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Dam TK, Hohman O, Sheppard L, Brewer CF, Bandyopadhyay P. Mechanism of multivalent glycoconjugate-lectin interaction: An update. Adv Carbohydr Chem Biochem 2023; 84:1-21. [PMID: 37979977 DOI: 10.1016/bs.accb.2023.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2023]
Abstract
Lectins are predominantly oligomeric proteins with several binding sites per molecule. Glycoconjugates are their natural ligands, which often possess multiple binding epitopes. Thus, lectin-glycoconjugate interactions are mostly multivalent in nature. The mechanism of multivalent binding is fundamentally different from those described for monovalent interactions in textbooks and research papers. Over the years, binding studies that make use of different lectins and a variety of multivalent glycoconjugate ligands were conducted in order to understand the underlying principles of multivalency. Starting with seemingly simple synthetic multivalent analogs, systematic studies were carried out using natural glycoconjugate ligands with increasing valency and complexity. Those ligands included multivalent glycoproteins, polyvalent polysaccharides, including glycosaminoglycans, as well as supra-valent mucins and proteoglycans. Models and mechanisms of multivalent binding derived from quantitative data are summarized in the present updated review.
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Affiliation(s)
- Tarun K Dam
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, MI, United States; Health Research Institute, Michigan Technological University, Houghton, MI, United States.
| | - Olivia Hohman
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, MI, United States
| | - Lucas Sheppard
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, MI, United States
| | - C Fred Brewer
- Department of Molecular Pharmacology, Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY, United States
| | - Purnima Bandyopadhyay
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, MI, United States
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2
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Hoyos P, Perona A, Juanes O, Rumbero Á, Hernáiz MJ. Synthesis of Glycodendrimers with Antiviral and Antibacterial Activity. Chemistry 2021; 27:7593-7624. [PMID: 33533096 DOI: 10.1002/chem.202005065] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Indexed: 12/27/2022]
Abstract
Glycodendrimers are an important class of synthetic macromolecules that can be used to mimic many structural and functional features of cell-surface glycoconjugates. Their carbohydrate moieties perform key important functions in bacterial and viral infections, often regulated by carbohydrate-protein interactions. Several studies have shown that the molecular structure, valency and spatial organisation of carbohydrate epitopes in glycoconjugates are key factors in the specificity and avidity of carbohydrate-protein interactions. Choosing the right glycodendrimers almost always helps to interfere with such interactions and blocks bacterial or viral adhesion and entry into host cells as an effective strategy to inhibit bacterial or viral infections. Herein, the state of the art in the design and synthesis of glycodendrimers employed for the development of anti-adhesion therapy against bacterial and viral infections is described.
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Affiliation(s)
- Pilar Hoyos
- Chemistry in Pharmaceutical Sciences Department, Complutense University of Madrid, Plaza Ramón y Cajal s/n, 28040, Madrid, Spain
| | - Almudena Perona
- Chemistry in Pharmaceutical Sciences Department, Complutense University of Madrid, Plaza Ramón y Cajal s/n, 28040, Madrid, Spain
| | - Olga Juanes
- Organic Chemistry Department, Autónoma University of Madrid, Francisco Tomás y Valiente 7, 28049, Madrid, Spain
| | - Ángel Rumbero
- Organic Chemistry Department, Autónoma University of Madrid, Francisco Tomás y Valiente 7, 28049, Madrid, Spain
| | - María J Hernáiz
- Chemistry in Pharmaceutical Sciences Department, Complutense University of Madrid, Plaza Ramón y Cajal s/n, 28040, Madrid, Spain
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3
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FitzGerald FG, Rodriguez Benavente MC, Garcia C, Rivero Y, Singh Y, Wang H, Fields GB, Cudic M. TF-containing MUC1 glycopeptides fail to entice Galectin-1 recognition of tumor-associated Thomsen-Freidenreich (TF) antigen (CD176) in solution. Glycoconj J 2020; 37:657-666. [PMID: 33001366 DOI: 10.1007/s10719-020-09951-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 08/28/2020] [Accepted: 09/25/2020] [Indexed: 12/31/2022]
Abstract
