1
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Sun A, Li Z, Wang Y, Meng S, Zhang X, Meng X, Li S, Li Z, Li Z. Stereocontrolled Synthesis of α-3-Deoxy-d-manno-oct-2-ulosonic Acid (α-Kdo) Glycosides Using C3-p-Tolylthio-Substituted Kdo Donors: Access to Highly Branched Kdo Oligosaccharides. Angew Chem Int Ed Engl 2024; 63:e202313985. [PMID: 38014418 DOI: 10.1002/anie.202313985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 11/05/2023] [Accepted: 11/27/2023] [Indexed: 11/29/2023]
Abstract
3-Deoxy-d-manno-oct-2-ulosonic acid (Kdo) is an eight-carbon monosaccharide found widely in bacterial lipopolysaccharides (LPSs) and capsule polysaccharides (CPSs). We developed an indirect method for the stereoselective synthesis of α-Kdo glycosides with a C3-p-tolylthio-substituted Kdo phosphite donor. The presence of the p-tolylthio group enhanced the reactivity, suppressed the formation of elimination by-products (2,3-enes), and provided complete α-stereocontrol. A variety of Kdo α-glycosides were synthesized by our method in excellent yields (up to 98 %). After glycosylation, the p-tolylthio group can be efficiently removed by free-radical reduction. Subsequently, the orthogonality of the phosphite donor and thioglycoside donor was demonstrated by the one-pot synthesis of a trisaccharide in Helicobacter pylori and Neisseria meningitidis LPS. Moreover, an efficient total synthesis route to the challenging 4,5-branched Kdo trisaccharide in LPSs from several A. baumannii strains was highlighted. To demonstrate the high reactivity of our approach further, the highly crowded 4,5,7,8-branched Kdo pentasaccharide was synthesized as a model molecule for the first time. Additionally, the reaction mechanism was investigated by DFT calculations.
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Affiliation(s)
- Ao Sun
- State Key Laboratory of Natural and Biomimetic Drugs, Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, China
| | - Zipeng Li
- State Key Laboratory of Natural and Biomimetic Drugs, Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, China
| | - Yuchao Wang
- State Key Laboratory of Natural and Biomimetic Drugs, Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, China
| | - Shuai Meng
- Key Laboratory of Tropical Biological Resources of Ministry of Education, School of Pharmaceutical Sciences, College of Marine Science, Hainan University, Haikou, 570228, China
| | - Xiao Zhang
- State Key Laboratory of Natural and Biomimetic Drugs, Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, China
| | - Xiangbao Meng
- State Key Laboratory of Natural and Biomimetic Drugs, Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, China
| | - Shuchun Li
- State Key Laboratory of Natural and Biomimetic Drugs, Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, China
| | - Zhongtang Li
- State Key Laboratory of Natural and Biomimetic Drugs, Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, China
| | - Zhongjun Li
- State Key Laboratory of Natural and Biomimetic Drugs, Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, China
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2
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Zhou XY, Li LX, Zhang Z, Duan SC, Huang YW, Luo YY, Mu XD, Chen ZW, Qin Y, Hu J, Yin J, Yang JS. Chemical Synthesis and Antigenic Evaluation of Inner Core Oligosaccharides from Acinetobacter baumannii Lipopolysaccharide. Angew Chem Int Ed Engl 2022; 61:e202204420. [PMID: 35543248 DOI: 10.1002/anie.202204420] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Indexed: 02/05/2023]
Abstract
Acinetobacter baumannii is currently posing a serious threat to global health. Lipopolysaccharide (LPS) is a potent virulence factor of pathogenic Gram-negative bacteria. To explore the antigenic properties of A. baumannii LPS, four Kdo-containing inner core glycans from A. baumannii strain ATCC 17904 were synthesized. A flexible and divergent method based on the use of the orthogonally substituted α-Kdo-(2→5)-Kdo disaccharides was developed. Selective removal of different protecting groups in these key precursors and elongation of sugar chain via α-stereocontrolled coupling with 5,7-O-di-tert-butylsilylene or 5-O-benzoyl protected Kdo thioglycosides and 2-azido-2-deoxyglucosyl thioglycoside allowed efficient assembly of the target molecules. Glycan microarray analysis of sera from infected patients revealed that the 4,5-branched Kdo trimer was a potential antigenic epitope, which is attractive for further immunological research to develop carbohydrate vaccines against A. baumannii.
