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Abboud SA, Amoura M, Madinier J, Renoux B, Papot S, Piller V, Aucagne V. Enzyme‐Cleavable Linkers for Protein Chemical Synthesis through Solid‐Phase Ligations. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103768] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Skander A. Abboud
- Centre de Biophysique Moléculaire CNRS UPR 4301 Rue Charles Sadron 45071 Orléans cedex 2 France
| | - Mehdi Amoura
- Centre de Biophysique Moléculaire CNRS UPR 4301 Rue Charles Sadron 45071 Orléans cedex 2 France
| | - Jean‐Baptiste Madinier
- Centre de Biophysique Moléculaire CNRS UPR 4301 Rue Charles Sadron 45071 Orléans cedex 2 France
| | - Brigitte Renoux
- Institut de Chimie des Milieux et des Matériaux de Poitiers UMR-CNRS 7285 4 rue Michel Brunet 86073 Poitiers cedex 9 France
| | - Sébastien Papot
- Institut de Chimie des Milieux et des Matériaux de Poitiers UMR-CNRS 7285 4 rue Michel Brunet 86073 Poitiers cedex 9 France
| | - Véronique Piller
- Centre de Biophysique Moléculaire CNRS UPR 4301 Rue Charles Sadron 45071 Orléans cedex 2 France
| | - Vincent Aucagne
- Centre de Biophysique Moléculaire CNRS UPR 4301 Rue Charles Sadron 45071 Orléans cedex 2 France
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2
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Abboud SA, Amoura M, Madinier JB, Renoux B, Papot S, Piller V, Aucagne V. Enzyme-Cleavable Linkers for Protein Chemical Synthesis through Solid-Phase Ligations. Angew Chem Int Ed Engl 2021; 60:18612-18618. [PMID: 34097786 DOI: 10.1002/anie.202103768] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Indexed: 12/26/2022]
Abstract
The total synthesis of long proteins requires the assembly of multiple fragments through successive ligations. The need for intermediate purification steps is a strong limitation, particularly in terms of overall yield. One solution to this problem would be solid-supported chemical ligation (SPCL), for which a first peptide segment must be immobilized on a SPCL-compatible solid support through a linker that can be cleaved under very mild conditions to release the assembled protein. The cleavage of SPCL linkers has previously required chemical conditions sometimes incompatible with sensitive protein targets. Herein, we describe an alternative enzymatic approach to trigger cleavage under extremely mild and selective conditions. Optimization of the linker structure and use of a small enzyme able to diffuse into the solid support were key to the success of the strategy. We demonstrated its utility by the assembly of three peptide segments on the basis of native chemical ligation to afford a 15 kDa polypeptide.
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Affiliation(s)
- Skander A Abboud
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Rue Charles Sadron, 45071, Orléans cedex 2, France
| | - Mehdi Amoura
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Rue Charles Sadron, 45071, Orléans cedex 2, France
| | - Jean-Baptiste Madinier
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Rue Charles Sadron, 45071, Orléans cedex 2, France
| | - Brigitte Renoux
- Institut de Chimie des Milieux et des Matériaux de Poitiers, UMR-CNRS 7285, 4 rue Michel Brunet, 86073, Poitiers cedex 9, France
| | - Sébastien Papot
- Institut de Chimie des Milieux et des Matériaux de Poitiers, UMR-CNRS 7285, 4 rue Michel Brunet, 86073, Poitiers cedex 9, France
| | - Véronique Piller
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Rue Charles Sadron, 45071, Orléans cedex 2, France
| | - Vincent Aucagne
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Rue Charles Sadron, 45071, Orléans cedex 2, France
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3
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Yoshimura Y, Nagashima I, Yokoe T, Kishimoto T, Shimizu H, Chiba Y. A new strategy for the chemoenzymatic synthesis of glycopeptides by De-O-acetylation with an esterase and glycosylations with glycosyltransferases. Carbohydr Res 2020; 492:108023. [PMID: 32388217 DOI: 10.1016/j.carres.2020.108023] [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: 02/28/2020] [Revised: 04/21/2020] [Accepted: 04/26/2020] [Indexed: 10/24/2022]
Abstract
Glycopeptides are fragments of glycoproteins and are important in evaluating the biological roles of carbohydrates in glycoproteins. Fmoc solid-phase peptide synthesis using acetyl-protected glycosylated amino acids is a common strategy for the preparation of glycopeptides, but this approach normally requires chemical de-O-acetylation with a base that β-eliminates sugar residues and epimerizes the peptide backbone. Here we demonstrate a facile new chemoenzymatic synthetic strategy for glycopeptides, using an esterase for the de-O-acetylation of sugar residues and glycosyltransferases for successive sugar elongations at neutral pH.
