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Marchesi A, Parmeggiani F, Louçano J, Mattey AP, Huang K, Gupta T, Salwiczek M, Flitsch SL. Enzymatic Building-Block Synthesis for Solid-Phase Automated Glycan Assembly. Angew Chem Int Ed Engl 2020; 59:22456-22459. [PMID: 32857448 PMCID: PMC7756758 DOI: 10.1002/anie.202008067] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Indexed: 12/19/2022]
Abstract
Automated chemical oligosaccharide synthesis is an attractive concept that has been successfully applied to a large number of target structures, but requires excess quantities of suitably protected and activated building blocks. Herein we demonstrate the use of biocatalysis to supply such reagents for automated synthesis. By using the promiscuous NmLgtB-B β1-4 galactosyltransferase from Neisseria meningitidis we demonstrate fast and robust access to the LacNAc motif, common to many cell-surface glycans, starting from either lactose or sucrose as glycosyl donors. The enzymatic product was shown to be successfully incorporated as a complete unit into a tetrasaccharide target by automated assembly.
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Affiliation(s)
- Andrea Marchesi
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterUK
| | - Fabio Parmeggiani
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterUK
- Department of Chemistry, Materials and Chemical Engineering, “G. Natta”Politecnico di MilanoVia Mancinelli 720131MilanoItaly
| | - João Louçano
- GlycoUniverse GmbH & Co KGaAAm Muehlenberg 1114476PotsdamGermany
| | - Ashley P. Mattey
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterUK
| | - Kun Huang
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterUK
| | - Tanistha Gupta
- GlycoUniverse GmbH & Co KGaAAm Muehlenberg 1114476PotsdamGermany
| | - Mario Salwiczek
- GlycoUniverse GmbH & Co KGaAAm Muehlenberg 1114476PotsdamGermany
| | - Sabine L. Flitsch
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterUK
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2
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Marchesi A, Parmeggiani F, Louçano J, Mattey AP, Huang K, Gupta T, Salwiczek M, Flitsch SL. Enzymatic Building‐Block Synthesis for Solid‐Phase Automated Glycan Assembly. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Andrea Marchesi
- Manchester Institute of Biotechnology University of Manchester 131 Princess Street Manchester UK
| | - Fabio Parmeggiani
- Manchester Institute of Biotechnology University of Manchester 131 Princess Street Manchester UK
- Department of Chemistry, Materials and Chemical Engineering, “G. Natta” Politecnico di Milano Via Mancinelli 7 20131 Milano Italy
| | - João Louçano
- GlycoUniverse GmbH & Co KGaA Am Muehlenberg 11 14476 Potsdam Germany
| | - Ashley P. Mattey
- Manchester Institute of Biotechnology University of Manchester 131 Princess Street Manchester UK
| | - Kun Huang
- Manchester Institute of Biotechnology University of Manchester 131 Princess Street Manchester UK
| | - Tanistha Gupta
- GlycoUniverse GmbH & Co KGaA Am Muehlenberg 11 14476 Potsdam Germany
| | - Mario Salwiczek
- GlycoUniverse GmbH & Co KGaA Am Muehlenberg 11 14476 Potsdam Germany
| | - Sabine L. Flitsch
- Manchester Institute of Biotechnology University of Manchester 131 Princess Street Manchester UK
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3
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Andersen MCF, Kračun SK, Rydahl MG, Willats WGT, Clausen MH. Synthesis of β-1,4-Linked Galactan Side-Chains of Rhamnogalacturonan I. Chemistry 2016; 22:11543-8. [PMID: 27305141 DOI: 10.1002/chem.201602197] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Indexed: 11/05/2022]
Abstract
The synthesis of linear- and (1→6)-branched β-(1→4)-d-galactans, side-chains of the pectic polysaccharide rhamnogalacturonan I is described. The strategy relies on iterative couplings of n-pentenyl disaccharides followed by a late stage glycosylation of a common hexasaccharide core. Reaction with a covalent linker and immobilization on N-hydroxysuccinimide (NHS)-modified glass surfaces allows the generation of carbohydrate microarrays. The glycan arrays enable the study of protein-carbohydrate interactions in a high-throughput fashion, demonstrated herein with binding studies of mAbs and a CBM.