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Affiliation(s)
- Xian-Yang Zhou
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Ling-Xin Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Wuxi School of Medicine, Jiangnan University, Wuxi, 214122, China
| | - Zhen Zhang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Shi-Chao Duan
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Ying-Wen Huang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yi-Yang Luo
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Xiao-Dong Mu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Zhi-Wei Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yong Qin
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Jing Hu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Wuxi School of Medicine, Jiangnan University, Wuxi, 214122, China
| | - Jian Yin
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Wuxi School of Medicine, Jiangnan University, Wuxi, 214122, China
| | - Jin-Song Yang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
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3
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Zhou X, Li L, Zhang Z, Duan S, Huang Y, Luo Y, Mu X, Chen Z, Qin Y, Hu J, Yin J, Yang J. Chemical Synthesis and Antigenic Evaluation of Inner Core Oligosaccharides from
Acinetobacter baumannii
Lipopolysaccharide. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Xian‐Yang Zhou
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China
| | - Ling‐Xin Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of Education School of Biotechnology Wuxi School of Medicine Jiangnan University Wuxi 214122 China
| | - Zhen Zhang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China
| | - Shi‐Chao Duan
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China
| | - Ying‐Wen Huang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China
| | - Yi‐Yang Luo
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China
| | - Xiao‐Dong Mu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China
| | - Zhi‐Wei Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China
| | - Yong Qin
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China
| | - Jing Hu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of Education School of Biotechnology Wuxi School of Medicine Jiangnan University Wuxi 214122 China
| | - Jian Yin
- Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of Education School of Biotechnology Wuxi School of Medicine Jiangnan University Wuxi 214122 China
| | - Jin‐Song Yang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China
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4
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Furevi A, Ruda A, Angles d’Ortoli T, Mobarak H, Ståhle J, Hamark C, Fontana C, Engström O, Apostolica P, Widmalm G. Complete 1H and 13C NMR chemical shift assignments of mono-to tetrasaccharides as basis for NMR chemical shift predictions of oligo- and polysaccharides using the computer program CASPER. Carbohydr Res 2022; 513:108528. [DOI: 10.1016/j.carres.2022.108528] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/21/2022] [Accepted: 02/22/2022] [Indexed: 02/02/2023]
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6
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Trattnig N, Blaukopf M, Bruxelle JF, Pantophlet R, Kosma P. Synthesis of an Undecasaccharide Featuring an Oligomannosidic Heptasaccharide and a Bacterial Kdo-lipid A Backbone for Eliciting Neutralizing Antibodies to Mammalian Oligomannose on the HIV-1 Envelope Spike. J Am Chem Soc 2019; 141:7946-7954. [PMID: 31010286 PMCID: PMC6524000 DOI: 10.1021/jacs.9b02872] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
![]()
Lipooligosaccharides (LOS) from the
bacterium Rhizobium
radiobacter Rv3 are structurally related to antigenic mammalian
oligomannoses on the HIV-1 envelope glycoprotein spike that are targets
for broadly neutralizing antibodies. Here, we prepared a hybrid structure
of viral and bacterial epitopes as part of a vaccine design strategy
to elicit oligomannose-specific HIV-neutralizing antibodies using
glycoconjugates based on the Rv3 LOS structure. Starting from a Kdo2GlcNAc2 tetrasaccharide precursor, a central orthogonally
protected mannose trichloroacetimidate donor was coupled to OH-5 of
the innermost Kdo residue. To assemble larger glycans, the N-acetylamino groups of the glucosamine units were converted
to imides to prevent formation of unwanted imidate byproducts. Blockwise
coupling of the pentasaccharide acceptor with an α-(1→2)-linked
mannotriosyl trichloroacetimidate donor introduced the D1-arm fragment.
Glycosylation of O-6 of the central branching mannose
with an α-(1→2)-α-(1→6)-linked mannotriosyl
trichloroacetimidate donor unit then furnished the undecasaccharide
harboring a D3-arm extension. Global deprotection yielded the 3-aminopropyl
ligand, which was activated as an isothiocyanate or adipic acid succinimidoyl
ester and conjugated to CRM197. However, representative
oligomannose-specific HIV-neutralizing antibodies bound the undecasaccharide
conjugates poorly. Possible reasons for this outcome are discussed
herein along with paths for improvement.