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Affiliation(s)
- Yayoi Yoshimura
- Japan Bioindustry Association, 2-26-9 Hatchobori, Chuo-ku, Tokyo, 104-0032, Japan; Biotechnology Research Institute for Drug Discovery, Department of Life Science and Biotechnology, Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan.
| | - Izuru Nagashima
- Bioproduction Research Institute, Department of Life Science and Biotechnology, Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan
| | - Takayuki Yokoe
- Bioproduction Research Institute, Department of Life Science and Biotechnology, Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan
| | - Toshimitsu Kishimoto
- Japan Bioindustry Association, 2-26-9 Hatchobori, Chuo-ku, Tokyo, 104-0032, Japan
| | - Hiroki Shimizu
- Bioproduction Research Institute, Department of Life Science and Biotechnology, Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan
| | - Yasunori Chiba
- Biotechnology Research Institute for Drug Discovery, Department of Life Science and Biotechnology, Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan.
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4
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Singh Y, Rodriguez Benavente MC, Al-Huniti MH, Beckwith D, Ayyalasomayajula R, Patino E, Miranda WS, Wade A, Cudic M. Positional Scanning MUC1 Glycopeptide Library Reveals the Importance of PDTR Epitope Glycosylation for Lectin Binding. J Org Chem 2019; 85:1434-1445. [PMID: 31799848 PMCID: PMC7012140 DOI: 10.1021/acs.joc.9b02396] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
One of the main barriers to explaining the functional significance of glycan-based changes in cancer is the natural epitope heterogeneity found on the surface of cancer cells. To help address this knowledge gap, we focused on designing synthetic tools to explore the role of tumor-associated glycans of MUC1 in the formation of metastasis via association with lectins. In this study, we have synthesized for the first time a MUC1-derived positional scanning synthetic glycopeptide combinatorial library (PS-SGCL) that vary in number and location of cancer-associated Tn antigen using the "tea bag" approach. The determination of the isokinetic ratios necessary for the equimolar incorporation of (glyco)amino acids mixtures to resin-bound amino acid was determined, along with developing an efficient protocol for on resin deprotection of O-acetyl groups. Enzyme-linked lectin assay was used to screen PS-SGCL against two plant lectins, Glycine max soybean agglutinin and Vicia villosa. The results revealed a carbohydrate density-dependent affinity trend and site-specific glycosylation requirements for high affinity binding to these lectins. Hence, PS-SGCLs provide a platform to systematically elucidate MUC1-lectin binding specificities, which in the long term may provide a rational design for novel inhibitors of MUC1-lectin interactions involved in tumor spread and glycopeptide-based cancer vaccines.
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Affiliation(s)
- YashoNandini Singh
- From the Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science , Florida Atlantic University , 777 Glades Road , Boca Raton , Florida 33431 , United States
| | - Maria C Rodriguez Benavente
- From the Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science , Florida Atlantic University , 777 Glades Road , Boca Raton , Florida 33431 , United States
| | - Mohammed H Al-Huniti
- From the Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science , Florida Atlantic University , 777 Glades Road , Boca Raton , Florida 33431 , United States
| | - Donella Beckwith
- From the Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science , Florida Atlantic University , 777 Glades Road , Boca Raton , Florida 33431 , United States
| | - Ramya Ayyalasomayajula
- From the Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science , Florida Atlantic University , 777 Glades Road , Boca Raton , Florida 33431 , United States
| | - Eric Patino
- From the Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science , Florida Atlantic University , 777 Glades Road , Boca Raton , Florida 33431 , United States
| | - William S Miranda
- From the Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science , Florida Atlantic University , 777 Glades Road , Boca Raton , Florida 33431 , United States
| | - Alex Wade
- From the Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science , Florida Atlantic University , 777 Glades Road , Boca Raton , Florida 33431 , United States
| | - Maré Cudic
- From the Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science , Florida Atlantic University , 777 Glades Road , Boca Raton , Florida 33431 , United States
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5
