1
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Kataki-Anastasakou A, Jia S, Axtell JC, Sletten EM. A Fluorescent Unnatural Mannosamine Derivative with Enhanced Emission Upon Complexation with Cucurbit[7]uril. Isr J Chem 2023; 63:e202200069. [PMID: 37636996 PMCID: PMC10457038 DOI: 10.1002/ijch.202200069] [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: 09/10/2022] [Indexed: 12/28/2022]
Abstract
Metabolic incorporation of unnatural functionality on glycans has allowed chemical biologists to observe and affect cellular processes. Recent work has resulted in glycan-fluorophore structures that allow for direct visualization of glycan-mediated processes, shining light on their role in living systems. This work describes the serendipitous discovery of a small chemical reporter-fluorophore. Investigations into the mechanism of fluorescence arising from (trimethylsilyl)methylglycine appended on mannosamine suggest rigidity and restriction of lone pair geometry contribute to the fluorescent behaviour. In fact, in situ cyclization and encapsulation in cucurbit[7]uril enhance fluorescence to levels that can be observed in live cells. While the reported unnatural mannosamine does not traverse the sialic acid biosynthetic pathway, this discovery may lead to small, "turn-on" chemical reporters for incorporation in living systems.
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Affiliation(s)
- Anna Kataki-Anastasakou
- Department of Chemistry and Biochemistry, University of California Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, USA
| | - Shang Jia
- Department of Chemistry and Biochemistry, University of California Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, USA
| | - Jonathan C Axtell
- Department of Chemistry and Biochemistry, University of California Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, USA
| | - Ellen M Sletten
- Department of Chemistry and Biochemistry, University of California Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, USA
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2
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QIN CJ, DING MR, TIAN GZ, ZOU XP, FU JJ, HU J, YIN J. Chemical approaches towards installation of rare functional groups in bacterial surface glycans. Chin J Nat Med 2022; 20:401-420. [DOI: 10.1016/s1875-5364(22)60177-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Indexed: 11/24/2022]
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3
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Bourguet E, Figurska S, Fra Czek MM. Human Neuraminidases: Structures and Stereoselective Inhibitors. J Med Chem 2022; 65:3002-3025. [PMID: 35170942 DOI: 10.1021/acs.jmedchem.1c01612] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
This Perspective describes the classification, structures, substrates, mechanisms of action, and implications of human neuraminidases (hNEUs) in various pathologies. Some inhibitors have been developed for each isoform, leading to more precise interactions with hNEUs. Although crystal structure data are available for NEU2, most of the findings are based on NEU1 inhibition, and limited information is available for other hNEUs. Therefore, the synthesis of new compounds would facilitate the enrichment of the arsenal of inhibitors to better understand the roles of hNEUs and their mechanisms of action. Nevertheless, due to the already known inhibitors of human neuraminidase enzymes, a structure-activity relationship is presented along with different approaches to inhibit these enzymes for the development of potent and selective inhibitors. Among the different emerging strategies, one is the inhibition of the dimerization of NEU1 or NEU3, and the second is the inhibition of certain receptors located close to hNEU.
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Affiliation(s)
- Erika Bourguet
- Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims (ICMR), CNRS UMR 7312, 51097 Reims, France
| | - Sylwia Figurska
- Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims (ICMR), CNRS UMR 7312, 51097 Reims, France.,Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland
| | - Manuela Maria Fra Czek
- Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims (ICMR), CNRS UMR 7312, 51097 Reims, France.,Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland
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4
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Hassan AA, Oscarson S. Facile anomer-oriented syntheses of 4-methylumbelliferyl sialic acid glycosides. Org Biomol Chem 2021; 19:6644-6649. [PMID: 34263283 DOI: 10.1039/d1ob00877c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As part of a program to find new sialidases and determine their enzymatic specificity and catalytic activity, a library of 4-methylumbelliferyl sialic acid glycosides derivatised at the C-5 position were prepared from N-acetylneuraminic acid. Both α- and β-4-methylumbelliferyl sialic acid glycosides were prepared in high yields and stereoselectivity. α-Anomers were accessed via reagent control by utilising additive CH3CN and TBAI, whereas the β-anomers were synthesised through a diastereoselective addition reaction of iodine and the aglycone to the corresponding glycal followed by reduction of the resulting 3-iodo compounds. Both anomer-oriented synthetic pathways allow for gram-scale stereoselective syntheses of the desired C-5 modified neuraminic acid derivatives for use as tools to quantify the enzymatic activity and substrate specificity of known sialidases, and potential detection and investigation of novel sialidases.