Aberrant Mucin-1 (MUC1) glycosylation with the Thomsen-Friedenreich (TF) tumor-associated antigen (CD176) is a hallmark of epithelial carcinoma progression and poor patient prognosis. Recognition of TF by glycan-binding proteins, such as galectins, enables the pathological repercussions of this glycan presentation, yet the underlying binding specificities of different members of the galectin family is a matter of continual investigation. While Galectin-3 (Gal-3) recognition of TF has been well-documented at both the cellular and molecular level, Galectin-1 (Gal-1) recognition of TF has only truly been alluded to in cell-based platforms. Immunohistochemical analyses have purported Gal-1 binding to TF on MUC1 at the cell surface, however binding at the molecular level was inconclusive. We hypothesize that glycan scaffold (MUC1's tandem repeat peptide sequence) and/or multivalency play a role in the binding recognition of TF antigen by Gal-1. In this study we have developed a method for large-scale expression of Gal-1 and its histidine-tagged analog for use in binding studies by isothermal titration calorimetry (ITC) and development of an analytical method based on AlphaScreen technology to screen for Gal-1 inhibitors. Surprisingly, neither glycan scaffold or multivalent presentation of TF antigen on the scaffold was able to entice Gal-1 recognition to the level of affinity expected for functional significance. Future evaluations of the Gal-1/TF binding interaction in order to draw connections between immunohistochemical data and analytical measurements are warranted.
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Affiliation(s)
- Forrest G FitzGerald
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA.,Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Maria C Rodriguez Benavente
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA.,Department of Biochemistry and Molecular Biology, Complex Carbohydrate Research Center, University of Georgia, 120 E Green St, Athens, GA, 30602, USA
| | - Camelia Garcia
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA
| | - Yaima Rivero
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA
| | - YashoNandini Singh
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA
| | - Hongjie Wang
- Department of Chemistry and Biochemistry, Florida Atlantic University, Jupiter, FL, USA
| | - Gregg B Fields
- Department of Chemistry and Biochemistry, Florida Atlantic University, Jupiter, FL, USA.,Department of Chemistry, The Scripps Research Institute/Scripps Florida, Jupiter, FL, USA
| | - Maré Cudic
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA.
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4
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Welch CJ, Talaga ML, Kadav PD, Edwards JL, Bandyopadhyay P, Dam TK. A capture and release method based on noncovalent ligand cross-linking and facile filtration for purification of lectins and glycoproteins. J Biol Chem 2020; 295:223-236. [PMID: 31792056 PMCID: PMC6952606 DOI: 10.1074/jbc.ra119.010625] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 11/22/2019] [Indexed: 12/26/2022] Open
Abstract
Glycan-binding proteins such as lectins are ubiquitous proteins that mediate many biological functions. To study their various biological activities and structure-function relationships, researchers must use lectins in their purest form. Conventional purification techniques, especially affinity column chromatography, have been instrumental in isolating numerous lectins and glycoproteins. These approaches, however, are time-consuming, consist of multiple steps, and often require extensive trial-and-error experimentation. Therefore, techniques that are relatively rapid and facile are needed. Here we describe such a technique, called capture and release (CaRe). The strength of this approach is rooted in its simplicity and accuracy. CaRe purifies lectins by utilizing their ability to form spontaneous noncovalently cross-linked complexes with specific multivalent ligands. The lectins are captured in the solution phase by multivalent capturing agents, released by competitive monovalent ligands, and then separated by filtration. CaRe does not require antibodies, solid affinity matrices, specialized detectors, a customized apparatus, controlled environments, or functionalization or covalent modification of reagents. CaRe is a time-saving procedure that can purify lectins even from a few milliliters of crude protein extracts. We validated CaRe by purifying recombinant human galectin-3 and five other known lectins and also tested CaRe's ability to purify glycoproteins. Besides purifying lectins and glycoproteins, CaRe has the potential to purify other glycoconjugates, including proteoglycans. This technique could also be used for nonlectin proteins that bind multivalent ligands. Given the ubiquity of glycosylation in nature, we anticipate that CaRe has broad utility.