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Marcelo F, Supekar N, Corzana F, van der Horst JC, Vuist IM, Live D, Boons GJPH, Smith DF, van Vliet SJ. Identification of a secondary binding site in human macrophage galactose-type lectin by microarray studies: Implications for the molecular recognition of its ligands. J Biol Chem 2018; 294:1300-1311. [PMID: 30504228 DOI: 10.1074/jbc.ra118.004957] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 11/26/2018] [Indexed: 11/06/2022] Open
Abstract
The human macrophage galactose-type lectin (MGL) is a C-type lectin characterized by a unique specificity for terminal GalNAc residues present in the tumor-associated Tn antigen (αGalNAc-Ser/Thr) and its sialylated form, the sialyl-Tn antigen. However, human MGL has multiple splice variants, and whether these variants have distinct ligand-binding properties is unknown. Here, using glycan microarrays, we compared the binding properties of the short MGL 6C (MGLshort) and the long MGL 6B (MGLlong) splice variants, as well as of a histidine-to-threonine mutant (MGLshort H259T). Although the MGLshort and MGLlong variants displayed similar binding properties on the glycan array, the MGLshort H259T mutant failed to interact with the sialyl-Tn epitope. As the MGLshort H259T variant could still bind a single GalNAc monosaccharide on this array, we next investigated its binding characteristics to Tn-containing glycopeptides derived from the MGL ligands mucin 1 (MUC1), MUC2, and CD45. Strikingly, in the glycopeptide microarray, the MGLshort H259T variant lost high-affinity binding toward Tn-containing glycopeptides, especially at low probing concentrations. Moreover, MGLshort H259T was unable to recognize cancer-associated Tn epitopes on tumor cell lines. Molecular dynamics simulations indicated that in WT MGLshort, His259 mediates H bonds directly or engages the Tn-glycopeptide backbone through water molecules. These bonds were lost in MGLshort H259T, thus explaining its lower binding affinity. Together, our results suggest that MGL not only connects to the Tn carbohydrate epitope, but also engages the underlying peptide via a secondary binding pocket within the MGL carbohydrate recognition domain containing the His259 residue.
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Affiliation(s)
- Filipa Marcelo
- Departamento de Química, Faculdade de Ciências e Tecnologia, UCIBIO, REQUIMTE, 2829-516 Caparica, Portugal
| | - Nitin Supekar
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Francisco Corzana
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química, E-26006 Logroño, Spain
| | - Joost C van der Horst
- Department of Molecular Cell Biology and Immunology, Cancer Center Amsterdam, Amsterdam Infection and Immunity Institute, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HZ Amsterdam, The Netherlands
| | - Ilona M Vuist
- Department of Molecular Cell Biology and Immunology, Cancer Center Amsterdam, Amsterdam Infection and Immunity Institute, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HZ Amsterdam, The Netherlands
| | - David Live
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Geert-Jan P H Boons
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - David F Smith
- Department of Biochemistry, Emory Comprehensive Glycomics Center, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Sandra J van Vliet
- Department of Molecular Cell Biology and Immunology, Cancer Center Amsterdam, Amsterdam Infection and Immunity Institute, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HZ Amsterdam, The Netherlands.
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6
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Gunay G, Sardan Ekiz M, Ferhati X, Richichi B, Nativi C, Tekinay AB, Guler MO. Antigenic GM3 Lactone Mimetic Molecule Integrated Mannosylated Glycopeptide Nanofibers for the Activation and Maturation of Dendritic Cells. ACS APPLIED MATERIALS & INTERFACES 2017; 9:16035-16042. [PMID: 28445638 DOI: 10.1021/acsami.7b04094] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The ability of dendritic cells to coordinate innate and adaptive immune responses makes them essential targets for vaccination strategies. Presentation of specific antigens by dendritic cells is required for the activation of the immune system against many pathogens and tumors, and nanoscale materials can be functionalized for active targeting of dendritic cells. In this work, we integrated an immunogenic, carbohydrate melanoma-associated antigen-mimetic GM3-lactone molecule into mannosylated peptide amphiphile nanofibers to target dendritic cells through DC-SIGN receptor. Based on morphological and functional analyses, when dendritic cells were treated with peptide nanofiber carriers, they showed significant increase in antigen internalization and a corresponding increase in the surface expression of the activation and maturation markers CD86, CD83 and HLA-DR, in addition to exhibiting a general morphology consistent with dendritic cell maturation. These results indicate that mannosylated peptide amphiphile nanofiber carriers are promising candidates to target dendritic cells for antigen delivery.
