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Cattin M, Bruxelle JF, Ng K, Blaukopf M, Pantophlet R, Kosma P. Synthetic neoglycoconjugates of hepta- and nonamannoside ligands for eliciting oligomannose-specific HIV-1-neutralizing antibodies. Chembiochem 2022; 23:e202200061. [PMID: 35104013 PMCID: PMC9108342 DOI: 10.1002/cbic.202200061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 02/01/2022] [Indexed: 11/08/2022]
Abstract
Oligomannose-type glycans on the spike protein of HIV-1 constitute relevant epitopes to elicit broadly neutralizing antibodies (bnAbs). Herein we describe an improved synthesis of α- and β-linked hepta- and nonamannosyl ligands that, subsequently, were converted into BSA and CRM 197 neoglycoconjugates. We assembled the ligands from anomeric 3-azidopropyl spacer glycosides from select 3-O-protected thiocresyl mannoside donors. Chain extensions were achieved using 4+3 or 4+5 block synthesis of thiocresyl and trichloroacetimidate glycosyl donors. Subsequent global deprotection generated the 3-aminopropyl oligosaccharide ligands. ELISA binding data obtained with the β-anomeric hepta- and nonamannosyl conjugates with a selection of HIV-1 bnAbs showed comparable binding of both mannosyl ligands by Fab fragments yet lesser binding of the nonasaccharide conjugate by the corresponding IgG antibodies. These results support previous observations that a complete Man 9 structure might not be the preferred antigenic binding motif for some oligomannose-specific antibodies and have implications for glycoside designs to elicit oligomannose-targeted HIV-1-neutralizing antibodies.
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Affiliation(s)
- Matteo Cattin
- University of Natural Resources and Life Sciences: Universitat fur Bodenkultur Wien, Chemistry, Muthgasse 18, A 1190, Vienna, AUSTRIA
| | - Jean-François Bruxelle
- Simon Fraser University Faculty of Health Sciences, Molecular Biology and Biochemistry, Burnaby, CANADA
| | - Kurtis Ng
- Simon Fraser University Faculty of Health Sciences, Molecular Biology and Biochemistry, CANADA
| | - Markus Blaukopf
- University of Natural Resources and Life Sciences Vienna: Universitat fur Bodenkultur Wien, Chemistry, AUSTRIA
| | - Ralph Pantophlet
- Simon Fraser University Faculty of Health Sciences, Molecular Biology and Biochemistry, V5A 1S6, Burnaby, CANADA
| | - Paul Kosma
- University of Natural Resources and Life Sciences, Chemistry, Muthgasse 18, A 1190, Vienna, AUSTRIA
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2
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Nguyen H, Zhu D, Li X, Zhu J. Stereoselective Construction of β‐Mannopyranosides by Anomeric
O
‐Alkylation: Synthesis of the Trisaccharide Core of
N
‐linked Glycans. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600488] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Hai Nguyen
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering The University of Toledo Toledo OH 43606 USA
| | - Danyang Zhu
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering The University of Toledo Toledo OH 43606 USA
| | - Xiaohua Li
- Department of Natural Sciences University of Michigan-Dearborn Dearborn MI 48128 USA
| | - Jianglong Zhu
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering The University of Toledo Toledo OH 43606 USA
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3
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Nguyen H, Zhu D, Li X, Zhu J. Stereoselective Construction of β-Mannopyranosides by Anomeric O-Alkylation: Synthesis of the Trisaccharide Core of N-linked Glycans. Angew Chem Int Ed Engl 2016; 55:4767-71. [PMID: 26948686 DOI: 10.1002/anie.201600488] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Indexed: 01/07/2023]
Abstract
A new and efficient approach for direct and stereoselective synthesis of β-mannopyranosides by anomeric O-alkylation has been developed. This anomeric O-alkylation of mannopyranose-derived lactols is proposed to occur under synergistic control of a kinetic anomeric effect and metal chelation. The presence of a conformationally flexible C6 oxygen atom in the sugar-derived lactol donors is required for this anomeric O-alkylation to be efficient, probably because of its chelation with cesium ion. In contrast, the presence of a C2 oxygen atom plays a minor role. This glycosylation method has been successfully utilized for the synthesis of the trisaccharide core of complex N-linked glycans.