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Affiliation(s)
- Christina J Welch
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan 49931
| | - Melanie L Talaga
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan 49931
| | - Priyanka D Kadav
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan 49931
| | - Jared L Edwards
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan 49931
| | - Purnima Bandyopadhyay
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan 49931
| | - Tarun K Dam
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan 49931; Health Research Institute, Michigan Technological University, Houghton, Michigan 49931.
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5
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Ehrmann S, Chu CW, Kumari S, Silberreis K, Böttcher C, Dernedde J, Ravoo BJ, Haag R. A toolbox approach for multivalent presentation of ligand-receptor recognition on a supramolecular scaffold. J Mater Chem B 2018; 6:4216-4222. [PMID: 32254595 DOI: 10.1039/c8tb00922h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A supramolecular toolbox approach for multivalent ligand-receptor recognition was established based on β-cyclodextrin vesicles (CDVs). A series of bifunctional ligands for CDVs was synthesised. These ligands comprise on one side adamantane, enabling the functionalisation of CDVs with these ligands, and either mannose or sulphate group moieties on the other side for biological receptor recognition. The physicochemical properties of the host-guest complexes formed by β-cyclodextrin (β-CD) and adamantane were determined by isothermal titration calorimetry (ITC). Ligand-lectin interactions were investigated by surface plasmon resonance experiments (SPR) for the mannose ligands and the lectin Concanavalin A (ConA). Microscale thermophoresis (MST) measurements were applied for sulphate-dependent binding to L-selectin. In both cases, a multivalent affinity enhancement became apparent when the ligands were presented on the CDV scaffold. Furthermore, not only the clustering between our supramolecular mannosylated complex and Escherichia coli (E. coli), expressing the lectin FimH, was visualised by cryo-TEM, but also the competitive character to detach bound E. coli from a cell line, representing the uroepithelial cell surface, was demonstrated. In summary, a facile and effective supramolecular toolbox was established for various ligand-receptor recognition applications.
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Affiliation(s)
- Svenja Ehrmann
- Institute for Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany.
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Restuccia A, Hudalla GA. Tuning carbohydrate density enhances protein binding and inhibition by glycosylated β-sheet peptide nanofibers. Biomater Sci 2018; 6:2327-2335. [DOI: 10.1039/c8bm00533h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The efficacy of glycosylated β-sheet peptide nanofibers for inhibiting carbohydrate-binding proteins can be increased by tuning carbohydrate density to maximize protein binding affinity.
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Affiliation(s)
- Antonietta Restuccia
- J. Crayton Pruitt Family Department of Biomedical Engineering
- University of Florida
- Gainesville
- USA 32611
| | - Gregory A. Hudalla
- J. Crayton Pruitt Family Department of Biomedical Engineering
- University of Florida
- Gainesville
- USA 32611
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Lusvarghi S, Ghirlando R, Davison JR, Bewley CA. Chemical and Biophysical Approaches for Complete Characterization of Lectin-Carbohydrate Interactions. Methods Enzymol 2017; 598:3-35. [PMID: 29306440 PMCID: PMC6141027 DOI: 10.1016/bs.mie.2017.06.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Lectins are carbohydrate-binding proteins unrelated to antibodies or enzymes. While carbohydrates are present on all cells and pathogens, lectins are also ubiquitous in nature and their interactions with glycans mediate countless biological and physical interactions. Due to the multivalency found in both lectins and their glycan-binding partners, complete characterization of these interactions can be complex and typically requires the use of multiple complimentary techniques. In this chapter, we provide a general strategy and protocols for chemical and biophysical approaches that can be used to characterize carbohydrate-mediated interactions in the context of individual oligosaccharides, as part of a glycoprotein, and ending with visualization of interactions with whole virions.