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Affiliation(s)
- Abdullah A Hassan
- Centre for Synthesis and Chemical Biology, University College Dublin, Belfield, Dublin, Ireland.
| | - Stefan Oscarson
- Centre for Synthesis and Chemical Biology, University College Dublin, Belfield, Dublin, Ireland.
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5
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Yuan L, Zhao Y, Sun XL. Sialidase substrates for Sialdiase assays - activity, specificity, quantification and inhibition. Glycoconj J 2020; 37:513-531. [PMID: 32813176 DOI: 10.1007/s10719-020-09940-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 07/08/2020] [Accepted: 08/06/2020] [Indexed: 12/01/2022]
Abstract
Sialidases are glycosidases responsible for the removal of sialic acid (Sia) residues (desialylation) from glycan portions of either glycoproteins or glycolipids. By desialylation, sialidases are able to modulate the functionality and stability of the Sia-containing molecules and are involved in both physiological and pathological pathways. Therefore, evaluation of sialidase activity and specificity is important for understanding the biological significance of desialylation by sialidases and its function and the related molecular mechanisms of the physiological and pathological pathways. In addition, it is essential for developing novel mechanisms and approaches for disease treatment and diagnosis and pathogen detection as well. This review summarizes the most recent sialidase substrates for evaluating sialidase activity and specificity and screening sialidase inhibitors, including (i) general sialidase substrates, (ii) specific sialidase substrates, (iii) native sialidase substrates and (iv) cellular sialidase substrates. This review also provides a brief introduction of recent instrumental methods for quantifying the sialidase activity, such as UV, fluorescence, HPLC and LC-MS methods.
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Affiliation(s)
- Lei Yuan
- Department of Chemistry, Chemical and Biomedical Engineering and Center for Gene Regulation in Health and Disease (GRHD), Cleveland State University, 2121 Euclid Avenue, Cleveland, OH, 44115, USA.,School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, 110016, People's Republic of China
| | - Yu Zhao
- Department of Chemistry, Chemical and Biomedical Engineering and Center for Gene Regulation in Health and Disease (GRHD), Cleveland State University, 2121 Euclid Avenue, Cleveland, OH, 44115, USA
| | - Xue-Long Sun
- Department of Chemistry, Chemical and Biomedical Engineering and Center for Gene Regulation in Health and Disease (GRHD), Cleveland State University, 2121 Euclid Avenue, Cleveland, OH, 44115, USA.
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6
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Broszeit F, Tzarum N, Zhu X, Nemanichvili N, Eggink D, Leenders T, Li Z, Liu L, Wolfert MA, Papanikolaou A, Martínez-Romero C, Gagarinov IA, Yu W, García-Sastre A, Wennekes T, Okamatsu M, Verheije MH, Wilson IA, Boons GJ, de Vries RP. N-Glycolylneuraminic Acid as a Receptor for Influenza A Viruses. Cell Rep 2020; 27:3284-3294.e6. [PMID: 31189111 PMCID: PMC6750725 DOI: 10.1016/j.celrep.2019.05.048] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 03/05/2019] [Accepted: 05/15/2019] [Indexed: 12/05/2022] Open
Abstract
A species barrier for the influenza A virus is the differential expression of sialic acid, which can either be α2,3-linked for avians or α2,6-linked for human viruses. The influenza A virus hosts also express other species-specific sialic acid derivatives. One major modification at C-5 is N-glycolyl (NeuGc), instead of N-acetyl (NeuAc). N-glycolyl is mammalian specific and expressed in pigs and horses, but not in humans, ferrets, seals, or dogs. Hemagglutinin (HA) adaptation to either N-acetyl or N-glycolyl is analyzed on a sialoside microarray containing both α2,3- and α2,6-linkage modifications on biologically relevant N-glycans. Binding studies reveal that avian, human, and equine HAs bind either N-glycolyl or N-acetyl. Structural data on N-glycolyl binding HA proteins of both H5 and H7 origin describe this specificity. Neuraminidases can cleave N-glycolyl efficiently, and tissue-binding studies reveal strict species specificity. The exclusive manner in which influenza A viruses differentiate between N-glycolyl and N-acetyl is indicative of selection. Broszeit and colleagues demonstrate that influenza A viruses recognize either N-acetyl or N-glycolyl neuraminic acid, and they explain these specificities using X-ray structures. NeuGc-binding viruses are perfectly viable, and neuraminidases can cleave NeuGc-containing receptor structures. There is an apparent selection now for NeuAc, as no known NeuGc-binding virus currently circulates.
