1
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King SL, Goth CK, Eckhard U, Joshi HJ, Haue AD, Vakhrushev SY, Schjoldager KT, Overall CM, Wandall HH. TAILS N-terminomics and proteomics reveal complex regulation of proteolytic cleavage by O-glycosylation. J Biol Chem 2018; 293:7629-7644. [PMID: 29593093 PMCID: PMC5961060 DOI: 10.1074/jbc.ra118.001978] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 03/27/2018] [Indexed: 12/31/2022] Open
Abstract
Proteolytic processing is an irreversible post-translational modification functioning as a ubiquitous regulator of cellular activity. Protease activity is tightly regulated via control of gene expression, enzyme and substrate compartmentalization, zymogen activation, enzyme inactivation, and substrate availability. Emerging evidence suggests that proteolysis can also be regulated by substrate glycosylation and that glycosylation of individual sites on a substrate can decrease or, in rare cases, increase its sensitivity to proteolysis. Here, we investigated the relationship between site-specific, mucin-type (or GalNAc-type) O-glycosylation and proteolytic cleavage of extracellular proteins. Using in silico analysis, we found that O-glycosylation and cleavage sites are significantly associated with each other. We then used a positional proteomic strategy, terminal amine isotopic labeling of substrates (TAILS), to map the in vivo cleavage sites in HepG2 SimpleCells with and without one of the key initiating GalNAc transferases, GalNAc-T2, and after treatment with exogenous matrix metalloproteinase 9 (MMP9) or neutrophil elastase. Surprisingly, we found that loss of GalNAc-T2 not only increased cleavage, but also decreased cleavage across a broad range of other substrates, including key regulators of the protease network. We also found altered processing of several central regulators of lipid homeostasis, including apolipoprotein B and the phospholipid transfer protein, providing new clues to the previously reported link between GALNT2 and lipid homeostasis. In summary, we show that loss of GalNAc-T2 O-glycosylation leads to a general decrease in cleavage and that GalNAc-T2 O-glycosylation affects key regulators of the cellular proteolytic network, including multiple members of the serpin family.
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Affiliation(s)
- Sarah L King
- From the Department of Cellular and Molecular Medicine, Centre for Glycomics, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark and
| | - Christoffer K Goth
- From the Department of Cellular and Molecular Medicine, Centre for Glycomics, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark and
| | - Ulrich Eckhard
- the Centre for Blood Research, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, and Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Hiren J Joshi
- From the Department of Cellular and Molecular Medicine, Centre for Glycomics, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark and
| | - Amalie D Haue
- From the Department of Cellular and Molecular Medicine, Centre for Glycomics, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark and
| | - Sergey Y Vakhrushev
- From the Department of Cellular and Molecular Medicine, Centre for Glycomics, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark and
| | - Katrine T Schjoldager
- From the Department of Cellular and Molecular Medicine, Centre for Glycomics, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark and
| | - Christopher M Overall
- the Centre for Blood Research, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, and Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Hans H Wandall
- From the Department of Cellular and Molecular Medicine, Centre for Glycomics, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark and
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2
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Villadsen K, Martos-Maldonado MC, Jensen KJ, Thygesen MB. Chemoselective Reactions for the Synthesis of Glycoconjugates from Unprotected Carbohydrates. Chembiochem 2017; 18:574-612. [DOI: 10.1002/cbic.201600582] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Klaus Villadsen
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | - Manuel C. Martos-Maldonado
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | - Knud J. Jensen
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | - Mikkel B. Thygesen
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
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3
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Yang W, Yoshida K, Yang B, Huang X. Obstacles and solutions for chemical synthesis of syndecan-3 (53-62) glycopeptides with two heparan sulfate chains. Carbohydr Res 2016; 435:180-194. [PMID: 27810711 PMCID: PMC5110403 DOI: 10.1016/j.carres.2016.10.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 10/18/2016] [Accepted: 10/19/2016] [Indexed: 12/21/2022]
Abstract
Proteoglycans play critical roles in many biological events. Due to their structural complexities, strategies towards synthesis of this class of glycopeptides bearing well-defined glycan chains are urgently needed. In this work, we give the full account of the synthesis of syndecan-3 glycopeptide (53-62) containing two different heparan sulfate chains. For assembly of glycans, a convergent 3+2+3 approach was developed producing two different octasaccharide amino acid cassettes, which were utilized towards syndecan-3 glycopeptides. The glycopeptides presented many obstacles for post-glycosylation manipulation, peptide elongation, and deprotection. Following screening of multiple synthetic sequences, a successful strategy was finally established by constructing partially deprotected single glycan chain containing glycopeptides first, followed by coupling of the glycan-bearing fragments and cleavage of the acyl protecting groups.
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Affiliation(s)
- Weizhun Yang
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI 48824, USA
| | - Keisuke Yoshida
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI 48824, USA
| | - Bo Yang
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI 48824, USA
| | - Xuefei Huang
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI 48824, USA.