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Affiliation(s)
- Sabrina Lusvarghi
- Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Rodolfo Ghirlando
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Jack R Davison
- Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Carole A Bewley
- Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, United States.
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8
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Hadjialirezaei S, Picco G, Beatson R, Burchell J, Stokke BT, Sletmoen M. Interactions between the breast cancer-associated MUC1 mucins and C-type lectin characterized by optical tweezers. PLoS One 2017; 12:e0175323. [PMID: 28414807 PMCID: PMC5393574 DOI: 10.1371/journal.pone.0175323] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 03/23/2017] [Indexed: 02/03/2023] Open
Abstract
Carbohydrate–protein interactions govern many crucial processes in biological systems including cell recognition events. We have used the sensitive force probe optical tweezers to quantify the interactions occurring between MGL lectins and MUC1 carrying the cancer-associated glycan antigens mucins Tn and STn. Unbinding forces of 7.6±1.1 pN and 7.1±1.1 pN were determined for the MUC1(Tn)—MGL and MUC1(STn)—MGL interactions, at a force loading rate of ~40 pN/s. The interaction strength increased with increasing force loading rate, to 27.1±4.4 and 36.9±3.6 pN at a force loading rate of ~ 310 pN/s. No interactions were detected between MGL and MUC1(ST), a glycoform of MUC1 also expressed by breast carcinoma cells. Interestingly, this glycan (ST) can be found on proteins expressed by normal cells, although in this case not on MUC1. Additionally, GalNAc decorated polyethylene glycol displayed similar rupture forces as observed for MUC1(Tn) and MUC1(STn) when forced to unbind from MGL, indicating that GalNAc is an essential group in these interactions. Since the STn glycan decoration is more frequently found on the surface of carcinomas than the Tn glycan, the binding of MUC1 carrying STn to MGL may be more physiologically relevant and may be in part responsible for some of the characteristics of STn expressing tumours.
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Affiliation(s)
- Soosan Hadjialirezaei
- Biophysics and Medical Technology, Department of Physics, NTNU Norwegian University of Science and Technology, Trondheim, Norway
| | - Gianfranco Picco
- Breast Cancer Biology, King’s College London, Guy’s Hospital, London, United Kingdom
| | - Richard Beatson
- Breast Cancer Biology, King’s College London, Guy’s Hospital, London, United Kingdom
| | - Joy Burchell
- Breast Cancer Biology, King’s College London, Guy’s Hospital, London, United Kingdom
| | - Bjørn Torger Stokke
- Biophysics and Medical Technology, Department of Physics, NTNU Norwegian University of Science and Technology, Trondheim, Norway
| | - Marit Sletmoen
- Department of Biotechnology, NTNU Norwegian University of Science and Technology, Trondheim, Norway
- * E-mail:
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9
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Talaga ML, Fan N, Fueri AL, Brown RK, Bandyopadhyay P, Dam TK. Multitasking Human Lectin Galectin-3 Interacts with Sulfated Glycosaminoglycans and Chondroitin Sulfate Proteoglycans. Biochemistry 2016; 55:4541-51. [PMID: 27427828 DOI: 10.1021/acs.biochem.6b00504] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Glycosaminoglycan (GAG) binding proteins (GAGBPs), including growth factors, cytokines, morphogens, and extracellular matrix proteins, interact with both free GAGs and those covalently linked to proteoglycans. Such interactions modulate a variety of cellular and extracellular events, such as cell growth, metastasis, morphogenesis, neural development, and inflammation. GAGBPs are structurally and evolutionarily unrelated proteins that typically recognize internal sequences of sulfated GAGs. GAGBPs are distinct from the other major group of glycan binding proteins, lectins. The multifunctional human galectin-3 (Gal-3) is a β-galactoside binding lectin that preferentially binds to N-acetyllactosamine moieties on glycoconjugates. Here, we demonstrate through microcalorimetric and spectroscopic data that Gal-3 possesses the characteristics of a GAGBP. Gal-3 interacts with unmodified heparin, chondroitin sulfate-A (CSA), -B (CSB), and -C (CSC) as well as chondroitin sulfate proteoglycans (CSPGs). While heparin, CSA, and CSC bind with micromolar affinity, the affinity of CSPGs is nanomolar. Significantly, CSA, CSC, and a bovine CSPG were engaged in multivalent binding with Gal-3 and formed noncovalent cross-linked complexes with the lectin. Binding of sulfated GAGs was completely abolished when Gal-3 was preincubated with β-lactose. Cross-linking of Gal-3 by CSA, CSC, and the bovine CSPG was reversed by β-lactose. Both observations strongly suggest that GAGs primarily occupy the lactose/LacNAc binding site of Gal-3. Hill plot analysis of calorimetric data reveals that the binding of CSA, CSC, and a bovine CSPG to Gal-3 is associated with progressive negative cooperativity effects. Identification of Gal-3 as a GAGBP should help to reveal new functions of Gal-3 mediated by GAGs and proteoglycans.