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Affiliation(s)
- Nino Trattnig
- Department of Chemistry , University of Natural Resources and Life Sciences , A-1190 Vienna , Austria
| | - Markus Blaukopf
- Department of Chemistry , University of Natural Resources and Life Sciences , A-1190 Vienna , Austria
| | | | | | - Paul Kosma
- Department of Chemistry , University of Natural Resources and Life Sciences , A-1190 Vienna , Austria
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7
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Harvey DJ. Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: An update for 2013-2014. MASS SPECTROMETRY REVIEWS 2018; 37:353-491. [PMID: 29687922 DOI: 10.1002/mas.21530] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 11/29/2016] [Indexed: 06/08/2023]
Abstract
This review is the eighth update of the original article published in 1999 on the application of Matrix-assisted laser desorption/ionization mass spectrometry (MALDI) mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2014. Topics covered in the first part of the review include general aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, fragmentation, and arrays. The second part of the review is devoted to applications to various structural types such as oligo- and poly- saccharides, glycoproteins, glycolipids, glycosides, and biopharmaceuticals. Much of this material is presented in tabular form. The third part of the review covers medical and industrial applications of the technique, studies of enzyme reactions, and applications to chemical synthesis. © 2018 Wiley Periodicals, Inc. Mass Spec Rev 37:353-491, 2018.
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Affiliation(s)
- David J Harvey
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford, OX3 7FZ, United Kingdom
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8
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Ichiyanagi T. Recent Synthetic Approaches to Inner-core Oligosaccharides of Lipopolysaccharides and Lipooligosaccharides. TRENDS GLYCOSCI GLYC 2018. [DOI: 10.4052/tigg.1709.1e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Ichiyanagi T. Recent Synthetic Approaches to Inner-core Oligosaccharides of Lipopolysaccharides and Lipooligosaccharides. TRENDS GLYCOSCI GLYC 2018. [DOI: 10.4052/tigg.1709.1j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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10
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Trattnig N, Farcet JB, Gritsch P, Christler A, Pantophlet R, Kosma P. Synthesis of a Pentasaccharide Fragment Related to the Inner Core Region of Rhizobial and Agrobacterial Lipopolysaccharides. J Org Chem 2017; 82:12346-12358. [PMID: 29028168 PMCID: PMC5715290 DOI: 10.1021/acs.joc.7b02172] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
![]()
The
pentasaccharide fragment α-d-Man-(1 →
5)-[α-d-Kdo-(2 → 4)-]α-d-Kdo-(2
→ 6)-β-d-GlcNAc-(1 → 6)-α-d-GlcNAc equipped with a 3-aminopropyl spacer moiety was prepared
by a sequential assembly of monosaccharide building blocks. The glucosamine
disaccharide—as a backbone surrogate of the bacterial lipid
A region—was synthesized using an 1,3-oxazoline donor, which
was followed by coupling with an isopropylidene-protected Kdo-fluoride
donor to afford a protected tetrasaccharide intermediate. Eventually,
an orthogonally protected manno-configured trichloroacetimidate
donor was used to achieve the sterically demanding glycosylation of
the 5-OH group of Kdo in good yield. The resulting pentasaccharide
is suitably protected for further chain elongation at positions 3,
4, and 6 of the terminal mannose. Global deprotection afforded the
target pentasaccharide to be used for the conversion into neoglycoconjugates
and “clickable” ligands.
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Affiliation(s)
- Nino Trattnig
- Department of Chemistry, University of Natural Resources and Life Sciences , A-1190 Vienna, Austria
| | - Jean-Baptiste Farcet
- Department of Chemistry, University of Natural Resources and Life Sciences , A-1190 Vienna, Austria
| | - Philipp Gritsch
- Department of Chemistry, University of Natural Resources and Life Sciences , A-1190 Vienna, Austria
| | - Anna Christler
- Department of Chemistry, University of Natural Resources and Life Sciences , A-1190 Vienna, Austria
| | - Ralph Pantophlet
- Faculty of Health Sciences and Department of Molecular Biology and Biochemistry, Simon Fraser University , Burnaby, British Columbia V5A1S6, Canada
| | - Paul Kosma
- Department of Chemistry, University of Natural Resources and Life Sciences , A-1190 Vienna, Austria
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11
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Abstract
Glycosylation chemistry of 3-deoxy-D-manno-oct-2-ulosonic acid units has been considerably developed within the last decade. This review covers major achievements with respect to improved yields and anomeric selectivity as well as suppression of the elimination side reaction via selection of dedicated protecting groups and appropriate activation of the anomeric center.
