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Ayyalasomayajula R, Boneva I, Ormaza D, Whyte A, Farook K, Gorlin Z, Yancey E, André S, Kaltner H, Cudic M. Synthesis and Thermodynamic Evaluation of Sialyl-Tn MUC1 Glycopeptides Binding to Macrophage Galactose-Type Lectin. Chembiochem 2024:e202400391. [PMID: 38877657 DOI: 10.1002/cbic.202400391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 05/30/2024] [Accepted: 06/14/2024] [Indexed: 06/16/2024]
Abstract
Interactions between the tumor-associated carbohydrate antigens of Mucin 1 (MUC1) and the carbohydrate-binding proteins, lectins, often lead to the creation of a pro-tumor microenvironment favoring tumor initiation, progression, metastasis, and immune evasion. Macrophage galactose binding lectin (MGL) is a C-type lectin receptor found on antigen-presenting cells that facilitates the uptake of carbohydrate antigens for antigen presentation, modulating the immune response homeostasis, autoimmunity, and cancer. Considering the crucial role of tumor-associated forms of MUC1 and MGL in tumor immunology, a thorough understanding of their binding interaction is essential for it to be exploited for cancer vaccine strategies. The synthesis of MUC1 glycopeptide models carrying a single or multiple Tn and/or sialyl-Tn antigen(s) is described. A novel approach for the sialyl-Tn threonine building block suitable for the solid phase peptide synthesis was developed. The thermodynamic profile of the binding interaction between the human MGL and MUC1 glycopeptide models was analyzed using isothermal titration calorimetry. The measured dissociation constants for the sialyl-Tn-bearing peptide epitopes were consistently lower compared to the Tn antigen and ranged from 10 μM for mono- to 1 μM for triglycosylated MUC1 peptide, respectively. All studied interactions, regardless of the glycan's site of attachment or density, exhibited enthalpy-driven thermodynamics.
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Affiliation(s)
- Ramya Ayyalasomayajula
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL, 33431
| | - Ivet Boneva
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL, 33431
| | - David Ormaza
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL, 33431
| | - Andrew Whyte
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL, 33431
| | - Kamran Farook
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL, 33431
| | - Zachary Gorlin
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL, 33431
| | - Evelyn Yancey
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL, 33431
| | - Sabine André
- Department of Veterinary Sciences, Physiological Chemistry, Ludwig-Maximilians-Universität München, Lena-Christ-Str. 48, 82152, Planegg-Martinsried
| | - Herbert Kaltner
- Department of Veterinary Sciences, Physiological Chemistry, Ludwig-Maximilians-Universität München, Lena-Christ-Str. 48, 82152, Planegg-Martinsried
| | - Maré Cudic
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL, 33431
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Takeuchi Y, Tohda K, Tanaka H. Syntheses of α(2,8) Sialosides Containing NeuAc and NeuGc by Using Double Carbonyl-Protected N-Acyl Sialyl Donors. Chemistry 2024; 30:e202400883. [PMID: 38556469 DOI: 10.1002/chem.202400883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 03/27/2024] [Accepted: 03/30/2024] [Indexed: 04/02/2024]
Abstract
We report on the syntheses of NeuAc and NeuGc-containing glycosides via the use of double carbonyl-protected N-acetyl sialyl donors. The 7-O,9-O-carbonyl protection of an N-acyl-5-N,4-O-carbonyl-protected sialyl donor markedly increased the α-selectivity during glycosylation, particularly when glycosylating the C-8 hydroxyl group of sialic acids. The N-acyl carbamates were selectively opened with ethanethiol under basic conditions to provide N-acyl amines. It is noteworthy that N-glycolyl carbamate was more reactive to nucleophiles by comparison with the N-acetyl carbamate due to the electron-withdrawing oxygen in the N-acyl group and however, allowed selective opening of the carbamates without the loss of N-glycolyl groups. To demonstrate the utility of the approach, we began by synthesizing α(2,3) and α(2,6) sialyl galactosides. Glycosylation of the hydroxy groups of galactosides at the C-6 position with the NeuAc and NeuGc donors provided the corresponding sialyl galactoses in good yields with excellent α-selectivity. However, glycosylation of the 2,3-diol galactosyl acceptor selectively provided Siaα(2,2)Gal. Next, we prepared a series of α(2,8) disialosides composed of NeuAc and NeuGc. Glycosylation of NeuGc and NeuAc acceptors at the C-8 hydroxyl group with NeuGc and NeuAc sialyl donors provided the corresponding α(2,8) disialosides, and no significant differences were detected in the reactivities of these acceptors.