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Affiliation(s)
- Hai Nguyen
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, Toledo, OH, 43606, USA
| | - Danyang Zhu
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, Toledo, OH, 43606, USA
| | - Xiaohua Li
- Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, MI, 48128, USA.
| | - Jianglong Zhu
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, Toledo, OH, 43606, USA.
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4
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Zhu Y, Yu B. Highly Stereoselective β-Mannopyranosylation via the 1-α-Glycosyloxy-isochromenylium-4-gold(I) Intermediates. Chemistry 2015; 21:8771-80. [DOI: 10.1002/chem.201500648] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Indexed: 01/02/2023]
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5
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Ott D, Seifert J, Prahl I, Niemietz M, Hoffman J, Guder J, Mönnich M, Unverzagt C. Modular Synthesis of Core Fucosylated N-Glycans. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200468] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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6
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Kalmár L, Ágoston K, Szurmai Z, Döncző B, Kerékgyártó J. Synthesis of FullyO-BenzylatedN-Linked Core Pentasaccharide Glycosyl Azide. J Carbohydr Chem 2012. [DOI: 10.1080/07328303.2011.642433] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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7
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8
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Unverzagt C, Eller S, Mezzato S, Schuberth R. A Double Regio- and Stereoselective Glycosylation Strategy for the Synthesis of N-Glycans. Chemistry 2008; 14:1304-11. [DOI: 10.1002/chem.200701251] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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9
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Rearrangements in the Course of Nucleophilic Substitution Reactions. Top Curr Chem (Cham) 2001. [DOI: 10.1007/3-540-44422-x_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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10
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Abstract
Despite the omnipresence of protein glycosylation in nature, little is known about how the attachment of carbohydrates affects peptide and protein activity. One reason is the lack of a straightforward method to access biologically relevant glycopeptides and glycoproteins. The isolation of homogeneous glycopeptides from natural sources is complicated by the heterogeneity of naturally occuring glycoproteins. It is chemical and chemoenzymatic synthesis that is meeting the challenge to solve this availability problem, thus playing a key role for the advancement of glycobiology. The current art of glycopeptide synthesis, albeit far from being routine, has reached a level of maturity that allows for the access to homogeneous and pure material for biological and medicinal research. Even the ambitious goal of the total synthesis of an entire glycoprotein is within reach. It is demonstrated that with the help of synthetic glycopeptides the effects of glycosylation on protein structure and function can be studied in molecular detail. For example, in immunology, synthetic (tumour-specific) glycopeptides can be used as immunogens to elicit a tumour-cell-specific immune response. Again, synthetic glycopeptides are an invaluable tool to determine the fine specificity of the immune response that can be mediated by both carbohydrate-specific B and T cells. Furthermore, selected examples for the use of synthetic glycopeptides as ligands of carbohydrate-binding proteins and as enzyme substrates or inhibitors are presented.
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Affiliation(s)
- O Seitz
- Department of Chemical Biology Max-Planck-Institut für molekulare Physiologie Otto-Hahn-Strasse 11, 44227 Dortmund, Germany.
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11
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12
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Weiler S, Schmidt RR. A versatile strategy for the synthesis of complex type N-Glycans: Synthesis of diantennary and bisected diantennary oligosaccharides. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)00246-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Abstract
A partial structure of many glycoproteins, a glycosylated asparagine carrying a complex type undecasaccharide N-glycan (Neu5Ac(alpha 2-6)Gal(beta 1-4)GlcNAc(beta 1-2)Man alpha 1-3) [Neu5Ac(alpha 2-6)Gal(beta 1-4)GlcNAc(beta 1-2)Man(alpha 1-6)]Man(beta 1-4) GlcNAc(beta 1-4)GlcNAc-Asn) was obtained by total synthesis. As a starting material served a chemically synthesized diantennary heptasaccharide azide which was deprotected in a three-step sequence in high yield. The reduction of the anomeric azide was accomplished with propanedithiol in methanol-ethyldiisopropylamine. Coupling of the glycosyl amine to an activated aspartic acid gave the benzyl protected asparagine conjugate. After removal of the six benzyl functions the resulting free heptasaccharide asparagine was elongated enzymatically in the oligosaccharide part. The use of beta-1,4-galactosyltransferase and alpha-2,6-sialytransferase in the presence of alkaline phosphatase allowed the efficient transfer of four sugar units to the acceptor resulting in a full length N-glycan, a sialyated diantennary undecasaccharide-asparagine of the complex type.