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Affiliation(s)
- Gokhan Gunay
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University , Ankara 06800, Turkey
- Neuroscience Graduate Program, Bilkent University , Ankara 06800, Turkey
| | - Melis Sardan Ekiz
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University , Ankara 06800, Turkey
| | - Xhenti Ferhati
- Department of Chemistry "Ugo Schiff", University of Florence , Sesto Fiorentino, Florence 50019, Italy
| | - Barbara Richichi
- Department of Chemistry "Ugo Schiff", University of Florence , Sesto Fiorentino, Florence 50019, Italy
| | - Cristina Nativi
- Department of Chemistry "Ugo Schiff", University of Florence , Sesto Fiorentino, Florence 50019, Italy
| | - Ayse B Tekinay
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University , Ankara 06800, Turkey
- Neuroscience Graduate Program, Bilkent University , Ankara 06800, Turkey
| | - Mustafa O Guler
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University , Ankara 06800, Turkey
- Institute for Molecular Engineering, University of Chicago , Chicago, Illinois 60637, United States
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7
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Ustun Yaylaci S, Sardan Ekiz M, Arslan E, Can N, Kilic E, Ozkan H, Orujalipoor I, Ide S, Tekinay AB, Guler MO. Supramolecular GAG-like Self-Assembled Glycopeptide Nanofibers Induce Chondrogenesis and Cartilage Regeneration. Biomacromolecules 2016; 17:679-89. [DOI: 10.1021/acs.biomac.5b01669] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Seher Ustun Yaylaci
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Melis Sardan Ekiz
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Elif Arslan
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Nuray Can
- Department
of Orthopaedics and Traumatology, Gulhane Military Medical Academy, Ankara 06010, Turkey
| | | | - Huseyin Ozkan
- Department
of Orthopaedics and Traumatology, Gulhane Military Medical Academy, Ankara 06010, Turkey
| | - Ilghar Orujalipoor
- Department
of Nanotechnology and Nanomedicine and Department of Physics Engineering, Hacettepe University, Ankara 06800, Turkey
| | - Semra Ide
- Department
of Nanotechnology and Nanomedicine and Department of Physics Engineering, Hacettepe University, Ankara 06800, Turkey
| | - Ayse B. Tekinay
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Mustafa O. Guler
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara 06800, Turkey
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8
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Dunne A, Palomo JM. Efficient and green approach for the complete deprotection of O-acetylated biomolecules. RSC Adv 2016. [DOI: 10.1039/c6ra19645d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
This work shows the complete O-deprotection of per-acetylated molecules catalyzed by Aspergillus niger lipase (A-ANL) under very mild conditions.
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Affiliation(s)
- Anthony Dunne
- Departamento de Biocatálisis
- Instituto de Catálisis (CSIC)
- 28049 Madrid
- Spain
| | - Jose M. Palomo
- Departamento de Biocatálisis
- Instituto de Catálisis (CSIC)
- 28049 Madrid
- Spain
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9
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Simerska P, Ziora ZM, Fagan V, Goodwin D, Edrous F, Toth I. Design, synthesis and characterisation of mannosylated ovalbumin lipid core peptide self-adjuvanting vaccine delivery system. Drug Deliv Transl Res 2015; 4:246-55. [PMID: 25786879 DOI: 10.1007/s13346-013-0173-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Peptide-based vaccine delivery can be hampered by rapid peptidase activity and poor inherent immunogenicity. The self-adjuvanting lipid core peptide system (LCP) has been shown to confer improved stability and immunogenicity on peptide epitopes of group A Streptococcus, Chlamydia, hookworm, and malaria pathogens. However, various diseases, including cancer, still require targeted delivery of their vaccine candidates. For this reason, we have selected two model peptides (ovalbumin CD4(+) and/or CD8(+) T cell epitopes), and incorporated two or four copies of either epitope into our LCP vaccine. Optimised glycosylation of ovalbumin peptides yielded 46 % when microwave-assisted double coupling with 2 eq of carbohydrate derivative, activated by N,N-diisopropylethylamine and (O-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate, was performed. All ovalbumin peptides were successfully synthesised and purified in 11-55 % yields by Fmoc- or Boc-chemistry using solid-phase peptide synthesis. The mannosylated ovalbumin peptides were nontoxic to human erythrocytes in haemolytic assay (<2 % haemolysis) and showed increased (up to 20-fold) stability in plasma.