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Affiliation(s)
- Paul Kosma
- University of Natural Resources and Life Sciences-Vienna, Department of Chemistry, Muthgasse 18, A-1190 Vienna, Austria
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12
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Pokorny B, Kosma P. Synthesis of 5-O-oligoglucosyl extended α-(2→4)-Kdo disaccharides corresponding to inner core fragments of Moraxellaceae lipopolysaccharides. Carbohydr Res 2016; 422:5-12. [PMID: 26795079 DOI: 10.1016/j.carres.2015.12.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 12/10/2015] [Accepted: 12/24/2015] [Indexed: 12/16/2022]
Abstract
The heptose-deficient inner core of the lipopolysaccharide of several pathogenic strains of the Moraxellaceae family (Moraxella, Acinetobacter) and of Bartonella henselae, respectively, comprises an α-D-glucopyranose attached to position 5 of Kdo. In continuation of the synthesis of fragments of Acinetobacter haemolyticus LPS, the branched α-Glcp-(1 → 5)[α-Kdo-(2 → 4)]-α-Kdo trisaccharide motif was elaborated. The glycosylation of a suitably protected, α-(2 → 4)-interlinked Kdo-disaccharide was achieved in high yield and fair anomeric selectivity using a 4,6-O-benzylidene N-phenyltrifluoroacetimidate glucosyl donor. Subsequent regioselective reductive benzylidene opening afforded a trisaccharide acceptor, which was extended with β-D-glucopyranosyl and isomaltosyl residues. Global deprotection provided tri- to pentasaccharide structures corresponding to the inner core region of A. haemolyticus lipopolysaccharide.
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Affiliation(s)
- Barbara Pokorny
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Paul Kosma
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria.
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13
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Giguère D. Surface polysaccharides from Acinetobacter baumannii : Structures and syntheses. Carbohydr Res 2015; 418:29-43. [DOI: 10.1016/j.carres.2015.10.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 09/30/2015] [Accepted: 10/03/2015] [Indexed: 12/31/2022]
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14
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Pokorny B, Kosma P. Scope and Limitations of 3-Iodo-Kdo Fluoride-Based Glycosylation Chemistry using N-Acetyl Glucosamine Acceptors. ChemistryOpen 2015; 4:722-8. [PMID: 27308198 PMCID: PMC4906502 DOI: 10.1002/open.201500126] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Indexed: 12/11/2022] Open
Abstract
The ketosidic linkage of 3-deoxy-d-manno-octulosonic acid (Kdo) to lipid A constitutes a general structural feature of the bacterial lipopolysaccharide core. Glycosylation reactions of Kdo donors, however, are challenging due to the absence of a directing group at C-3 and elimination reactions resulting in low yields and anomeric selectivities of the glycosides. While 3-iodo-Kdo fluoride donors showed excellent glycosyl donor properties for the assembly of Kdo oligomers, glycosylation of N-acetyl-glucosamine derivatives was not straightforward. Specifically, oxazoline formation of a β-anomeric methyl glycoside, as well as iodonium ion transfer to an allylic aglycon was found. In addition, dehalogenation of the directing group by hydrogen atom transfer proved to be incompatible with free hydroxyl groups next to benzyl groups. In contrast, glycosylation of a suitably protected methyl 2-acetamido-2-deoxy-α-d-glucopyranoside derivative and subsequent deiodination proceeded in excellent yields and α-specificity, and allowed for subsequent 4-O-phosphorylation. This way, the disaccharides α-Kdo-(2→6)-α-GlcNAcOMe and α-Kdo-(2→6)-α-GlcNAcOMe-4-phosphate were obtained in good overall yields.
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Affiliation(s)
- Barbara Pokorny
- Department of ChemistryUniversity of Natural Resources and Life Sciences-ViennaMuthgasse 181190ViennaAustria
| | - Paul Kosma
- Department of ChemistryUniversity of Natural Resources and Life Sciences-ViennaMuthgasse 181190ViennaAustria
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15
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Yi R, Narimoto H, Nozoe M, Ichiyanagi T. Convergent synthesis of 4,5-branched inner-core oligosaccharides of lipopoly- and lipooligosaccharides. Biosci Biotechnol Biochem 2015; 79:1931-45. [PMID: 26235297 DOI: 10.1080/09168451.2015.1069698] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The convergent synthesis of branched inner-core oligosaccharides of lipopoly- and lipooligosaccharide with a 3-deoxy-d-manno-oct-2-ulosonic acid (Kdo) disaccharide acceptor was achieved. The l-glycero-d-manno-heptopyranose (Hep) units for the branched core oligosaccharide Galβ(1-4)Glcβ(1-4)Hep and Hepα(1-3)Hep were prepared from the corresponding Hep building blocks. To obtain 4,5-branched core oligosaccharide structures, the common acceptor Kdoα(2-4)Kdo was glycosylated with the Hep units.