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Affiliation(s)
- Melanie L Talaga
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, ‡Department of Biological Sciences, §Life Science and Technology Institute, Michigan Technological University , Houghton, Michigan 49931, United States
| | - Ni Fan
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, ‡Department of Biological Sciences, §Life Science and Technology Institute, Michigan Technological University , Houghton, Michigan 49931, United States
| | - Ashli L Fueri
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, ‡Department of Biological Sciences, §Life Science and Technology Institute, Michigan Technological University , Houghton, Michigan 49931, United States
| | - Robert K Brown
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, ‡Department of Biological Sciences, §Life Science and Technology Institute, Michigan Technological University , Houghton, Michigan 49931, United States
| | - Purnima Bandyopadhyay
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, ‡Department of Biological Sciences, §Life Science and Technology Institute, Michigan Technological University , Houghton, Michigan 49931, United States
| | - Tarun K Dam
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, ‡Department of Biological Sciences, §Life Science and Technology Institute, Michigan Technological University , Houghton, Michigan 49931, United States
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Huang ML, Godula K. Nanoscale materials for probing the biological functions of the glycocalyx. Glycobiology 2016; 26:797-803. [PMID: 26916883 PMCID: PMC5018045 DOI: 10.1093/glycob/cww022] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 01/31/2016] [Accepted: 02/16/2016] [Indexed: 12/23/2022] Open
Abstract
Glycans are among the most intriguing carriers of biological information in living systems. The structures of glycans not only convey the cells' physiological state, but also regulate cellular communication and responses by engaging receptors on neighboring cells and in the extracellular matrix. The assembly of simple monosaccharide building blocks into linear or branched oligo- and polysaccharides gives rise to a large repertoire of diverse glycan structures. Despite their structural complexity, individual glycans rarely engage their protein partners with high affinity. Yet, glycans modulate biological processes with exquisite selectivity and specificity. To correctly evaluate glycan interactions and their biological consequences, one needs to look beyond individual glycan structures and consider the entirety of the cell-surface landscape. There, glycans are presented on protein scaffolds, or are linked directly to membrane lipids, forming a complex, hierarchically organized network with specialized functions, called the glycocalyx. Nanoscale glycomaterials, which can mimic the various components of the glycocalyx, have been instrumental in revealing how the presentation of glycans can influence their biological functions. In this review, we wish to highlight some recent developments in this area, while placing emphasis on the applications of glycomaterials providing new insights into the mechanisms through which glycans mediate cellular functions.