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Affiliation(s)
- Mathias C F Andersen
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800 Kgs., Lyngby, Denmark
| | - Stjepan K Kračun
- Department of Plant and Environmental Sciences, Thorvaldsensvej 40, Frederiksberg C, 1871, Denmark
| | - Maja G Rydahl
- Department of Plant and Environmental Sciences, Thorvaldsensvej 40, Frederiksberg C, 1871, Denmark
| | - William G T Willats
- Department of Plant and Environmental Sciences, Thorvaldsensvej 40, Frederiksberg C, 1871, Denmark.,School of Agriculture, Food and Rural Development, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Mads H Clausen
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800 Kgs., Lyngby, Denmark.
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4
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Matwiejuk M, Thiem J. New Method for Regioselective Glycosylation Employing Saccharide Oxyanions. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100861] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Nokami T, Nozaki Y, Saigusa Y, Shibuya A, Manabe S, Ito Y, Yoshida JI. Glycosyl Sulfonium Ions as Storable Intermediates for Glycosylations. Org Lett 2011; 13:1544-7. [DOI: 10.1021/ol200242u] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Toshiki Nokami
- Department of Synthetic Chemistry, Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan, and ERATO JST, Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yuki Nozaki
- Department of Synthetic Chemistry, Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan, and ERATO JST, Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yoshihiro Saigusa
- Department of Synthetic Chemistry, Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan, and ERATO JST, Hirosawa, Wako, Saitama 351-0198, Japan
| | - Akito Shibuya
- Department of Synthetic Chemistry, Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan, and ERATO JST, Hirosawa, Wako, Saitama 351-0198, Japan
| | - Shino Manabe
- Department of Synthetic Chemistry, Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan, and ERATO JST, Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yukishige Ito
- Department of Synthetic Chemistry, Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan, and ERATO JST, Hirosawa, Wako, Saitama 351-0198, Japan
| | - Jun-ichi Yoshida
- Department of Synthetic Chemistry, Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan, and ERATO JST, Hirosawa, Wako, Saitama 351-0198, Japan
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6
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Sundgren A, Lahmann M, Oscarson S. Synthesis of 6-PEtN-α-D-GalpNAc-(1->6)-β-D-Galp-(1->4)-β-D-GlcpNAc-(1->3)-β-D-Galp-(1->4)-β-D-Glcp, a Haemophilus influenzae lipopolysacharide structure, and biotin and protein conjugates thereof. Beilstein J Org Chem 2010; 6:704-8. [PMID: 20978608 PMCID: PMC2956385 DOI: 10.3762/bjoc.6.80] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Accepted: 07/07/2010] [Indexed: 12/02/2022] Open
Abstract
Background: In bacteria with truncated lipopolysaccharide structures, i.e., lacking the O-antigen polysaccharide part, core structures are exposed to the immune system upon infection and thus their use as carbohydrate surface antigens in glycoconjugate vaccines can be considered and investigated. One such suggested structure from Haemophilus influenzae LPS is the phosphorylated pentasaccharide 6-PEtN-α-D-GalpNAc-(1→6)-β-D-Galp-(1→4)-β-D-GlcpNAc-(1→3)-β-D-Galp-(1→4)-β-D-Glcp. Results: Starting from a spacer-containing lactose derivative a suitably protected lacto-N-neotetraose tetrasaccharide structure was constructed through subsequential couplings with two thioglycoside donors, a glucosamine residue followed by a galactose derivative, using NIS/AgOTf as promoter. Removal of a silyl protecting group at the primary position of the non-reducing end residue afforded an acceptor to which the terminal α-galactosamine moiety was introduced using a 2-azido bromo sugar and halide assisted coupling conditions. Global deprotection afforded the non-phosphorylated target pentasaccharide, whereas removal of a silyl group from the primary position of the non-reducing end residue produced a free hydroxy group which was phosphorylated using H-phosphonate chemistry to yield the phosphoethanolamine-containing protected pentasaccharide. Partial deprotection afforded the phosphorylated target pentasaccharide with a free spacer amino group but with a protected phosphoethanolamino group. Conjugation of the spacer amino group to biotin or dimethyl squarate followed by deprotection of the phosphoethanolamino group and, in the case of the squarate derivative, further reaction with a protein then afforded the title conjugates. Conclusion: An effective synthesis of a biologically interesting pentasaccharide structure has been accomplished. The target pentasaccharide, an α-GalNAc substituted lacto-N-neotetraose structure, comprises a phosphoethanolamine motif and a spacer aglycon. Through the spacer, biotin and protein conjugates of the title compound have been constructed to allow further use in biological experiments.