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Affiliation(s)
- Ruiqin Yi
- a The United Graduate School of Agricultural Sciences , Tottori University , Tottori , Japan
| | - Hirofumi Narimoto
- b Faculty of Agriculture, Department of Life and Food Sciences , Tottori University , Tottori , Japan
| | - Miku Nozoe
- b Faculty of Agriculture, Department of Life and Food Sciences , Tottori University , Tottori , Japan
| | - Tsuyoshi Ichiyanagi
- b Faculty of Agriculture, Department of Life and Food Sciences , Tottori University , Tottori , Japan
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16
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Feng Y, Dong J, Xu F, Liu A, Wang L, Zhang Q, Chai Y. Efficient Large Scale Syntheses of 3-Deoxy-d-manno-2-octulosonic acid (Kdo) and Its Derivatives. Org Lett 2015; 17:2388-91. [DOI: 10.1021/acs.orglett.5b00901] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yingle Feng
- School of Chemistry and Chemical
Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710119, P. R. China
| | - Jie Dong
- School of Chemistry and Chemical
Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710119, P. R. China
| | - Fangyuan Xu
- School of Chemistry and Chemical
Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710119, P. R. China
| | - Aiyun Liu
- School of Chemistry and Chemical
Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710119, P. R. China
| | - Li Wang
- School of Chemistry and Chemical
Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710119, P. R. China
| | - Qi Zhang
- School of Chemistry and Chemical
Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710119, P. R. China
| | - Yonghai Chai
- School of Chemistry and Chemical
Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710119, P. R. China
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17
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Pokorny B, Kosma P. Synthesis of chlamydia lipopolysaccharide haptens through the use of α-specific 3-iodo-Kdo fluoride glycosyl donors. Chemistry 2015; 21:305-13. [PMID: 25354167 PMCID: PMC4768360 DOI: 10.1002/chem.201405424] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Indexed: 12/20/2022]
Abstract
A scalable approach towards high-yielding and (stereo)selective glycosyl donors of the 2-ulosonic acid Kdo (3-deoxy-D-manno-oct-2-ulosonic acid) is a fundamental requirement for the development of vaccines against Gram-negative bacteria. Herein, we disclose a short synthetic route to 3-iodo Kdo fluoride donors from Kdo glycal esters that enable efficient α-specific glycosylations and significantly suppress the elimination side reaction. The potency of these donors is demonstrated in a straightforward, six-step synthesis of a branched Chlamydia-related Kdo-trisaccharide ligand without the need for protecting groups at the Kdo glycosyl acceptor. The approach was further extended to include sequential iteration of the basic concept to produce the linear Chlamydia-specific α-Kdo-(2→8)-α-Kdo-(2→4)-α-Kdo trisaccharide in a good overall yield.
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Affiliation(s)
- Barbara Pokorny
- Department of Chemistry, University of Natural Resources and Life Sciences-Vienna, Muthgasse 18, A-1190 Vienna, Austria
| | - Paul Kosma
- Department of Chemistry, University of Natural Resources and Life Sciences-Vienna, Muthgasse 18, A-1190 Vienna, Austria
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18
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Pokorny B, Kosma P. First and stereoselective synthesis of an α-(2→5)-linked disaccharide of 3-deoxy-D-manno-oct-2-ulosonic acid (Kdo). Org Lett 2015; 17:110-3. [PMID: 25496419 PMCID: PMC4284650 DOI: 10.1021/ol5033128] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Indexed: 12/02/2022]
Abstract
Resistance of bacterial pathogens toward antibiotics has revived interest in lipopolysaccharide (LPS) motifs as potential therapeutic targets. The LPS of several pathogenic Acinetobacter strains comprises a 4,5-branched Kdo trisaccharide containing an uncommon (2→5)-linkage. In this contribution the first stereoselective glycosylation method for obtaining an α-Kdo-(2→5)-α-Kdo disaccharide in good yield is highlighted. The synthetic approach used for accessing this linkage type will allow for future studies of the immunoreactivity associated with this unique bacterial Kdo inner core structure.
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Affiliation(s)
- Barbara Pokorny
- Department
of Chemistry, University of Natural Resources
and Life Sciences-Vienna, Muthgasse 18, A-1190 Vienna, Austria
| | - Paul Kosma
- Department
of Chemistry, University of Natural Resources
and Life Sciences-Vienna, Muthgasse 18, A-1190 Vienna, Austria
| |
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