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Affiliation(s)
- Pavla Simerska
- School of Chemistry and Molecular Biosciences, The University of Queensland, Cooper Road, St Lucia, QLD, 4072, Australia,
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10
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Xie N, Taylor CM. Synthesis of Oligomers of β-l-Arabinofuranosides of (4R)-4-Hydroxy-l-proline Relevant to the Mugwort Pollen Allergen, Art v 1. J Org Chem 2014; 79:7459-67. [DOI: 10.1021/jo501191b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Ning Xie
- Department
of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Carol M. Taylor
- Department
of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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11
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Heimburg-Molinaro J, Priest JW, Live D, Boons GJ, Song X, Cummings RD, Mead JR. Microarray analysis of the human antibody response to synthetic Cryptosporidium glycopeptides. Int J Parasitol 2013; 43:901-7. [PMID: 23856596 PMCID: PMC3937990 DOI: 10.1016/j.ijpara.2013.05.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 05/20/2013] [Accepted: 05/22/2013] [Indexed: 12/13/2022]
Abstract
Glycoproteins expressed by Cryptosporidium parvum are immunogenic in infected individuals but the nature of the epitopes recognised in C. parvum glycoproteins is poorly understood. Since a known immunodominant antigen of Cryptosporidium, the 17kDa glycoprotein, has previously been shown to bind to lectins that recognise the Tn antigen (GalNAcα1-Ser/Thr-R), a large number of glycopeptides with different Tn valency and presentation were prepared. In addition, glycopeptides were synthesised based on a 40kDa cryptosporidial antigen, a polymorphic surface glycoprotein with varying numbers of serine residues, to determine the reactivity with sera from C. parvum-infected humans. These glycopeptides and non-glycosylated peptides were used to generate a glycopeptide microarray to allow screening of sera from C. parvum-infected individuals for the presence of IgM and IgG antibodies. IgG but not IgM in sera from C. parvum-infected individuals bound to multivalent Tn antigen epitopes presented on glycopeptides, suggesting that glycoproteins from C. parvum that contain the Tn antigen induce immune responses upon infection. In addition, molecular differences in glycosylated peptides (e.g. substituting Ser for Thr) as well as the site of glycosylation had a pronounced effect on reactivity. Lastly, pooled sera from individuals infected with either Toxoplasma or Plasmodium were also tested against the modified Cryptosporidium peptides and some sera showed specific binding to glycopeptide epitopes. These studies reveal that specific anti-glycopeptide antibodies that recognise the Tn antigen may be useful diagnostically and in defining the roles of parasite glycoconjugates in infections.
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Affiliation(s)
| | - Jeffrey W. Priest
- Division of Foodborne, Waterborne, and Enteric Diseases,
Centers for Disease Control and Prevention, Decatur, GA 30033, USA
| | - David Live
- Complex Carbohydrate Research Center, University of
Georgia, Athens, GA, USA
| | - Geert-Jan Boons
- Complex Carbohydrate Research Center, University of
Georgia, Athens, GA, USA
| | - Xuezheng Song
- Department of Biochemistry, Emory University, Atlanta, GA
30322, USA
| | | | - Jan R. Mead
- Department of Pediatrics, Emory University, Atlanta, GA
30322, USA
- Atlanta VA Medical Center, Decatur, GA 30033, USA
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12
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Barchi JJ. Mucin-Type Glycopeptide Structure in Solution: Past, Present, and Future. Biopolymers 2013; 99:713-23. [DOI: 10.1002/bip.22313] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2013] [Accepted: 06/05/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Joseph J. Barchi
- Chemical Biology Laboratory; Center for Cancer Research, National Cancer Institute at Frederick; Frederick; MD; 21702
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13
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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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14
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Abstract
Because of the importance of carbohydrate-protein interactions in biological processes, the development of glycoclusters and glycodendrimers capable of mimicking the multivalent display of carbohydrates at the cell surface has become a major field of research over the last decade. Among the large variety of scaffolds that are now available, peptides and cyclopeptides are widely used for the multivalent presentation of glycans. This review will provide an overview of the most recent advances in the preparation and utilization of linear glycopeptides and glycocyclopeptides in glycobiology.
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Affiliation(s)
- M Carmen Galan
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
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15
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Borgert A, Heimburg-Molinaro J, Song X, Lasanajak Y, Ju T, Liu M, Thompson P, Ragupathi G, Barany G, Smith DF, Cummings RD, Live D. Deciphering structural elements of mucin glycoprotein recognition. ACS Chem Biol 2012; 7:1031-9. [PMID: 22444368 DOI: 10.1021/cb300076s] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Mucin glycoproteins present a complex structural landscape arising from the multiplicity of glycosylation patterns afforded by their numerous serine and threonine glycosylation sites, often in clusters, and with variations in respective glycans. To explore the structural complexities in such glycoconjugates, we used NMR to systematically analyze the conformational effects of glycosylation density within a cluster of sites. This allows correlation with molecular recognition through analysis of interactions between these and other glycopeptides, with antibodies, lectins, and sera, using a glycopeptide microarray. Selective antibody interactions with discrete conformational elements, reflecting aspects of the peptide and disposition of GalNAc residues, are observed. Our results help bridge the gap between conformational properties and molecular recognition of these molecules, with implications for their physiological roles. Features of the native mucin motifs impact their relative immunogenicity and are accurately encoded in the antibody binding site, with the conformational integrity being preserved in isolated glycopeptides, as reflected in the antibody binding profile to array components.