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Affiliation(s)
- Mia L Huang
- Department of Chemistry and Biochemistry, University of California, San Diego, CA 92093-0358, USA
| | - Kamil Godula
- Department of Chemistry and Biochemistry, University of California, San Diego, CA 92093-0358, USA
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Fan N, Talaga ML, Brown RK, Fueri AL, Bandyopadhyay P, Dam TK. Glycan-Dependent Mutual and Reversible Sequestration of Two Thyroid Cancer Biomarkers. Thyroid 2015; 25:1339-46. [PMID: 26421933 DOI: 10.1089/thy.2015.0105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Thyroglobulin (Tg), the major thyroidal protein, plays important roles in thyroid hormone biosynthesis and in autoimmune thyroid diseases (AITD). Tg also serves as a pre- and postoperative biomarker of differentiated thyroid cancer (DTC). The endogenous β-galactoside binding lectin galectin-3 (Gal-3), secreted by transformed thyroid cells, has been shown to be another useful biomarker of DTC. Tg contains covalently linked complex-type glycans that can serve as binding epitopes of Gal-3. The objective of the study is to investigate the interaction between Tg and Gal-3 and discuss its potential consequences. METHODS Binding interaction between Tg and Gal-3 was first studied by hemagglutination inhibition assays. Subsequently, a detailed analysis of binding thermodynamics was carried out by isothermal titration calorimetry. Quantitative precipitation was performed to study the complex formation between Tg and Gal-3 and to determine the binding stoichiometry. The concentration-dependent rate and amount of complex formation between Tg and Gal-3 was examined spectrophotometrically. A similar approach was taken to study the effect of free Tg and Gal-3 on preformed Tg-Gal-3 complex. RESULTS Quantitative biochemical and biophysical data show that these two biomarkers produced by thyroid cancer cells interact with each other with submicromolar affinity and form an insoluble complex at their stoichiometric concentration. One Tg molecule could bind up to 14 molecules of Gal-3. Such complex formation mutually sequestered both Tg and Gal-3, decreasing the concentration of their freely available forms. Formation of the Tg-Gal-3 complex was reversible as the preformed complex was dissolved by free Tg as well as free Gal-3. While free Tg rapidly dissolved preformed Tg-Gal-3 complex in a concentration-dependent manner, Gal-3 was found to be much less efficient and slowly dissolved only a fraction of the preformed complex at a relatively higher Gal-3 concentration. CONCLUSIONS Complex formation between Tg and Gal-3 through high affinity binding and the sensitivity of the complex to free Tg and Gal-3 can potentially influence their biological functions. Interactions between Tg and Gal-3 might also interfere with their clinical detection, the same way Tg autoantibody (TgAb) is reported to interfere with Tg assays. The data support a model of Gal-3-mediated homeostatic process of Tg.
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Affiliation(s)
- Ni Fan
- 1 Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University , Houghton, Michigan
| | - Melanie L Talaga
- 1 Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University , Houghton, Michigan
| | - Robert K Brown
- 1 Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University , Houghton, Michigan
| | - Ashli L Fueri
- 1 Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University , Houghton, Michigan
| | - Purnima Bandyopadhyay
- 2 Department of Biological Sciences, Michigan Technological University , Houghton, Michigan
| | - Tarun K Dam
- 1 Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University , Houghton, Michigan
- 3 Biotechnology Research Center, Michigan Technological University , Houghton, Michigan
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12
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Dam TK, Talaga ML, Fan N, Brewer CF. Measuring Multivalent Binding Interactions by Isothermal Titration Calorimetry. Methods Enzymol 2015; 567:71-95. [PMID: 26794351 DOI: 10.1016/bs.mie.2015.08.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Multivalent glycoconjugate-protein interactions are central to many important biological processes. Isothermal titration calorimetry (ITC) can potentially reveal the molecular and thermodynamic basis of such interactions. However, calorimetric investigation of multivalency is challenging. Binding of multivalent glycoconjugates to proteins (lectins) often leads to a stoichiometry-dependent precipitation process due to noncovalent cross-linking between the reactants. Precipitation during ITC titration severely affects the quality of the baseline as well as the signals. Hence, the resulting thermodynamic data are not dependable. We have made some modifications to address this problem and successfully studied multivalent glycoconjugate binding to lectins. We have also modified the Hill plot equation to analyze high quality ITC raw data obtained from multivalent binding. As described in this chapter, ITC-driven thermodynamic parameters and Hill plot analysis of ITC raw data can provide valuable information about the molecular mechanism of multivalent lectin-glycoconjugate interactions. The methods described herein revealed (i) the importance of functional valence of multivalent glycoconjugates, (ii) that favorable entropic effects contribute to the enhanced affinities associated with multivalent binding, (iii) that with the progression of lectin binding, the microscopic affinities of the glycan epitopes of a multivalent glycoconjugate decrease (negative cooperativity), (iv) that lectin binding to multivalent glycoconjugates, especially to mucins, involves internal diffusion jumps, (bind and jump) and (v) that scaffolds of glycoconjugates influence their entropy of binding.