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Affiliation(s)
- Yutaka Takeuchi
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 12-12-1-H101 Ookayama, Meguro, Tokyo, 152-8552, Japan
| | - Kazuki Tohda
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 12-12-1-H101 Ookayama, Meguro, Tokyo, 152-8552, Japan
| | - Hiroshi Tanaka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 12-12-1-H101 Ookayama, Meguro, Tokyo, 152-8552, Japan
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Wang S, Foster SR, Sanchez J, Corcilius L, Larance M, Canals M, Stone MJ, Payne RJ. Glycosylation Regulates N-Terminal Proteolysis and Activity of the Chemokine CCL14. ACS Chem Biol 2021; 16:973-981. [PMID: 33988967 DOI: 10.1021/acschembio.1c00006] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Chemokines are secreted proteins that regulate leukocyte migration during inflammatory responses by signaling through chemokine receptors. Full length CC chemokine ligand 14, CCL14(1-74), is a weak agonist for the chemokine receptor CCR1, but its activity is substantially enhanced upon proteolytic cleavage to CCL14(9-74). CCL14 is O-glycosylated at Ser7, adjacent to the site of proteolytic activation. To determine whether glycosylation regulates the activity of CCL14, we used native chemical ligation to prepare four homogeneously glycosylated variants of CCL14(1-74). Each protein was assembled from three synthetic peptide fragments in "one-pot" using two sequential ligation reactions. We show that while glycosylation of CCL14(1-74) did not affect CCR1 binding affinity or potency of activation, sialylated variants of CCL14(1-74) exhibited reduced activity after treatment with plasmin compared to nonsialylated forms. These data indicate that glycosylation may influence the biological activity of CCL14 by regulating its conversion from the full-length to the truncated, activated form.
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Affiliation(s)
- Siyao Wang
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Simon R. Foster
- Department of Biochemistry & Molecular Biology Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
- Infection & Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Julie Sanchez
- Department of Biochemistry & Molecular Biology Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
- Infection & Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Leo Corcilius
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
- Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, NSW 2006, Australia
| | - Mark Larance
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia
| | - Meritxell Canals
- Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen’s Medical Centre, University of Nottingham, Nottingham NG7 2UH, U.K
- Centre of Membrane Proteins and Receptors, University of Birmingham and University of Nottingham, Midlands, U.K
| | - Martin J. Stone
- Department of Biochemistry & Molecular Biology Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Richard J. Payne
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
- Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, NSW 2006, Australia
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4
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Abstract
Investigations of methodologies aimed on improving the stereoselective synthesis of sialosides and the efficient assembly of sialic acid glycoconjugates has been the mission of dedicated research groups from the late 1960s. This review presents major accomplishments in the field, with the emphasis on significant breakthroughs and influential synthetic strategies of the last decade.