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4
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Petakamsetty R, Ansari A, Ramapanicker R. Diastereoselective synthesis of furanose and pyranose substituted glycine and alanine derivatives via proline-catalyzed asymmetric α-amination of aldehydes. Carbohydr Res 2016; 435:37-49. [PMID: 27693912 DOI: 10.1016/j.carres.2016.09.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 08/30/2016] [Accepted: 09/20/2016] [Indexed: 01/06/2023]
Abstract
A concise organocatalytic route toward the synthesis of furanose and pyranose substituted glycine and alanine derivatives is reported. These compounds are core structural units of some of the naturally available antibiotics and antifungal agents. Proline-catalyzed asymmetric α-amination of aldehydes derived from sugars is used as the key reaction to synthesize twelve sugar amino acid derivatives. The asymmetric transformations proceeded in good yields and with good to excellent diastereoselectivity. The application of the synthesized amino acids is demonstrated by synthesizing a tripeptide containing one of them.
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Affiliation(s)
- Ramu Petakamsetty
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Anas Ansari
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Ramesh Ramapanicker
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
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5
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Mezei PD, Csonka GI. Unified picture for the conformation and stabilization of the O-glycosidic linkage in glycopeptide model structures. Struct Chem 2015. [DOI: 10.1007/s11224-015-0666-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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6
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Roy R, Palanivel AK, Mallick A, Vankar YD. AuCl3- and AuCl3-Phenylacetylene-Catalyzed Glycosylations by Using Glycosyl Trichloroacetimidates. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500137] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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7
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Rodriguez MC, Cudic M. Optimization of physicochemical and pharmacological properties of peptide drugs by glycosylation. Methods Mol Biol 2013; 1081:107-136. [PMID: 24014437 DOI: 10.1007/978-1-62703-652-8_8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Many biological interactions and functions are mediated by glycans, leading to the emerging importance of carbohydrate and glycoconjugate chemistry in the design of novel drug therapeutics. In addition to direct effects on biological activity, sugar addition appears to alter many physicochemical and pharmacological properties of the peptide backbone. Consequently, glycosylation has been often used to improve various less than optimal features of peptide drug leads.In order to study the effects that naturally occurring and/or nonnatural glycans have on peptide drug solubility, conformation, proteolytic resistance, membrane permeability, and toxicity, it is essential to have convenient synthetic access toward synthesis of glycopeptide analogs. The crucial step in the synthesis of glycopeptides is the introduction of the carbohydrate group. The preformed glycosyl amino acid building block is the most commonly employed approach used in glycopeptide synthesis.In this review, we will describe various synthetic approaches to prepare N- and O-glycopeptides bearing simple monosaccharides as a tool to improve peptide therapeutic efficacy by glycosylation.
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Affiliation(s)
- Maria C Rodriguez
- Torrey Pines Institute for Molecular Studies, Port St. Lucie, FL, USA
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8
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Convergent Solid-Phase Synthesis of N-Glycopeptides Facilitated by Pseudoprolines at Consensus-Sequence Ser/Thr Residues. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204272] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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9
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Ullmann V, Rädisch M, Boos I, Freund J, Pöhner C, Schwarzinger S, Unverzagt C. Convergent solid-phase synthesis of N-glycopeptides facilitated by pseudoprolines at consensus-sequence Ser/Thr residues. Angew Chem Int Ed Engl 2012; 51:11566-70. [PMID: 22945377 DOI: 10.1002/anie.201204272] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Indexed: 01/20/2023]
Affiliation(s)
- Vera Ullmann
- Bioorganische Chemie, Gebäude NW1, Universität Bayreuth, 95440 Bayreuth, Germany
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10
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Minond D, Cudic M, Bionda N, Giulianotti M, Maida L, Houghten RA, Fields GB. Discovery of novel inhibitors of a disintegrin and metalloprotease 17 (ADAM17) using glycosylated and non-glycosylated substrates. J Biol Chem 2012; 287:36473-87. [PMID: 22927435 DOI: 10.1074/jbc.m112.389114] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A disintegrin and metalloprotease (ADAM) proteases are implicated in multiple diseases, but no drugs based on ADAM inhibition exist. Most of the ADAM inhibitors developed to date feature zinc-binding moieties that target the active site zinc, which leads to a lack of selectivity and off-target toxicity. We hypothesized that secondary binding site (exosite) inhibitors should provide a viable alternative to active site inhibitors. Potential exosites in ADAM structures have been reported, but no studies describing substrate features necessary for exosite interactions exist. Analysis of ADAM cognate substrates revealed that glycosylation is often present in the vicinity of the scissile bond. To study whether glycosylation plays a role in modulating ADAM activity, a tumor necrosis factor α (TNFα) substrate with and without a glycan moiety attached was synthesized and characterized. Glycosylation enhanced ADAM8 and -17 activities and decreased ADAM10 activity. Metalloprotease (MMP) activity was unaffected by TNFα substrate glycosylation. High throughput screening assays were developed using glycosylated and non-glycosylated substrate, and positional scanning was conducted. A novel chemotype of ADAM17-selective probes was discovered from the TPIMS library (Houghten, R. A., Pinilla, C., Giulianotti, M. A., Appel, J. R., Dooley, C. T., Nefzi, A., Ostresh, J. M., Yu, Y., Maggiora, G. M., Medina-Franco, J. L., Brunner, D., and Schneider, J. (2008) Strategies for the use of mixture-based synthetic combinatorial libraries. Scaffold ranking, direct testing in vivo, and enhanced deconvolution by computational methods. J. Comb. Chem. 10, 3-19; Pinilla, C., Appel, J. R., Borràs, E., and Houghten, R. A. (2003) Advances in the use of synthetic combinatorial chemistry. Mixture-based libraries. Nat. Med. 9, 118-122) that preferentially inhibited glycosylated substrate hydrolysis and spared ADAM10, MMP-8, and MMP-14. Kinetic studies revealed that ADAM17 inhibition occurred via a non-zinc-binding mechanism. Thus, modulation of proteolysis via glycosylation may be used for identifying novel, potentially exosite binding compounds. The newly described ADAM17 inhibitors represent research tools to investigate the role of ADAM17 in the progression of various diseases.