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Affiliation(s)
- Andreas Sundgren
- Department of Chemistry, Göteborg University, S-412 96 Gothenburg, Sweden.
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7
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Matsuoka K, Kaneko R, Koyama T, Ma X, Esumi Y, Nakamura T, Hatano K, Terunuma D. Synthesis of sialyllactosamine clusters using carbosilane as core scaffolds by means of chemical and enzymatic approaches. Bioorg Med Chem Lett 2010; 20:4906-10. [PMID: 20620057 DOI: 10.1016/j.bmcl.2010.06.066] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Revised: 06/09/2010] [Accepted: 06/11/2010] [Indexed: 10/19/2022]
Abstract
An efficient synthesis of sialyllactosamine (SiaLacNAc) clusters using carbosilanes as core scaffolds has been accomplished by means of chemical and enzymatic approaches. N-Acetyl-D-glucosamine (GlcNAc) clusters having O-glycosidic linkage or S-glycosidic linkage were chemically synthesized from known intermediates in high yields. The GlcNAc clusters were first used as substrates for beta1,4 galactosyl transferase using UDP-galactose (UDP-Gal) as a sugar source to provide corresponding N-acetyllactosamine clusters. Further sugar elongation of the LacNAc clusters was demonstrated using alpha2,3 sialyl transferase and CMP-neuraminic acid (CMP-NANA) to yield the corresponding SiaLacNAc clusters.
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Affiliation(s)
- Koji Matsuoka
- Area for Molecular Function, Division of Material Science, Graduate School of Science and Engineering, Saitama University, Sakura, Saitama 338-8570, Japan.
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8
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Belén Cid M, Alfonso F, Alonso I, Martín-Lomas M. On the origin of the regioselectivity in glycosylation reactions of 1,2-diols. Org Biomol Chem 2009; 7:1471-81. [DOI: 10.1039/b819452a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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9
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Yamada A, Hatano K, Koyama T, Matsuoka K, Esumi Y, Terunuma D. Syntheses of a series of lacto-N-neotetraose clusters using a carbosilane dendrimer scaffold. Carbohydr Res 2006; 341:467-73. [PMID: 16386236 DOI: 10.1016/j.carres.2005.11.037] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2005] [Accepted: 11/10/2005] [Indexed: 11/29/2022]
Abstract
4-Pentenyl (2,3,4,6-tetra-O-acetyl-beta-d-galactopyranosyl)-(1-->4)-(3,6-di-O-acetyl-2-deoxy-2-phthalimido-beta-d-glucopyranosyl)-(1-->3)-(2,6-di-O-benzoyl-beta-d-galactopyranosyl)-(1-->4)-2,3,6-tri-O-benzoyl-beta-d-glucopyranoside (4) was synthesized by regioselective glycosylation of 4-pentenyl (2,6,-di-O-benzoyl-beta-d-galactopyranosyl)-(1-->4)-2,3,6-tri-O-benzoyl-beta-d-glucopyranoside and (2,3,4,6-tetra-O-acetyl-beta-d-galactopyranosyl)-(1-->4)-3,6-di-O-acetyl-2-deoxy-2-phthalimido-beta-d-glucopyranosyl chloride. By conversion of the protecting groups followed by thioacetylation, 4 was transformed into the corresponding lacto-N-neotetraose derivative, 5-(acetylthio)pentenyl (2,3,4,6-tetra-O-acetyl-beta-d-galactopyranosyl)-(1-->4)-O-(3,6-di-O-acetyl-2-acetamido-2-deoxy-beta-d-glucopyranosyl)-(1-->3)-(2,4,6-di-O-acetyl-beta-d-galactopyranosyl)-(1-->4)-2,3,6-tri-O-acetyl-beta-d-glucopyranoside (6). The lacto-N-neotetraose derivative 6 was introduced into carbosilane dendrimer cores of three shapes, and three kinds of new carbosilane dendrimers peripherally functionalized by lacto-N-neotetraose were obtained.