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Affiliation(s)
| | | | - Xuezheng Song
- Department of Biochemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Yi Lasanajak
- Department of Biochemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Tongzhong Ju
- Department of Biochemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Mian Liu
- Complex Carbohydrate Research
Center, University of Georgia, Athens,
Georgia 30602, United States
| | - Pamela Thompson
- Complex Carbohydrate Research
Center, University of Georgia, Athens,
Georgia 30602, United States
| | - Govind Ragupathi
- Memorial Sloan-Kettering Cancer Center, New York, New York 10065, United States
| | | | - David F. Smith
- Department of Biochemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Richard D. Cummings
- Department of Biochemistry, Emory University, Atlanta, Georgia 30322, United States
| | - David Live
- Complex Carbohydrate Research
Center, University of Georgia, Athens,
Georgia 30602, United States
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16
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Xie N, Taylor CM. Synthesis of a Dimer of β-(1,4)-l-Arabinosyl-(2S,4R)-4-hydroxyproline Inspired by Art v 1, the Major Allergen of Mugwort. Org Lett 2010; 12:4968-71. [DOI: 10.1021/ol102112z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ning Xie
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Carol M. Taylor
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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17
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Liu M, Hamilton DW, Barany G. Solid-phase synthesis and evaluation of glycopeptide fragments from rat epididymal cysteine-rich secretory protein-1 (Crisp-1). Molecules 2010; 15:6399-410. [PMID: 20877231 PMCID: PMC6257669 DOI: 10.3390/molecules15096399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Revised: 08/24/2010] [Accepted: 09/06/2010] [Indexed: 11/29/2022] Open
Abstract
Three 18-residue peptides with the sequence Glp-Asp-Thr-Thr-Asp-Glu-Trp-Asp-Arg-Asp-Leu-Glu-Asn-Leu-Ser-Thr-Thr-Lys, taken from the N-terminus of the rat epididymal cysteine-rich secretory protein (Crisp-1) that is important in the fertilization process, were prepared by Fmoc solid-phase synthesis using a convergent strategy. These peptides were the parent sequence, plus two possible α-O-linked TN antigen-containing glycopeptides with a Thr(α-D-GalNAc) residue in place of either Thr3 or Thr4. During chain assembly, two deletion peptides [des-Asp2 and des-Thr(Ac3-α-D-GalNAc)] and one terminated peptide [N-acetylated 14-mer] arose, as did several peptides in which aspartimide formation had occurred at each of the four possible positions in the sequence. These by-products totaled ~20% of the desired product; they were recognized by HPLC and ESI-MS and removed during the intermediate purifications. Final products, obtained in 15–21% overall yields, were characterized by HPLC purities and ESI-MS. Circular dichroism (CD) spectra for all three purified peptides, recorded in pure water and in trifluoroethanol−H2O (1:1), revealed that the presence of a sugar moiety does not significantly impact the sampled conformations. Future biological evaluation could elucidate the nature and locus of sugar modification of Crisp-1, and provide insight as to why Crisp-1 protein E binds sperm irreversibly, in contrast to protein D that lacks a sugar near the N-terminus and only binds sperm loosely.