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Affiliation(s)
- Dmitriy Minond
- Torrey Pines Institute for Molecular Studies, Port St. Lucie, Florida 34987, USA.
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11
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Microwave-assisted reaction of glycosylamine with aspartic acid. Amino Acids 2010; 39:599-604. [PMID: 20130939 DOI: 10.1007/s00726-010-0484-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2009] [Accepted: 01/13/2010] [Indexed: 10/19/2022]
Abstract
The synthesis of N-protected glycosyl amino acids from amines has been investigated and it was found that, under microwave conditions, glycosylamines could be hydrolyzed leading to new products containing a glycosyl ester linkage. The efficiency of the microwave-induced glycosylation of aspartic acid was studied comparing the microwave activity between amide and ester bond formation. Different sugar moieties have been employed to demonstrate the simple and reproducible coupling methodology. New glycosyl ester compounds were further characterized by NMR spectroscopy.
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12
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Affiliation(s)
- David P Gamblin
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, United Kingdom
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13
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Wang LX, Song H, Liu S, Lu H, Jiang S, Ni J, Li H. Chemoenzymatic Synthesis of HIV-1 gp41 Glycopeptides: Effects of Glycosylation on the Anti-HIV Activity and α-Helix Bundle-Forming Ability of Peptide C34. Chembiochem 2005; 6:1068-74. [PMID: 15883971 DOI: 10.1002/cbic.200400440] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
C34 is a 34-mer peptide derived from the C-terminal ectodomain of HIV-1 envelope glycoprotein, gp41. The C34 region in native gp41 carries a conserved N-glycan at Asn637 and the sequence is directly involved in the virus-host membrane fusion, an essential step for HIV-1 infection. This paper describes the synthesis of glycoforms of C34 which carry a monosaccharide, a disaccharide, and a native oligosaccharide moiety. The synthesis of the glycopeptide which carries a native high-mannose type N-glycan was achieved by a chemoenzymatic approach by using an endoglycosidase-catalyzed oligosaccharide transfer as the key step. The effects of glycosylation on the inhibitory activity and the helix-bundle forming ability of C34 were investigated. It was found that glycosylation moderately decreases the anti-HIV activity of C34 and, in comparison with C34, glyco-C34 forms less compact six-helix bundles with the corresponding N-terminal peptide, N36. This study suggests that conserved glycosylation modulates the anti-HIV activity and conformations of the gp41 C-peptide, C34.
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Affiliation(s)
- Lai-Xi Wang
- Institute of Human Virology, Biotechnology Institute, University of Maryland, 725 W. Lombard Street, Baltimore, MD 21201, USA.
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14
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15
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Takegawa K, Fan JQ. Enzymatic synthesis of neoglycoconjugates by transglycosylation with endo-beta-N-acetylglucosaminidase A. Methods Enzymol 2003; 362:64-74. [PMID: 12968357 DOI: 10.1016/s0076-6879(03)01006-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Affiliation(s)
- Kaoru Takegawa
- Department of Life Sciences, Kagawa University, Mikicho, Kita-gun, Kagawa 761-0795, Japan
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16
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Ichiyanagi T, Takatani M, Sakamoto K, Nakahara Y, Ito Y, Hojo H, Nakahara Y. Synthesis of mucin-type glycopeptide (β hCG 130–145) by on-resin fragment condensation of the glycopeptide segments carrying unmasked oligosaccharides. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00542-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Affiliation(s)
- Benjamin G Davis
- Dyson Perrins Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK.
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18
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Wen S, Guo Z. Unprotected oligosaccharides as phase tags: solution-phase synthesis of glycopeptides with solid-phase workups. Org Lett 2001; 3:3773-6. [PMID: 11700135 DOI: 10.1021/ol0101988] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction--see text] N-Linked glycopeptides were synthesized from glycosyl asparagines containing unprotected oligosaccharides and other simple amino acids by an Fmoc method. The free oligosaccharide chains were used as phase tags to facilitate the product isolation by a precipitation method. Thus, while the elongation of glycopeptides was achieved in a solution of N-methylpyrrolidinone (NMP), the product of each step could be precipitated by adding ether to the reaction mixtures. The strategy also eliminated the final step of carbohydrate deprotection in glycopeptide synthesis.
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Affiliation(s)
- S Wen
- Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA
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19
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Fujita K, Takegawa K. Chemoenzymatic synthesis of neoglycoproteins using transglycosylation with endo-beta-N-acetylglucosaminidase A. Biochem Biophys Res Commun 2001; 282:678-82. [PMID: 11401514 DOI: 10.1006/bbrc.2001.4631] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A novel chemoenzymatic approach to synthesize neoglycoproteins containing high-mannose-type oligosaccharides is described. p-Isothiocyanatophenyl-beta-d-glucopyranoside (Glc-ITC) was transferred to the reducing end of the high-mannose-type oligosaccharides using a transglycosylation activity of endo-beta-N-acetylglucosaminidase A (Endo-A). A novel oligosaccharide, Man(6)GlcNAc-Glc-ITC, was synthesized as a coupling reagent for lysyl and N-terminal residues of the protein moiety. The neoglycoconjugate was coupled with several nonglycosylated proteins such as ribonuclease A, lysozyme, and alpha-lactalbumin. Between one and four high-mannose-type oligosaccharides were incorporated per molecule of these proteins. This method should be very useful for the synthesis of neoglycoproteins with homogeneous high-mannose-type oligosaccharides.