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Affiliation(s)
- Akihiro Yamada
- Department of Functional Materials Science, Faculty of Engineering, Saitama University, 255 Shimo-ohkubo, Sakura-ku, Saitama 338-8570, Japan
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10
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Sundgren A, Lahmann M, Oscarson S. Block Synthesis of Streptococcus pneumoniae Type 14 Capsular Polysaccharide Structures*. J Carbohydr Chem 2005. [DOI: 10.1081/car-200066935] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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11
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Matsuoka K, Onaga T, Mori T, Sakamoto JI, Koyama T, Sakairi N, Hatano K, Terunuma D. Synthesis of a useful lauryl thioglycoside of sialic acid and its application. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.10.105] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Sherman AA, Yudina ON, Mironov YV, Sukhova EV, Shashkov AS, Menshov VM, Nifantiev NE. Study of glycosylation with N-trichloroacetyl-D-glucosamine derivatives in the syntheses of the spacer-armed pentasaccharides sialyl lacto-N-neotetraose and sialyl lacto-N-tetraose, their fragments, and analogues. Carbohydr Res 2001; 336:13-46. [PMID: 11675024 DOI: 10.1016/s0008-6215(01)00213-0] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The syntheses of 2-aminoethyl glycosides of the pentasaccharides Neu5Ac-alpha(2-->3)-Gal-beta(1-->4)-GlcNAc-beta(1-->3)-Gal-beta(1-->4)-Glc and Neu5Ac-alpha(2-->3)-Gal-beta(1-->3)-GlcNAc-beta(1-->3)-Gal-beta(1-->4)-Glc, their asialo di-, tri-, and tetrasaccharide fragments, and analogues included a systematic study of glycosylation with variously protected mono- and disaccharide donors derived from N-trichloroacetyl-D-glucosamine of galactose, lactose, and lactosamine glycosyl acceptors bearing benzoyl protection around the OH group to be glycosylated. Despite the low reactivity of these acceptors, stereospecificity and good to excellent yields were obtained with NIS-TfOH-activated thioglycoside donors of such type, or with AgOTf-activated glycosyl bromides, while other promotors, as well as a trichloroacetimidate donor, were less effective, and a beta-acetate donor was inactive. In NIS-TfOH-promoted glycosylation with the thioglycosides, the use of TfOH in catalytic amount led to rapid formation of the corresponding oxazoline, but the quantity of TfOH necessary for further efficient coupling with an acceptor depended on the reactivity of the donor, varying from 0.07 equiv for a 3,6-di-O-benzylated monosaccharide derivative to 2.1 equiv for a peracetylated disaccharide one. In the glycosylation products, the N-trichloroacetyl group was easily converted into N-acetyl by alkaline hydrolysis followed by N-acetylation.