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Affiliation(s)
- C Unverzagt
- Institut für Organische Chemie und Biochemie, TU München, Garching, Germany
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14
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Watt GM, Revers L, Webberley MC, Wilson IBH, Flitsch SL. Eine effiziente enzymatische Synthese des Core-Trisaccharids von N-Glycanen mit einer rekombinanten β-Mannosyltransferase. Angew Chem Int Ed Engl 1997. [DOI: 10.1002/ange.19971092120] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Synthesis of 2-hydroxy-6-{[(16R)-β-δ-mannopyransyloxy]heptadecyl}benzoic acid, a fungal metabolite with GABAA ion channel receptor inhibiting properties. Tetrahedron 1996. [DOI: 10.1016/s0040-4020(96)00950-7] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Unverzagt C. Chemoenzymatische Synthese eines sialylierten Undecasaccharid-Asparagins. Angew Chem Int Ed Engl 1996. [DOI: 10.1002/ange.19961082012] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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17
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Unverzagt C. Synthesis of a Biantennary Heptasaccharide by Regioselective Glycosylations. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/anie.199411021] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Unverzagt C. Synthese eines verzweigten Heptasaccharids durch regioselektive Glycosylierungen. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941061024] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Kerékgyártó J, van der Ven JG, Kamerling JP, Lipták A, Vliegenthart JF. Synthesis of a selectively protected trisaccharide building block that is part of xylose-containing carbohydrate chains from N-glycoproteins. Carbohydr Res 1993; 238:135-45. [PMID: 8431931 DOI: 10.1016/0008-6215(93)87009-h] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The synthesis is reported of ethyl 4-O-[3-O-allyl-4,6-O-isopropylidene-2-O-(2,3,4-tri-O-acetyl-beta-D- xylopyranosyl)-beta-D-mannopyranosyl]-3,6-di-O-benzyl-2-deoxy-2-phthalim ido-1 - thio-beta-D-glucopyranoside (16), a key intermediate in the synthesis of xylose-containing carbohydrate chains from N-glycoproteins. Condensation of ethyl 3,6-di-O-benzyl-2-deoxy-2-phthalimido-1-thio-beta-D- glucopyranoside (5) with 2,4,6-tri-O-acetyl-3-O-allyl-alpha-D-glucopyranosyl bromide, using silver triflate as a promoter, gave the beta-linked disaccharide derivative 8 (84%). O-Deacetylation of 8 and then isopropylidenation afforded 10, which was converted via oxidation-reduction into ethyl 4-O-(3-O-allyl-4,6-O-isopropylidene-beta-D-mannopyranosyl)-3,6-di-O-benz yl-2- deoxy-2-phthalimido-1-thio-beta-D-glucopyranoside (12). Silver triflate-promoted condensation of 12 with 2,3,4-tri-O-acetyl-alpha-D-xylopyranosyl bromide gave 16 (71%). The Xylp unit in 16 and in de-isopropylidenated 16 (17) existed in the 1C4(D) conformation, but that in O-deacetylated 17 (18) existed in the 4C1(D) conformation.
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Affiliation(s)
- J Kerékgyártó
- Institute of Biochemistry, L. Kossuth University, Debrecen, Hungary
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20
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Günther W, Kunz H. Synthese eines β-Mannosyl-Chitobiosyl-Asparagin-Konjugates—eines zentralen Elements der Core-Region vonN-Glycoproteinen. Angew Chem Int Ed Engl 1990. [DOI: 10.1002/ange.19901020915] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Paulsen H. Synthesen, Konformationen und Röntgenstrukturanalysen von Saccharidketten der Core-Regionen von Glycoproteinen. Angew Chem Int Ed Engl 1990. [DOI: 10.1002/ange.19901020804] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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