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Affiliation(s)
- K Fujita
- Department of Life Sciences, Kagawa University, Miki-cho, Kagawa, 761-0795, Japan
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20
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Dondoni A, Marra A, Scherrmann MC, Bertolasi V. Chemical synthesis of linear and cyclic unnatural oligosaccharides by iterative glycosidation of ketoses. Chemistry 2001; 7:1371-82. [PMID: 11330889 DOI: 10.1002/1521-3765(20010401)7:7<1371::aid-chem1371>3.0.co;2-j] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The development of an efficient method for the stereoselective synthesis of alpha-D-(2-->1)-linked ketoside oligomers is described. The method is based on an iterative protocol composed of two key steps: a) the coupling of a thiazolylketosyl phosphite donor with an hydroxymethylketoside acceptor; and b) the introduction of the hydroxy-methyl group at the anomeric carbon atom of the resulting oligomer. To highlight its efficiency, the protocol was used in the assembly of D-galacto-2-heptulopyranose-containing oligoketosides through alpha-(2-->1) linkages up to the pentameric stage. The yield of the isolated oligomers ranged from 48 % in the first cycle to 29% in the fourth cycle. Having employed a pentenyl-substituted hydroxymethylketoside acceptor in the first cycle, all the derived oligomers contained the pentenyl group at their reducing end. This group was exploited to transform the linear oligomers into cyclic products through intramolecular glycosidation. The major product derived from the linear trisaccharide was confirmed by X-ray crystallography to be the cyclotris-(2-->1)-(alpha-D-galacto-2-heptulopyranosyl). The structure of this compound was essentially that of a [9]crown-3 ether bearing three galactopyranose rings spiroanellated in a propellerlike fashion. This arrangement of carbohydrate units linked to the crown ether created a densely alkoxylated cavity suitable for the encapsulation of alkali-metal cations (Li, Na, K, Ca, Mg).
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Affiliation(s)
- A Dondoni
- Dipartimento di Chimica, Laboratorio di Chimica Organica Universitá di Ferrara, Italy.
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21
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Yamamoto K. Chemo-Enzymatic synthesis of bioactive glycopeptide using microbial endoglycosidase. J Biosci Bioeng 2001. [DOI: 10.1016/s1389-1723(01)80307-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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22
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Herzner H, Reipen T, Schultz M, Kunz H. Synthesis of glycopeptides containing carbohydrate and Peptide recognition motifs. Chem Rev 2000; 100:4495-538. [PMID: 11749356 DOI: 10.1021/cr990308c] [Citation(s) in RCA: 236] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- H Herzner
- Johannes Gutenberg-Universität, Institut für Organische Chemie, Duesbergweg 10-14, 55128 Mainz, Germany
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23
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Ando S, Nakahara Y, Ito Y, Ogawa T, Nakahara Y. Solid-phase synthesis of the glycopeptide of human glycophorin AM bearing the consecutive sialyl-T antigen. Carbohydr Res 2000; 329:773-80. [PMID: 11125819 DOI: 10.1016/s0008-6215(00)00235-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Fmoc solid-phase synthesis of the N-terminal glycopentapeptide of human glycophorin AM, bearing the consecutive sialyl-T antigen, was accomplished using glycosylated amino acid building blocks on a weakly acid-labile resin with high efficiency. The benzylated glycopeptide was treated with TMSOTf-thioanisole in TFA and then with aq NaHCO3 to afford the deprotected glycopeptide in good yield.
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Affiliation(s)
- S Ando
- Institute of Physical and Chemical Research (RIKEN), Saitama, Japan
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24
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Abstract
Sialyl-T-glycopeptides were synthesized by solid-phase techniques, using a PEGA resin as the solid support. An appropriately protected building block containing alpha-Neu5Ac-(2 --> 3)-beta-Gal-(1 --> 3)-alpha-GalN3-(1-->) attached to Fmoc-Thr/Ser-OPfp was employed in a solid phase glycopeptide assembly of a 10-mer glycopeptide, using a general Fmoc/OPfp-ester strategy. Reduction of the azido group of the GalN3 residue was effected on solid-phase, using DTT and DBU. After acidolytic cleavage from the resin, the methyl ester of the sialic acid residue and acetyl groups were removed with 30% NaOMe/MeOH in MeOH and water pH 14, at -30 degrees C for 2 h. At this low temperature, the highly basic conditions did not result in any detectable beta-elimination. However, one O-acetyl group, located at the 2-position of the Gal was resistant to hydrolysis. To remove this remaining acetyl group, reaction with hydrazine hydrate in CHCl3 and MeOH at room temperature for 2.5 h was successful. The two target sequences of sialyl-T-glycopeptides were obtained in good yield. In contrast to the the analogs carrying the T-antigen, the Sial-T-glycopeptides were nonimmunogenic, supporting the idea that the sialylation is a method of circumventing the recognition by the immune system.