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Affiliation(s)
- A A Sherman
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospect 47, B-334 119991, Moscow, Russia
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13
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Abstract
Five disaccharides related in structure to the glycans of vertebrate mucins have been chemically synthesized using orthogonal blocking, coupling and deblocking techniques. These include 2-naphthylmethyl 3,4,6-tetra-O-acetyl-beta-D-galactopyranosyl-( 1 --> 4)-2-acetamido-3,6-di-O-acetyl-2-deoxy-beta-D-glucopyranoside (6), 2-naphthylmethyl 2-aceta-mido-3,4,6-tri-O-acetyl-2-deoxy-beta-D-glucopyranosyl-(1 --> 3)-2,4,6-tri-O-acetyl-beta-D-galactopyranoside (14), 2-naph-thylmethyl2,3,4,6-tetra-O-acetyl-beta-D-galactopyranosyl-(1 --> 3)-2-acetamido-4,6-di- O-acetyl-2-deoxy-alpha-D-galactopyranoside (20), 2-naphthylmethyl 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-beta-D-glucopyranosyl-(1 --> 3)-2-acetamido-4,6-di-O-acetyl-2-deoxy-alpha-D-galactopyranoside (23) and 2-naphthylmethyl 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-beta-D-glu-copyranosyl-(1 --> 6)-2-acetamido-3,4-di-O-acetyl-2-deoxy-alpha-D-galactopyranoside (27). These per-O-acetylated compounds were fed to U-937 cells to test their ability to prime oligosaccharide synthesis, inhibit glycoprotein biosynthesis and alter adhesion to E-selectin expressed on endothelial cells. The results show that 6, 14, and 20 served as substrates for oligosaccharide synthesis. The generation of glycoside-primed glycans altered the formation of glycoproteins on the cell surface and inhibited cell adhesion dependent on E-selectin.
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Affiliation(s)
- A K Sarkar
- Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla 92093, USA
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14
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Aly MR, Ibrahim el-S I, Ashry el-S H, Schmidt RR. Synthesis of lacto-N-neotetraose and lacto-N-tetraose using the dimethylmaleoyl group as amino protective group. Carbohydr Res 1999; 316:121-32. [PMID: 10420591 DOI: 10.1016/s0008-6215(99)00051-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
The disaccharide donor O-[2,3,4,6-tetra-O-acetyl-beta-D- galactopyranosyl)-(1-->4)-3,6-di-O-benzyl-2-deoxy-2-dimethylmaleimido - alpha,beta-D-glucopyranosyl] trichloroacetimidate (7) was prepared by reacting O-(2,3,4,6-tetra-O-acetyl- alpha-D-galactopyranosyl) trichloroacetimidate with tert-butyldimethylsilyl 3,6-di-O-benzyl-2-deoxy-2- dimethylmaleoylamido-glucopyranoside to give the corresponding disaccharide 5. Deprotection of the anomeric center and then reaction with trichloroacetonitrile afforded 7. Reaction of 7 with 3'-O-unprotected benzyl (2,4,6-tri-O-benzyl-beta-D-galactopyranosyl)- (1-->4)-2,3,6-tri-O-benzyl-beta-D-glucopyranoside (8) as acceptor afforded the desired tetrasaccharide benzyl (2,3,4,6-tetra-O-acetyl-beta-D-galactopyranosyl)-(1-->4)-(3,6-di-O- benzyl-2-deoxy-2-dimethylmaleimido-beta-D-glucopyranosyl)-(1-->3)- (2,4,6- tri-O-benzyl-beta-D-galactopyranosyl)-(1-->4)-2,3,6-tri-O-benzyl-beta-D- glucopyranoside. Replacement of the N-dimethylmaleoyl group by the acetyl group, O-debenzylation and finally O-deacetylation gave lacto-N-neotetraose. Similarly, reaction of O-[(2,3,4,6-tetra-O-acetyl-beta- D-galactopyranosyl)-(1-->3)-4,6-O-benzylidene-2-deoxy-2-dimethylmalei mido- alpha,beta-D-glycopyranosyl] trichloroacetimidate