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Affiliation(s)
- Mian Liu
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | - David W. Hamilton
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA
| | - George Barany
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1-612-625-1028; Fax: +1-612-626-7541
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18
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Bolscher JGM, Brevoord J, Nazmi K, Ju T, Veerman ECI, van Wijk JAE, Cummings RD, van Die I. Solid-phase synthesis of a pentavalent GalNAc-containing glycopeptide (Tn antigen) representing the nephropathy-associated IgA hinge region. Carbohydr Res 2010; 345:1998-2003. [PMID: 20719305 DOI: 10.1016/j.carres.2010.07.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2010] [Revised: 07/08/2010] [Accepted: 07/12/2010] [Indexed: 11/28/2022]
Abstract
Incomplete or aberrant glycosylation leading to Tn antigen (GalNAcalpha1-Ser/Thr) expression on human glycoproteins is strongly associated with human pathological conditions, including tumors, certain autoimmune diseases, such as the idiopathic IgA nephropathy, and may modulate immune homeostasis. In addition, the Tn antigen is highly expressed by certain pathogens and plays a role in host-pathogen interactions. To enable experimental approaches to study interactions of the Tn antigen with the immune system and analyze anti-Tn antibody responses in infection or disorders, we generated a Tn-expressing resource that can be used for high-throughput screening. In consideration of IgA nephropathy in which the hinge region is incompletely glycosylated, we used this hinge sequence that encodes five potential glycosylation sites as the ideal template for the synthesis of a Tn antigen-expressing glycopeptide. Inclusion of an N-terminal biotin in the peptide enabled binding to streptavidin-coated ELISA plates as monitored using Helix pomatia agglutinin or anti-Tn monoclonal antibody. We also found that the biotinylated IgA-Tn peptide is a functional acceptor for beta1-3-galactosylation using recombinant T-synthase (beta1-3-galactosyltransferase). Besides its immunochemical functionality as a possible diagnostic tool for IgA nephropathy, the peptide is an excellent substrate for glycan elongation and represents a novel template applicable for glycan-antigen-associated diseases.
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Affiliation(s)
- Jan G M Bolscher
- Department of Oral Biochemistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Amsterdam, Van der Boechorststraat 7, NL-1081 BT, The Netherlands.
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19
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Barb AW, Borgert AJ, Liu M, Barany G, Live D. Intramolecular glycan-protein interactions in glycoproteins. Methods Enzymol 2010; 478:365-88. [PMID: 20816490 DOI: 10.1016/s0076-6879(10)78018-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Glycoproteins are a major class of glycoconjugates displaying a variety of mutual interactions between glycan and protein moieties that ultimately affect molecular organization. Modulation of the pendant glycan structures is important in tuning the functions of glycoproteins. Here we discuss structural aspects and some of the challenges to studying intramolecular interactions between carbohydrate and protein elements in several forms of O-linked as well as N-linked glycoproteins. These illustrate the importance of the relationship of context to function in protein glycosylation.
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Affiliation(s)
- Adam W Barb
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
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20
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Song X, Lasanajak Y, Rivera-Marrero C, Luyai A, Willard M, Smith DF, Cummings RD. Generation of a natural glycan microarray using 9-fluorenylmethyl chloroformate (FmocCl) as a cleavable fluorescent tag. Anal Biochem 2009; 395:151-60. [PMID: 19699706 DOI: 10.1016/j.ab.2009.08.024] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2009] [Revised: 08/17/2009] [Accepted: 08/18/2009] [Indexed: 01/20/2023]
Abstract
Glycan microarray technology has become a successful tool for studying protein-carbohydrate interactions, but a limitation has been the laborious synthesis of glycan structures by enzymatic and chemical methods. Here we describe a new method to generate quantifiable glycan libraries from natural sources by combining widely used protease digestion of glycoproteins and Fmoc chemistry. Glycoproteins including chicken ovalbumin, bovine fetuin, and horseradish peroxidase (HRP) were digested by Pronase, protected by FmocCl, and efficiently separated by 2D-HPLC. We show that glycans from HRP glycopeptides separated by HPLC and fluorescence monitoring retained their natural reducing end structures, mostly core alpha1,3-fucose and core alpha1,2-xylose. After simple Fmoc deprotection, the glycans were printed on NHS-activated glass slides. The glycans were interrogated using plant lectins and antibodies in sera from mice infected with Schistosoma mansoni, which revealed the presence of both IgM and IgG antibody responses to HRP glycopeptides. This simple approach to glycopeptide purification and conjugation allows for the development of natural glycopeptide microarrays without the need to remove and derivatize glycans and potentially compromise their reducing end determinants.