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5
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The cell surface mucin MUC1 limits the severity of influenza A virus infection. Mucosal Immunol 2017; 10:1581-1593. [PMID: 28327617 DOI: 10.1038/mi.2017.16] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 01/26/2017] [Indexed: 02/04/2023]
Abstract
Cell surface mucin (cs-mucin) glycoproteins are constitutively expressed at the surface of respiratory epithelia where pathogens such as influenza A virus (IAV) gain entry into cells. Different members of the cs-mucin family each express a large and heavily glycosylated extracellular domain that towers above other receptors on the epithelial cell surface, a transmembrane domain that enables shedding of the extracellular domain, and a cytoplasmic tail capable of triggering signaling cascades. We hypothesized that IAV can interact with the terminal sialic acids presented on the extracellular domain of cs-mucins, resulting in modulation of infection efficiency. Utilizing human lung epithelial cells, we found that IAV associates with the cs-mucin MUC1 but not MUC13 or MUC16. Overexpression of MUC1 by epithelial cells or the addition of sialylated synthetic MUC1 constructs, reduced IAV infection in vitro. In addition, Muc1-/- mice infected with IAV exhibited enhanced morbidity and mortality, as well as greater inflammatory mediator responses compared to wild type mice. This study implicates the cs-mucin MUC1 as a critical and dynamic component of the innate host response that limits the severity of influenza and provides the foundation for exploration of MUC1 in resolving inflammatory disease.
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Wu YF, Tsai YF. Assistance of the C-7,8-Picoloyl Moiety for Directing the Glycosyl Acceptors into the α-Orientation for the Glycosylation of Sialyl Donors. Org Lett 2017; 19:4171-4174. [PMID: 28753308 DOI: 10.1021/acs.orglett.7b01658] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient α-sialylation method for many primary hydroxyl acceptors that include 6-OH glycosides has been developed. 7,8-Di-O-picoloyl sialyl glycoside was used as the glycosyl donor, and α-glycoconjugation was controlled by using the 7,8-di-O-picoloyl moiety in CH2Cl2. The methodology was successfully applied to the total synthesis of ganglioside Hp-s1 possessing neuritogenic activity.
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Affiliation(s)
- Yu-Fa Wu
- Department of Chemistry, Chung Yuan Christian University , Chung Li District, Taoyuan 32023, Taiwan
| | - Yow-Fu Tsai
- Department of Chemistry, Chung Yuan Christian University , Chung Li District, Taoyuan 32023, Taiwan
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Chaffey PK, Guan X, Wang LX, Tan Z. Introduction: General Aspects of the Chemical Biology of Glycoproteins. CHEMICAL BIOLOGY OF GLYCOPROTEINS 2017. [DOI: 10.1039/9781782623823-00001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
This chapter is meant to serve as an introduction to the remainder of the book by providing general background on the chemical biology of glycoproteins as well as a brief review of the chapters that follow. The purpose here is to introduce some basic concepts common to many forms of glycosylation for those readers who may be unfamiliar with the field. We begin with a discussion of the strategies and methods used to study protein glycosylation. During the overview, an effort is made to highlight a few relevant aspects of chemical glycobiology, including glycoprotein biosynthesis and a brief description of the synthesis and function of glycoproteins. Finally, we have a summary of the contributions from chemical biology over the years. It is our hope that, after reading this introductory chapter, the reader will have a broad view of the chemical glycobiology field as it currently stands and a deeper appreciation for some of the unique ideas that chemical biology brings to the field.
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Affiliation(s)
- Patrick K. Chaffey
- Department of Chemistry and Biochemistry and BioFrontiers Institute, University of Colorado Boulder CO 80303 USA
| | - Xiaoyang Guan
- Department of Chemistry and Biochemistry and BioFrontiers Institute, University of Colorado Boulder CO 80303 USA
| | - Lai-Xi Wang
- Department of Chemistry and Biochemistry, University of Maryland College Park MD 20742 USA
| | - Zhongping Tan
- Department of Chemistry and Biochemistry and BioFrontiers Institute, University of Colorado Boulder CO 80303 USA
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McDonald DM, Byrne SN, Payne RJ. Synthetic self-adjuvanting glycopeptide cancer vaccines. Front Chem 2015; 3:60. [PMID: 26557640 PMCID: PMC4615963 DOI: 10.3389/fchem.2015.00060] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 10/07/2015] [Indexed: 12/05/2022] Open
Abstract
Due to changes in glycosyltransferase expression during oncogenesis, the glycoproteins of cancer cells often carry highly truncated carbohydrate chains compared to those on healthy cells. These glycans are known as tumor-associated carbohydrate antigens (TACAs), and are prime targets for use in vaccines for the prevention and treatment of cancer. Herein, we review the state-of-the-art in targeting the immune system toward tumor-associated glycopeptide antigens via synthetic self-adjuvanting vaccines, in which the antigenic and adjuvanting moieties of the vaccines are present in the same molecule. The majority of the self-adjuvanting glycopeptide cancer vaccines reported to date employ antigens from mucin 1, a protein which is highly over-expressed and aberrantly glycosylated in many forms of cancer. The adjuvants used in these vaccines predominantly include lipopeptide- or lipoamino acid-based TLR2 agonists, although studies investigating stimulation of TLR9 and TLR4 are also discussed. Many of these adjuvants are highly lipophilic, and, upon conjugation to antigenic peptides, provide amphiphilic vaccine molecules. The amphiphilic nature of these vaccine constructs can lead to the formation of higher-order structures by vaccines in solution, which are likely to be important for their efficacy in vivo.