as donor with 8 as acceptor afforded the desired tetrasaccharide benzyl (2,3,4,6-tetra-O-acetyl-beta-D- galactopyranosyl)-(1-->3)-(4,6-benzylidene-2-deoxy-2-dimethylmaleimid o- beta-D-glucopyranosyl)-(1-->3)-(2,4,6-tri-O-benzyl-beta-D-galactopyranos yl)- (1-->4)-2,3,6-tri-O-benzyl-beta-D-glucopyranoside. Removal of the benzylidene group, replacement of the N-dimethylmaleoyl group by the acetyl group and then O-acetylation afforded tetrasaccharide intermediate 15, which carries only O-benzyl and O-acetyl protective groups. O-Debenzylation and O-deacetylation gave lacto-N-tetraose (1). Additionally, known tertbutyldimethylsilyl (2,3,4,6-tetra-O-acetyl-beta-D-galactopyranosyl)-(1-->3)-4,6-O-benzylide ne- 2-deoxy-2-dimethylmaleimido-beta-D-glucopyranoside was transformed into O-[2,3,4,6-tetra-O-acetyl-beta-D-galactopyranosyl)- (1-->3)-4,6-di-O-acetyl-2-deoxy-2-dimethylmaleimido-alpha,beta-D- glucopyranosyl] trichloroacetimidate as glycosyl donor, to afford with 8 as acceptor the corresponding tetrasaccharide 22, which is transformed into 15, thus giving an alternative approach to 1.
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Affiliation(s)
- M R Aly
- Fakultät Chemie, Universität Konstanz, Germany
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15
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Yohino T, Sato K, Wanme F, Takai I, Ishido Y. Efficient catalysis by pyridinium sulfonate in glycosylation involving an oxazoline intermediate derived from per-O-acetyl-N-acetyllactosamine and N,N'-diacetylchitobiose. Glycoconj J 1992; 9:287-91. [PMID: 1305420 DOI: 10.1007/bf00731088] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- T Yohino
- Department of Chemistry, International Christian University, Tokyo, Japan
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16
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Chernyak AYa, Kononov LO, Krishna PR, Kochetkov NK, Rao AV. Synthesis of lysine-containing fragments of the Proteus mirabilis O27 O-specific polysaccharide and neoglycoconjugates therefrom. Carbohydr Res 1992; 225:279-89. [PMID: 1379517 DOI: 10.1016/s0008-6215(00)90501-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Amide-linked lysine mono- and di-uronic acid fragments of the O-specific polysaccharide from P. mirabilis O27 have been synthesised. N epsilon-Boc-L-lysine tert-butyl ester was condensed with 2-azidoethyl glycosides of glucuronic acid and beta-D-GlcpNAc-(1----3)-beta-D-GlcpA. Transformation of the products into 2-acrylamidoethyl glycosides, followed by deprotection using trifluoroacetic acid, gave the target monomers that were converted into high-molecular-weight copolymer-type neoglycoconjugates.
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Affiliation(s)
- Chernyak AYa
- N. D. Zelinsky Institute of Organic Chemistry, Academy of Sciences of the U.S.S.R., Moscow
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17
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Sato S, Ito Y, Ogawa T. A total synthesis of dimeric Lex antigen, III3V3Fuc2nLc6Cer: Pivaloyl auxiliary for stereocontrolled glycosylation. Tetrahedron Lett 1988. [DOI: 10.1016/s0040-4039(00)80733-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Total synthesis of a stage specific embryonic antigen-1 (SSEA-1) a glycoheptaosyl ceramide V3FucnLc6Cer. Tetrahedron Lett 1988. [DOI: 10.1016/s0040-4039(00)80600-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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