupta P, Dharuman S, Vankar YD. (3S,4R,5R)-3-(2-Hydroxyethyl)piperidine-3,4,5-triol as an isofagomine analogue: synthesis and glycosidase inhibition study. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.11.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Kumar S, Sharma PK, Stein PC, Nielsen P. Synthesis of the 3′-C-Hydroxymethyl-Branched Locked Nucleic Acid Thymidine Monomer. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Boutet J, Mulard LA. Synthesis of Two Tetra- and Four Pentasaccharide Fragments ofShigella flexneriSerotypes 3a and X O-Antigens from a Common Tetrasaccharide Intermediate. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800693] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Enderlin G, Nielsen P. Synthesis of 6'-branched locked nucleic acid by a radical TEMPO-scavanged stereoselective mercury cyclization. J Org Chem 2008; 73:6891-4. [PMID: 18672932 DOI: 10.1021/jo801081t] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A 6'(R)-hydroxymethyl derivative of the locked nucleic acid (LNA)-thymidine monomer has been synthesized by a stereoselective mercury cyclization and subsequent use of TEMPO as a radical scavenger. This compound was converted to an azide derivative, which in a Huisgen-type [3 + 2] cycloaddition afforded a double-headed nucleoside with a triazole linking an additional thymine to the 6'-position of the LNA-nucleoside monomer.
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Affiliation(s)
- Gerald Enderlin
- Nucleic Acid Center, Department of Physics and Chemistry, University of Southern Denmark, 5230 Odense M, Denmark
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Sharma PK, Kumar S, Nielsen P. Synthesis of a branched locked nucleic acid (LNA) analogue. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2008; 26:1505-8. [PMID: 18066815 DOI: 10.1080/15257770701542975] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A 3'-C-branched LNA-type bicyclic nucleoside, containing a furanose ring locked in an N-type conformation, was synthesized from a known 3-C-vinyl allofuranose derivative using a strategy relying on the condensation with the nucleobase after the introduction of the branching hydroxymethyl chain by our recently developed RuO4 based protocol. This branched LNA nucleoside has a potential as a monomer for the functionalization of LNA.
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Affiliation(s)
- Pawan K Sharma
- Department of Chemistry, Kurukshetra University, Kurukshetra, India
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Peterson MA, Ke P, Shi H, Jones C, McDougall BR, Robinson WE. Design, synthesis, and antiviral evaluation of some 3'-carboxymethyl-3'-deoxyadenosine derivatives. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2007; 26:499-519. [PMID: 17578746 DOI: 10.1080/15257770701426278] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
3'-Carboxymethyl-3'-deoxyadenosine derivatives were prepared from 2'-O-TBDMS-3'-[(ethoxycarbonyl)methyl]-3'-deoxyadenosine (1) via simple and efficient procedures. Conversion of 1 to its 5'-azido-5'-deoxy derivative 5 was accomplished via a novel one-pot method employing 5'-activation (TosCl) followed by efficient nucleophilic displacement with tetramethylguanidinium azide. Compound 5 was converted to 5'-[(N-methylcarbamoyl)amino] derivative 8 via one-pot reduction/acylation employing H(2)/Pd-C followed by treatment with p-nitrophenyl N-methylcarbamate. N(6)-phenylcarbamoyl groups were introduced by treatment with phenylisocyanate, and an efficient new method for lactonization of 2'-O-TBDMS-3'-[(ethoxycarbonyl)methyl]-3'-deoxyadenosines to give corresponding 2',3'-lactones was also developed. Target compounds were evaluated for anti-HIV and anti-HIV integrase activities, but were not active at the concentrations tested.
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Affiliation(s)
- Matt A Peterson
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA.
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Kumar TS, Madsen AS, Wengel J, Hrdlicka PJ. Synthesis and hybridization studies of 2'-amino-alpha-L-LNA and tetracyclic "locked LNA". J Org Chem 2007; 71:4188-201. [PMID: 16709060 DOI: 10.1021/jo060331f] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A convergent route to a new class of locked nucleic acids, i.e., 2'-amino-alpha-L-LNA, has been developed. The optimized synthetic route to the corresponding phosphoramidite building block of thymine proceeds in 4% overall yield over 15 steps from the starting diol. Crucial synthetic steps include (a) introduction of a C2-azido group prior to nucleobase coupling, (b) Vorbrüggen glycosylation primarily affording the desired alpha-anomer, (c) separation of alpha-L-ribo- and beta-L-ribo-configured bicyclic nucleosides, and (d) selection of a suitable protecting group to avoid intramolecular Michael addition of the C2'-amino group onto the C6-position. Incorporation of a 2'-amino-alpha-L-LNA monomer into oligodeoxyribonucleotides results in modest changes in thermal stability with complementary DNA, whereas significant increases in thermal stability are observed with RNA complements along with excellent Watson-Crick discrimination. These results, along with the flexibility of the synthetic strategy allowing chemoselective N2'-functionalization at a late stage, render 2'-amino-alpha-L-LNA a promising building block for nucleic acid based nanobiotechnology and therapeutics. A slight modification in strategy facilitated the synthesis of the corresponding phosphoramidite building blocks of Michael adducts, which due to their tetracyclic skeletons exhibit a conformationally restricted furanose ring and glycosidic torsion angle (anti-range). Incorporation of such a "locked LNA" monomer into oligodeoxyribonucleotides results in large decreases in thermal affinity toward DNA/RNA complements.
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Affiliation(s)
- T Santhosh Kumar
- Nucleic Acid Center, Department of Chemistry, University of Southern Denmark, DK-5230 Odense M, Denmark
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Yu CS, Wang RT, Chiang LW, Lee MH. Synthesis of 4′,4′-C-diaminomethyl nucleoside derivative as a building block for constructing libraries via amide bond formation. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.03.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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