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Affiliation(s)
- S Komba
- Carlsberg Laboratory, Department of Chemistry, Valby, Copenhagen, Denmark
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25
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26
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Diastereoselective synthesis of β-(3,4,6-tri-O-benzyl-2-deoxy-β-D-galactopyranosyl)-N-tert-butoxycarbonyl-D-alanine. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00306-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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27
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Lowary T, Meldal M, Helmboldt A, Vasella A, Bock K. Novel Type of Rigid C-Linked Glycosylacetylene−Phenylalanine Building Blocks for Combinatorial Synthesis of C-linked Glycopeptides. J Org Chem 1998. [DOI: 10.1021/jo980517h] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Todd Lowary
- Carlsberg Laboratory, Department of Chemistry, Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark, and Institute of Organic Chemistry, ETH-Center, Universitätstrasse 16, CH-8092 Zürich, Switzerland
| | - Morten Meldal
- Carlsberg Laboratory, Department of Chemistry, Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark, and Institute of Organic Chemistry, ETH-Center, Universitätstrasse 16, CH-8092 Zürich, Switzerland
| | - Arnim Helmboldt
- Carlsberg Laboratory, Department of Chemistry, Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark, and Institute of Organic Chemistry, ETH-Center, Universitätstrasse 16, CH-8092 Zürich, Switzerland
| | - Andrea Vasella
- Carlsberg Laboratory, Department of Chemistry, Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark, and Institute of Organic Chemistry, ETH-Center, Universitätstrasse 16, CH-8092 Zürich, Switzerland
| | - Klaus Bock
- Carlsberg Laboratory, Department of Chemistry, Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark, and Institute of Organic Chemistry, ETH-Center, Universitätstrasse 16, CH-8092 Zürich, Switzerland
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28
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Seeberger PH, Danishefsky SJ. Solid-Phase Synthesis of Oligosaccharides and Glycoconjugates by the Glycal Assembly Method: A Five Year Retrospective. Acc Chem Res 1998. [DOI: 10.1021/ar9600648] [Citation(s) in RCA: 93] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter H. Seeberger
- Laboratory For Bioorganic Chemistry, Sloan-Kettering Institute For Cancer Research, Box 106, 1275 York Avenue, New York, New York 10021, and Department of Chemistry, Havemeyer Hall, Columbia University, New York, New York 10027
| | - Samuel J. Danishefsky
- Laboratory For Bioorganic Chemistry, Sloan-Kettering Institute For Cancer Research, Box 106, 1275 York Avenue, New York, New York 10021, and Department of Chemistry, Havemeyer Hall, Columbia University, New York, New York 10027
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29
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Satyanarayana J, Gururaja TL, Naganagowda GA, Ramasubbu N, Levine MJ. A concise methodology for the stereoselective synthesis of O-glycosylated amino acid building blocks: complete 1H NMR assignments and their application in solid-phase glycopeptide synthesis. THE JOURNAL OF PEPTIDE RESEARCH : OFFICIAL JOURNAL OF THE AMERICAN PEPTIDE SOCIETY 1998; 52:165-79. [PMID: 9774229 DOI: 10.1111/j.1399-3011.1998.tb01473.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A facile strategy for the stereoselective synthesis of suitably protected O-glycosylated amino acid building blocks, namely, Nalpha-Fmoc-Ser-[Ac4-beta-D-Gal-(1-3)-Ac2-alpha or beta-D-GalN3]-OPfp and Nalpha-Fmoc-Thr-[Ac4-beta-D-Gal-(1-3)-Ac2-alpha or beta-D-GalN3]-OPfp is described. What is new and novel in this report is that Koenigs-Knorr type glycosylation of an aglycon serine/threonine derivative (i.e. Nalpha-Fmoc-Ser-OPfp or Nalpha-Fmoc-Thr-OPfp) with protected beta-D-Gal(1-3)-D-GalN3 synthon mediated by silver salts resulted in only alpha- and/or beta-isomers in excellent yields under two different reaction conditions. The subtle differences in stereoselectivity were demonstrated clearly when glycosylation was carried out using only AgClO4 at -40 degrees C which afforded a-isomer in a quantitative yield (alpha:beta = 5:1). On the other hand, the beta-isomer was formed exclusively when the reaction was performed in the presence of Ag2CO3/AgClO4 at room temperature. A complete assignment of 1H resonances to individual sugar ring protons and the characteristic anomeric alpha-1 H and beta-1 H in Ac4Galbeta(1-3)Ac2GalN3 alpha and/or beta linked to Ser/Thr building blocks was accomplished unequivocally by two-dimensional double-quantum filtered correlated spectroscopy and nuclear Overhauser enhancement and exchange spectroscopy NMR experiments. An unambiguous structural characterization and documentation of chemical shifts, including the coupling constants for all the protons of the aforementioned alpha- and beta-isomers of the O-glycosylated amino acid building blocks carrying protected beta-D-Gal(1-3)-D-GalN3, could serve as a template in elucidating the three-dimensional structure of glycoproteins. The synthetic utility of the building blocks and versatility of the strategy was exemplified in the construction of human salivary mucin (MUC7)-derived, O-linked glycopeptides with varied degrees of glycosylation by solid-phase Fmoc chemistry. Fmoc/tert-butyl-based protecting groups were used for the peptidic moieties in conjunction with acetyl sugar protection. The transformation of the 2-azido group into the acetamido derivative was carried out with thioacetic acid on the polymer-bound glycopeptides before the cleavage step. After cleaving the glycopeptide from the resin, the acetyl groups used for sugar OH-protection were removed with sodium methoxide in methanol. Finally, the glycopeptides were purified by reversed-phase high-performance liquid chromatography and their integrity was confirmed by proton NMR as well as by mass spectral analysis. Secondary structure analysis by circular dichroism of both the glycosylated and nonglycosylated peptides revealed that carbohydrates did not exert any profound structural effect on the peptide backbone conformation.