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Affiliation(s)
- Frederik Broszeit
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, the Netherlands
| | - Netanel Tzarum
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Xueyong Zhu
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Nikoloz Nemanichvili
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, 3584 CL Utrecht, the Netherlands
| | - Dirk Eggink
- Department of Experimental Virology, Amsterdam Medical Centre, Amsterdam, the Netherlands
| | - Tim Leenders
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, the Netherlands
| | - Zeshi Li
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, the Netherlands
| | - Lin Liu
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA
| | - Margreet A Wolfert
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, the Netherlands; Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA
| | - Andreas Papanikolaou
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, 3584 CL Utrecht, the Netherlands
| | - Carles Martínez-Romero
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Ivan A Gagarinov
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, the Netherlands
| | - Wenli Yu
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Adolfo García-Sastre
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Department of Medicine, Division of Infectious Diseases, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Tom Wennekes
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, the Netherlands
| | - Masatoshi Okamatsu
- Laboratory of Microbiology, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - Monique H Verheije
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, 3584 CL Utrecht, the Netherlands
| | - Ian A Wilson
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA; Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Geert-Jan Boons
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, the Netherlands; Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA
| | - Robert P de Vries
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, the Netherlands.
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7
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Bloemendal VRLJ, Moons SJ, Heming JJA, Chayoua M, Niesink O, van Hest JCM, Boltje TJ, Rutjes FPJT. Chemoenzymatic Synthesis of Sialic Acid Derivatives Using Immobilized N-Acetylneuraminate Lyase in a Continuous Flow Reactor. Adv Synth Catal 2019; 361:2443-2447. [PMID: 31598119 PMCID: PMC6774325 DOI: 10.1002/adsc.201900146] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 04/01/2019] [Indexed: 12/12/2022]
Abstract
The synthesis of N-acetylneuraminic acid (Neu5Ac) derivatives is drawing more and more attention in glycobiology research because of the important role of sialic acids in e. g. cancer, bacterial, and healthy cells. Chemical preparation of these carbohydrates typically relies on multistep synthetic procedures leading to low overall yields. Herein we report a continuous flow process involving N-acetylneuraminate lyase (NAL) immobilized on Immobead 150P (Immobead-NAL) to prepare Neu5Ac derivatives. Batch experiments with Immobead-NAL showed equal activity as the native enzyme. Moreover, by using a fivefold excess of either N-acetyl-D-mannosamine (ManNAc) or pyruvate the conversion and isolated yield of Neu5Ac were significantly improved. To further increase the efficiency of the process, a flow setup was designed providing a chemoenzymatic entry into a series of N-functionalized Neu5Ac derivatives in conversions of 48-82%, and showing excellent stability over 1 week of continuous use.
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Affiliation(s)
- Victor R. L. J. Bloemendal
- Institute for Molecules and MaterialsRadboud UniversityHeyendaalseweg 1356525 AJNijmegen, TheNetherlands
| | - Sam J. Moons
- Institute for Molecules and MaterialsRadboud UniversityHeyendaalseweg 1356525 AJNijmegen, TheNetherlands
| | - Jurriaan J. A. Heming
- Institute for Molecules and MaterialsRadboud UniversityHeyendaalseweg 1356525 AJNijmegen, TheNetherlands
| | - Mohamed Chayoua
- Institute for Molecules and MaterialsRadboud UniversityHeyendaalseweg 1356525 AJNijmegen, TheNetherlands
| | - Olaf Niesink
- Institute for Molecules and MaterialsRadboud UniversityHeyendaalseweg 1356525 AJNijmegen, TheNetherlands
| | - Jan C. M. van Hest
- Bio-organic chemistryEindhoven University of TechnologyP.O. Box 513 (STO 3.31)5600 MBEindhoven, TheNetherlands
| | - Thomas J. Boltje
- Institute for Molecules and MaterialsRadboud UniversityHeyendaalseweg 1356525 AJNijmegen, TheNetherlands
| | - Floris P. J. T. Rutjes
- Institute for Molecules and MaterialsRadboud UniversityHeyendaalseweg 1356525 AJNijmegen, TheNetherlands
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8
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Schart VF, Hassenrück J, Späte AK, Dold JEGA, Fahrner R, Wittmann V. Triple Orthogonal Labeling of Glycans by Applying Photoclick Chemistry. Chembiochem 2018; 20:166-171. [DOI: 10.1002/cbic.201800740] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Indexed: 12/18/2022]
Affiliation(s)
- Verena F. Schart
- Department of Chemistry and Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
| | - Jessica Hassenrück
- Department of Chemistry and Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