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Affiliation(s)
- Xuezheng Song
- Department of Biochemistry, Emory University School of Medicine, O. Wayne Rollins Research Center, 1510 Clifton Road, Suite 4001, Atlanta, GA 30322, USA
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21
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Raman J, Fritz TA, Gerken TA, Jamison O, Live D, Liu M, Tabak LA. The catalytic and lectin domains of UDP-GalNAc:polypeptide alpha-N-Acetylgalactosaminyltransferase function in concert to direct glycosylation site selection. J Biol Chem 2008; 283:22942-51. [PMID: 18562306 PMCID: PMC2517002 DOI: 10.1074/jbc.m803387200] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2008] [Revised: 06/17/2008] [Indexed: 11/06/2022] Open
Abstract
UDP-GalNAc:polypeptide alpha-N-Acetylgalactosaminyltransferases (ppGalNAcTs), a family (EC 2.4.1.41) of enzymes that initiate mucin-type O-glycosylation, are structurally composed of a catalytic domain and a lectin domain. Previous studies have suggested that the lectin domain modulates the glycosylation of glycopeptide substrates and may underlie the strict glycopeptide specificity of some isoforms (ppGalNAcT-7 and -10). Using a set of synthetic peptides and glycopeptides based upon the sequence of the mucin, MUC5AC, we have examined the activity and glycosylation site preference of lectin domain deletion and exchange constructs of the peptide/glycopeptide transferase ppGalNAcT-2 (hT2) and the glycopeptide transferase ppGalNAcT-10 (hT10). We demonstrate that the lectin domain of hT2 directs glycosylation site selection for glycopeptide substrates. Pre-steady-state kinetic measurements show that this effect is attributable to two mechanisms, either lectin domain-aided substrate binding or lectin domain-aided product release following glycosylation. We find that glycosylation of peptide substrates by hT10 requires binding of existing GalNAcs on the substrate to either its catalytic or lectin domain, thereby resulting in its apparent strict glycopeptide specificity. These results highlight the existence of two modes of site selection used by these ppGalNAcTs: local sequence recognition by the catalytic domain and the concerted recognition of distal sites of prior glycosylation together with local sequence binding mediated, respectively, by the lectin and catalytic domains. The latter mode may facilitate the glycosylation of serine or threonine residues, which occur in sequence contexts that would not be efficiently glycosylated by the catalytic domain alone. Local sequence recognition by the catalytic domain differs between hT2 and hT10 in that hT10 requires a pre-existing GalNAc residue while hT2 does not.
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Affiliation(s)
- Jayalakshmi Raman
- Section on Biological Chemistry, NIDDK, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892, USA
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22
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Liu M, Borgert A, Barany G, Live D. Conformational consequences of protein glycosylation: preparation of O-mannosyl serine and threonine building blocks, and their incorporation into glycopeptide sequences derived from alpha-dystroglycan. Biopolymers 2008; 90:358-68. [PMID: 17868094 DOI: 10.1002/bip.20847] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
With the goal to investigate the structural impact of O-mannosyl glycosylation on alpha-dystroglycan, a glycoprotein that has an important role in the extracellular organization of muscle, glycopeptides derived from its mucin-like sequence have been prepared by solid-phase peptide synthesis. Two approaches have been explored to obtain needed mannosylated serine and threonine building blocks. With the alpha-carboxyl group unprotected, and with tetraaceto-1-fluoro-alpha-D-mannose as the sugar donor, the desired alpha-O-mannosyl-Fmoc-Ser/Thr formed, along with mannosyl ester isomers and the species with mannose attached to both hydroxyl and carboxyl functions. Relevant mechanistic questions and stability issues were elucidated. Alternatively, building blocks were made with the alpha-carboxyl protected/activated as the pentafluorophenyl (Pfp) ester. Glycopeptides synthesized herein contained 5-9 residues, and featured one, two, and four consecutive Ser and/or Thr residues O-glycosylated with mannose. Circular dichroism (CD) spectra for Man-containing glycopeptides recorded in water show them to be not well ordered. For one of the alpha-dystroglycan-derived sequences, the comparative conformational consequences of glycosylation by either Man or GalNAc have been examined by CD and NMR, with both methods showing a more organized structure when GalNAc is present.
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Affiliation(s)
- Mian Liu
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
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23
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Pudelko M, Kihlberg J, Elofsson M. Application of gel-phase19F NMR spectroscopy for optimization of solid-phase synthesis of a hydrophobic peptide from the signal sequence of the mucin MUC1. J Pept Sci 2007; 13:354-61. [PMID: 17436345 DOI: 10.1002/psc.850] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This paper describes the manual Fmoc/t-Bu solid-phase synthesis of a difficult nine-residue hydrophobic peptide LLLLTVLTV from one of the signal sequences that flank the tandem repeat of the mucin MUC1. Gel-phase 19F NMR spectroscopy was used as a straightforward method for optimization of the solid-phase synthesis. Different approaches were applied for comparative studies. The strategy based on modified solid-phase conditions using DIC/HOAt for coupling, DBU for Fmoc deprotection, and the incorporation of the pseudo proline dipeptide Fmoc-Leu-Thr(psiMe, Me pro)-OH as a backbone-protecting group was found to be superior according to gel-phase 19F NMR spectroscopy. Implementation of the optimized Fmoc protocol enabled an effective synthesis of signal peptide LLLLTVLTV.
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Affiliation(s)
- Maciej Pudelko
- Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden
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