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Affiliation(s)
- J Satyanarayana
- Department of Oral Biology and Dental Research Institute, State University of New York at Buffalo, 14214-3092, USA
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30
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Nakahara Y, Nakahara Y, Ito Y, Ogawa T. Solid-phase synthesis of the B-chain of human alpha 2HS glycoprotein. Carbohydr Res 1998; 309:287-96. [PMID: 9742690 DOI: 10.1016/s0008-6215(98)00142-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The B-chain of human alpha 2HS glycoprotein 1, a heptacosapeptide carrying a trisaccharide (sialyl T) side chain, was synthesized. Prior to the Fmoc-based solid-phase synthesis of the glycopeptide, the benzyl-protected glycosyl serine building block 6 was prepared via beta-stereoselective glycosylation of the 2-azido-2-deoxygalactosyl serine 11 with the sialyl galactosyl trichloroacetimidate 9. An automated peptide synthesizer was efficiently used for the elongation of the entire peptide chain except for the coupling with 6. The synthesized glycopeptide was cleaved from the resin by the TFA method. The resultant mixture of the benzylated glycopeptides was treated with TMSOTf-thioanisole in TFA and then with aq NaHCO3 and 1,4-dithiothreitol to give 1.
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Affiliation(s)
- Y Nakahara
- Department of Industrial Chemistry, Tokai University, Kanagawa, Japan.
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31
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Abstract
Carbohydrate-based combinatorial libraries are tremendously valuable for studying the role of sugars in biology and for expanding accessible molecular diversity needed in broad-based drug screening programs. This review discusses the issues that are relevant to the successful implementation of comprehensive carbohydrate-based combinatorial library programs. In addition, details of oligosaccharide and glycoconjugate libraries constructed using both solid phase and solution phase strategies are presented.
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Affiliation(s)
- M J Sofia
- Transcell Technologies Inc., Cranbury, NJ 08512, USA
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32
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Roberge JY, Beebe X, Danishefsky SJ. Convergent Synthesis of N-Linked Glycopeptides on a Solid Support. J Am Chem Soc 1998. [DOI: 10.1021/ja9740071] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Y. Roberge
- Contribution from Laboratory for Bioorganic Chemistry, Sloan-Kettering Institute for Cancer Research, 1275 York Avenue, Box 106, New York, New York 10021 and Department of Chemistry, Columbia University, New York, New York 10027
| | - X. Beebe
- Contribution from Laboratory for Bioorganic Chemistry, Sloan-Kettering Institute for Cancer Research, 1275 York Avenue, Box 106, New York, New York 10021 and Department of Chemistry, Columbia University, New York, New York 10027
| | - S. J. Danishefsky
- Contribution from Laboratory for Bioorganic Chemistry, Sloan-Kettering Institute for Cancer Research, 1275 York Avenue, Box 106, New York, New York 10021 and Department of Chemistry, Columbia University, New York, New York 10027
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33
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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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34
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35
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Reis CA, Sørensen T, Mandel U, David L, Mirgorodskaya E, Roepstorff P, Kihlberg J, Hansen JE, Clausen H. Development and characterization of an antibody directed to an alpha-N-acetyl-D-galactosamine glycosylated MUC2 peptide. Glycoconj J 1998; 15:51-62. [PMID: 9530956 DOI: 10.1023/a:1006939432665] [Citation(s) in RCA: 244] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In an attempt to raise anti-Tn antibodies, an alpha-N-acetyl-D-galactosamine glycosylated peptide based on the tandem repeat of the intestinal mucin MUC2 was used as an immunogen. The MUC2 peptide (PTTTPISTTTMVTPTPTPTC) was glycosylated in vitro using concentrated alpha-N-acetylgalactosaminyltransferases activity from porcine submaxillary glands which resulted in the incorporation of 8-9 mol of Ga/NAc. Rabbits and mice developed specific anti-MUC2-GalNAc glycopeptide antibodies and no detectable anti-Tn antibodies. Anti-glycopeptide antibodies did not show reactivity with the unglycosylated MUC2 peptide or with other GalNAc glycosylated peptides. A mouse monoclonal antibody (PMH1) representative of the observed immune response was generated and its immunohistological reactivity analysed in normal tissues. PMH1 reacted similarly to other anti-MUC2 peptide antibodies. However, in some cells the staining was not restricted to the supranuclear area but extended to the entire cytoplasm. In addition, PMH1 reacted with purified colonic mucin by Western blot analysis suggesting that PMH1 reacted with some glycoforms of MUC2. The present work presents a useful approach for development of anti-mucin antibodies directed to different glycoforms of individual mucins.