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Affiliation(s)
- David M. McDonald
- School of Chemistry, The University of SydneySydney, NSW, Australia
- Discipline of Infectious Diseases and Immunology, The University of SydneySydney, NSW, Australia
| | - Scott N. Byrne
- Discipline of Infectious Diseases and Immunology, The University of SydneySydney, NSW, Australia
| | - Richard J. Payne
- School of Chemistry, The University of SydneySydney, NSW, Australia
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Bohé L, Crich D. A propos of glycosyl cations and the mechanism of chemical glycosylation; the current state of the art. Carbohydr Res 2015; 403:48-59. [PMID: 25108484 PMCID: PMC4281519 DOI: 10.1016/j.carres.2014.06.020] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 06/16/2014] [Accepted: 06/19/2014] [Indexed: 12/23/2022]
Abstract
An overview of recent advances in glycosylation with particular emphasis on mechanism is presented. The mounting evidence for both the existence of glycosyl oxocarbenium ions as fleeting intermediates in some reactions, and the crucial role of the associated counterion in others is discussed. The extremes of the SN1 and SN2 manifolds for the glycosylation reaction are bridged by a continuum of mechanisms in which it appears likely that most examples are located.
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Affiliation(s)
- Luis Bohé
- Centre de Recherche de Gif, CNRS, Institut de Chimie des Substances Naturelles, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
| | - David Crich
- Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, MI 48202, USA.
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Kancharla PK, Crich D. Influence of side chain conformation and configuration on glycosyl donor reactivity and selectivity as illustrated by sialic acid donors epimeric at the 7-position. J Am Chem Soc 2013; 135:18999-9007. [PMID: 24261615 PMCID: PMC3917720 DOI: 10.1021/ja410683y] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Two N-acetyl 4O,5N-oxazolidinone-protected sialyl thioglycosides epimeric at the 7-position have been synthesized and their reactivity and stereoselectivity in glycosylation reactions have been compared. It is demonstrated that the natural 7S-donor is both more reactive and more α-selective than the unnatural 7R-isomer. The difference in reactivity is attributed to the side chain conformation and specifically to the proximity of O7 to the anomeric center. In the natural 7S-isomer, O7 is closer to the anomeric center than in its unnatural 7R-epimer and, therefore, better able to support incipient positive charge at the locus of reaction. The difference in selectivity is also attributed to the side conformation, which in the unnatural 7R-series is placed perpendicularly above the α-face of the donor and so shields it to a greater extent than in the 7S-series. These observations are consistent with earlier conclusions on the influence of the side chain conformation on reactivity and selectivity derived from conformationally locked models in the glucose and galactose series and corroborate the suggestion that those effects are predominantly stereoelectronic rather than torsional. The possible relevance of side chain conformation as a factor in the influence of glycosylation stereoselectivity by remote protecting groups and as a control element in enzymic processes for glycosidic bond formation and hydrolysis are discussed. Methods for assignment of the anomeric configuration in the sialic acid glycosides are critically surveyed.
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Affiliation(s)
- Pavan K Kancharla
- Department of Chemistry, Wayne State University , 5101 Cass Avenue, Detroit, Michigan 48202, United States
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