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Affiliation(s)
- Tarun K Dam
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan, USA; Biotechnology Research Center, Michigan Technological University, Houghton, Michigan, USA.
| | - Melanie L Talaga
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan, USA
| | - Ni Fan
- Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan, USA
| | - Curtis F Brewer
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York, USA.
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13
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Abbassi L, Chabre YM, Kottari N, Arnold AA, André S, Josserand J, Gabius HJ, Roy R. Multifaceted glycodendrimers with programmable bioactivity through convergent, divergent, and accelerated approaches using polyfunctional cyclotriphosphazenes. Polym Chem 2015. [DOI: 10.1039/c5py01283j] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The cyclotriphosphazene-based platform facilitates versatile synthesis of glycodendrimers active as inhibitors of two biomedically relevant lectins.
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Affiliation(s)
- Leïla Abbassi
- Pharmaqam
- Department of Chemistry
- University du Québec à Montréal
- Montréal
- Canada
| | - Yoann M. Chabre
- Pharmaqam
- Department of Chemistry
- University du Québec à Montréal
- Montréal
- Canada
| | - Naresh Kottari
- Pharmaqam
- Department of Chemistry
- University du Québec à Montréal
- Montréal
- Canada
| | - Alexandre A. Arnold
- Pharmaqam
- Department of Chemistry
- University du Québec à Montréal
- Montréal
- Canada
| | - Sabine André
- Institute of Physiological Chemistry
- Faculty of Veterinary Medicine
- Ludwig-Maximilians-University
- 80539 Munich
- Germany
| | - Johan Josserand
- Pharmaqam
- Department of Chemistry
- University du Québec à Montréal
- Montréal
- Canada
| | - Hans-Joachim Gabius
- Institute of Physiological Chemistry
- Faculty of Veterinary Medicine
- Ludwig-Maximilians-University
- 80539 Munich
- Germany
| | - René Roy
- Pharmaqam
- Department of Chemistry
- University du Québec à Montréal
- Montréal
- Canada
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14
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Sharma R, Kottari N, Chabre YM, Abbassi L, Shiao TC, Roy R. A highly versatile convergent/divergent “onion peel” synthetic strategy toward potent multivalent glycodendrimers. Chem Commun (Camb) 2014; 50:13300-3. [DOI: 10.1039/c4cc06191h] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Both convergent and divergent strategies for the synthesis of “onion peel” glycodendrimers are reported which resulted in one of the best multivalent ligands known against the virulent factor from a bacterial lectin isolated from Pseudomonas aeruginosa.
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Affiliation(s)
- Rishi Sharma
- Pharmaqam
- Department of Chemistry
- University of Quebec a Montreal
- Montreal, Canada H3C 3P8
| | - Naresh Kottari
- Pharmaqam
- Department of Chemistry
- University of Quebec a Montreal
- Montreal, Canada H3C 3P8
| | - Yoann M. Chabre
- Pharmaqam
- Department of Chemistry
- University of Quebec a Montreal
- Montreal, Canada H3C 3P8
| | - Leïla Abbassi
- Pharmaqam
- Department of Chemistry
- University of Quebec a Montreal
- Montreal, Canada H3C 3P8
| | - Tze Chieh Shiao
- Pharmaqam
- Department of Chemistry
- University of Quebec a Montreal
- Montreal, Canada H3C 3P8
| | - René Roy
- Pharmaqam
- Department of Chemistry
- University of Quebec a Montreal
- Montreal, Canada H3C 3P8
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