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Affiliation(s)
- C A Reis
- School of Dentistry, Faculty of Health Sciences, Copenhagen, Denmark
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36
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Meldal M, St Hilaire PM. Synthetic methods of glycopeptide assembly, and biological analysis of glycopeptide products. Curr Opin Chem Biol 1997; 1:552-63. [PMID: 9667891 DOI: 10.1016/s1367-5931(97)80052-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The technology of glycopeptide synthesis has recently developed into a fully mature science capable of creating diverse glycopeptides of biological interest, even in combinatorial displays. This has allowed biochemists to investigate substrate specificity in the biosynthetic processing and immunology of various protein glycoforms. The construction of all the mucin core structures and a variety of cancer-related glycopeptides has facilitated detailed analysis of the interaction between MHC-bound glycopeptides and T cell receptors. Novel dendritic neoglycopeptide ligands have been shown to demonstrate high affinity for carbohydrate receptors and these interactions are highly dendrimer specific. Large complex N-linked oligosaccharides have been introduced into glycopeptides using synthetic or chemoenzymatic procedures, both methods affording pure glycopeptides corresponding to a single glycoform in preparative quantities. The improved availability of glycosyl transferases has led to increased use of chemoenzymatic synthesis. Chemical ligation has been introduced as a method of attaching glycans to peptide templates. Combinatorial synthesis and the analysis of resin-bound glycopeptide libraries have been successfully carried out by applying the ladder synthesis principle. Direct quantitative glycosylation of peptide templates on solid phase has paved the way for the synthesis of templated glycopeptide mixtures as libraries of libraries.
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Affiliation(s)
- M Meldal
- Carlsberg Laboratory, Department of Chemistry, Gamle Carlsberg Vej 10, DK-2500, Valby, Copenhagen, Denmark.
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37
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Yamamoto K, Fujimori K, Haneda K, Mizuno M, Inazu T, Kumagai H. Chemoenzymatic synthesis of a novel glycopeptide using a microbial endoglycosidase. Carbohydr Res 1997; 305:415-22. [PMID: 9648260 DOI: 10.1016/s0008-6215(97)10018-0] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The chemoenzymatic synthesis of a glycopeptide by chemical synthesis of N-acetylglucosaminyl peptide and enzymatic transfer of an oligosaccharide is described. We synthesized glycosylated Peptide T which blocks infection of human T cells by human immunodeficiency virus. The first step of the chemoenzymatic method is the solid-phase chemical synthesis of N-acetylglucosaminyl Peptide T (Ala-Ser-Thr-Thr-Thr-Asn(GlcNAc)-Tyr-Thr) with an N-acetylglucosamine moiety bound to the asparaginyl residue by a solid-phase method. This product was prepared in high yield by the dimethylphosphinothioic mixed anhydride method without protecting the hydroxyl functions of the sugar moiety using Fmoc-N-acetylglucosaminyl asparagine instead of Fmoc-asparagine. The second step was transglycosylation of complex type oligosaccharide to N-acetylglucosaminyl Peptide T by a microbial endoglycosidase. The endo-beta-N-acetylglucosaminidase of Mucor hiemalis transfer the oligosaccharide of human transferrin glycopeptide to N-acetylglucosaminyl Peptide T. The transglycosylation product was confirmed to be the glycosylated Peptide T with a sialo biantennary complex type oligosaccharide by mass spectrometry. The glycosylated Peptide T was highly stable against proteolysis in comparison to native Peptide T and N-acetylglucosaminyl Peptide T.
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Affiliation(s)
- K Yamamoto
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Japan.
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38
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Wang LX, Tang M, Suzuki T, Kitajima K, Inoue Y, Inoue S, Fan JQ, Lee YC. Combined Chemical and Enzymatic Synthesis of a C-Glycopeptide and Its Inhibitory Activity toward Glycoamidases. J Am Chem Soc 1997. [DOI: 10.1021/ja9712027] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lai-Xi Wang
- Contribution from the Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218, and Department of Biophysics and Biochemistry, University of Tokyo, Tokyo 113, Japan
| | - Mei Tang
- Contribution from the Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218, and Department of Biophysics and Biochemistry, University of Tokyo, Tokyo 113, Japan
| | - Tadashi Suzuki
- Contribution from the Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218, and Department of Biophysics and Biochemistry, University of Tokyo, Tokyo 113, Japan
| | - Ken Kitajima
- Contribution from the Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218, and Department of Biophysics and Biochemistry, University of Tokyo, Tokyo 113, Japan
| | - Yasuo Inoue
- Contribution from the Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218, and Department of Biophysics and Biochemistry, University of Tokyo, Tokyo 113, Japan
| | - Sadako Inoue
- Contribution from the Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218, and Department of Biophysics and Biochemistry, University of Tokyo, Tokyo 113, Japan
| | - Jian-Qiang Fan
- Contribution from the Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218, and Department of Biophysics and Biochemistry, University of Tokyo, Tokyo 113, Japan
| | - Yuan C. Lee
- Contribution from the Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218, and Department of Biophysics and Biochemistry, University of Tokyo, Tokyo 113, Japan
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39
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Rodriguez EC, Winans KA, King DS, Bertozzi CR. A Strategy for the Chemoselective Synthesis of O-Linked Glycopeptides with Native Sugar−Peptide Linkages. J Am Chem Soc 1997. [DOI: 10.1021/ja971633p] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elena C. Rodriguez
- Department of Chemistry and Howard Hughes Medical Institute University of California, Berkeley, California 94720
| | - Katharine A. Winans
- Department of Chemistry and Howard Hughes Medical Institute University of California, Berkeley, California 94720
| | - David S. King
- Department of Chemistry and Howard Hughes Medical Institute University of California, Berkeley, California 94720
| | - Carolyn R. Bertozzi
- Department of Chemistry and Howard Hughes Medical Institute University of California, Berkeley, California 94720
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40
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Nakahara Y, Nakahara Y, Ito Y, Ogawa T. Total synthesis of B-chain of human α2HS glycoprotein. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01718-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Guo ZW, Nakahara Y, Nakahara Y, Ogawa T. Solid-phase synthesis of CD52 glycopeptide and an efficient route to Asn-core pentasaccharide conjugate. Bioorg Med Chem 1997; 5:1917-24. [PMID: 9370036 DOI: 10.1016/s0968-0896(97)00126-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The intact peptide sequence (18) as well as its glycoform carrying an N-linked core pentasaccharide (1) of CD52 antigen were prepared by means of solid-phase synthesis employing Fmoc-amino acids and benzyl-protected oligosaccharide-asparagine conjugate (3) as building blocks. It was concluded that the pentasaccharide structure had little influence on further peptide elongation in solid-phase synthesis and the benzylated pentasaccharide moiety was sufficiently stable to the 95% TFA acidic conditions used to release glycopeptide from the supporting resin. The paper also describes an efficient route leading to asparagine-core pentasaccharide conjugate (3) which was prepared in seven steps for an overall yield of 23% from monosaccharide units 5, 6, 7 and 8.
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Affiliation(s)
- Z W Guo
- Institute of Physical and Chemical Research (RIKEN), Saitama, Japan
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42
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Guo ZW, Nakahara Y, Nakahara Y, Ogawa T. Solid-phase synthesis of a glycosylated peptide fragment of the IL-8 receptor containing two vicinal oligosaccharide chains. Carbohydr Res 1997; 303:373-7. [PMID: 9373941 DOI: 10.1016/s0008-6215(97)00180-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Z W Guo
- Institute of Physical and Chemical Research (RIKEN), Saitama, Japan
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43
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Schleyer A, Meldal M, Renil M, Paulsen H, Bock K. Direkte Festphasen-Glycosylierung von Peptiden an einem neuartigen Polyethylenglycol-Harz. Angew Chem Int Ed Engl 1997. [DOI: 10.1002/ange.19971091814] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Huang X, Barchi JJ, Lung FD, Roller PP, Nara PL, Muschik J, Garrity RR. Glycosylation affects both the three-dimensional structure and antibody binding properties of the HIV-1IIIB GP120 peptide RP135. Biochemistry 1997; 36:10846-56. [PMID: 9312273 DOI: 10.1021/bi9703655] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We have prepared glycosylated analogues of the principal neutralizing determinant of gp120 and studied their conformations by NMR and circular dichroism spectroscopies. The 24-residue peptide from the HIV-1IIIB isolate (residues 308-331) designated RP135, which contains the immunodominant tip of the V3 loop, was glycosylated with both N- and O-linked sugars. The structures of two glycopeptides, one with an N-linked beta-glucosamine (RP135NG) and the other with two O-linked alpha-galactosamine units (RP135digal), were studied by NMR and circular dichroism spectroscopies. Molecular dynamics calculations based on the NMR data obtained in water solutions were performed to explore the conformational substates sampled by the glycopeptides. The data showed that covalently linking a carbohydrate to the peptide has a major effect on the local conformation and imparts additional minor changes at more distant sites of partially defined secondary structure. In particular, the transient beta-type turn comprised of the -Gly-Pro-Gly-Arg- segment at the "tip" of the V3 loop is more highly populated in RP135digal that in the native peptide and N-linked analogue. Binding data for the glycopeptides with 0.5beta, a monoclonal antibody mapped to the RP135 sequence, revealed a significant enhancement in binding for RP135digal as compared with the native peptide, whereas binding was reduced for the N-linked glycopeptide. These data show that glycosylation of V3 loop peptides can affect their conformations as well as their interactions with antibodies. The design of more ordered and biologically relevant conformations of immunogenic regions from gp120 may aid in the design of more effective immunogens for HIV-1 vaccine development.
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Affiliation(s)
- X Huang
- Laboratory of Medicinal Chemistry, Division of Basic Sciences, National Cancer Institute, Bethesda, Maryland 20892, USA
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45
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46
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Sutherlin DP, Armstrong RW. Synthesis of 12 Stereochemically and Structurally Diverse C-Trisaccharides. J Org Chem 1997. [DOI: 10.1021/jo9621534] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel P. Sutherlin
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095
| | - Robert W. Armstrong
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095
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47
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Unverzagt C. Building blocks for glycoproteins: Synthesis of the ribonuclease B fragment 21–25 containing an undecasaccharide N-glycan. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01278-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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48
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Guo ZW, Nakahara Y, Nakahara Y, Ogawa T. Festphasensynthese des Glycopeptidteils des Antigens CD52 mit N-gebundenem Core-Pentasaccharid. Angew Chem Int Ed Engl 1997. [DOI: 10.1002/ange.19971091317] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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49
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A practical and efficient synthesis of complex-type biantennary heptasaccharide-asparagine conjugate, a key building block for the synthesis of complex N-linked glycopeptides. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01036-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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50
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Burkhart F, Hoffmann M, Kessler H. Stereoselektive Synthese eines C-glycosidischen Analogons desN-Glucoasparagins. Angew Chem Int Ed Engl 1997. [DOI: 10.1002/ange.19971091115] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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