| | - Anne-Katrin Späte
- Department of Chemistry and Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
| | - Jeremias E. G. A. Dold
- Department of Chemistry and Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
| | - Raphael Fahrner
- Department of Chemistry and Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
| | - Valentin Wittmann
- Department of Chemistry and Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
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9
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Hunter CD, Khanna N, Richards MR, Rezaei Darestani R, Zou C, Klassen JS, Cairo CW. Human Neuraminidase Isoenzymes Show Variable Activities for 9- O-Acetyl-sialoside Substrates. ACS Chem Biol 2018; 13:922-932. [PMID: 29341588 DOI: 10.1021/acschembio.7b00952] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Recognition of terminal sialic acids is central to many cellular processes, and structural modification of sialic acid can disrupt these interactions. A prominent, naturally occurring, modification of sialic acid is 9- O-acetylation (9- O-Ac). Study of this modification through generation and analysis of 9- O-Ac sialosides is challenging because of the lability of the acetate group. Fundamental questions regarding the role of 9- O-Ac sialic acids remain unanswered, including what effect it may have on recognition and hydrolysis by the human neuraminidase enzymes (hNEU). To investigate the substrate activity of 9- O-acetylated sialic acids (Neu5,9Ac2), we synthesized an acetylated fluorogenic hNEU substrate 2'-(4-methylumbelliferyl)-9- O-acetyl-α-d- N-acetylneuraminic acid. Additionally, we generated a panel of octyl sialyllactosides containing modified sialic acids including variation in linkage, 9- O-acetylation, and C-5 group (Neu5Gc). Relative rates of substrate cleavage by hNEU were determined using fluorescence spectroscopy and electrospray ionization mass spectrometry. We report that 9- O-acetylation had a significant, and differential, impact on sialic acid hydrolysis by hNEU with general substrate tolerance following the trend of Neu5Ac > Neu5Gc ≫ Neu5,9Ac2 for NEU2, NEU3, and NEU4. Both NEU2 and NEU3 had remarkably reduced activity for Neu5,9Ac2 containing substrates. Other isoenzymes appeared to be more tolerant, with NEU4 even showing increased activity on Neu5,9Ac2 substrates with an aryl aglycone. The impact of these minor structural changes to sialic acid on hNEU activity was unexpected, and these results provide evidence of the substantial influence of 9- O-Ac modifications on hNEU enzyme substrate specificity. Furthermore, these findings may implicate hNEU in processes governed by 9- O-acetyltransferases and -esterases.
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Affiliation(s)
- Carmanah D. Hunter
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton Alberta T6G 2G2, Canada
| | - Neha Khanna
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton Alberta T6G 2G2, Canada
| | - Michele R. Richards
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton Alberta T6G 2G2, Canada
| | - Reza Rezaei Darestani
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton Alberta T6G 2G2, Canada
| | - Chunxia Zou
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton Alberta T6G 2G2, Canada
| | - John S. Klassen
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton Alberta T6G 2G2, Canada
| | - Christopher W. Cairo
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton Alberta T6G 2G2, Canada
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10
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Bao L, Ding L, Hui J, Ju H. A light-up imaging protocol for neutral pH-enhanced fluorescence detection of lysosomal neuraminidase activity in living cells. Chem Commun (Camb) 2018; 52:12897-12900. [PMID: 27738670 DOI: 10.1039/c6cc07574f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A lysosome-accessing nanoprobe is designed for recognition of lysosomal neuraminidases (Lyso-Neus), which can cleave the 4-methylumbelliferone moieties of the substrate from the nanoprobe, and lead to the escape of the moieties from acidic lysosomes into the neutral cytosol assisted by cationic poly(ethyleneimine) to light up the pH-responsive fluorescence for visual detection and dynamic tracking of Lyso-Neu activity in living cells.
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Affiliation(s)
- Lei Bao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China.
| | - Lin Ding
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China.
| | - Jingjing Hui
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China.
| | - Huangxian Ju
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China.
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11
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McCombs JE, Zou C, Parker RB, Cairo CW, Kohler JJ. Enhanced Cross-Linking of Diazirine-Modified Sialylated Glycoproteins Enabled through Profiling of Sialidase Specificities. ACS Chem Biol 2016; 11:185-92. [PMID: 26541974 DOI: 10.1021/acschembio.5b00775] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sialic-acid-mediated interactions play critical roles on the cell surface, providing an impetus for the development of methods to study this important monosaccharide. In particular, photo-cross-linking sialic acids incorporated onto cell surfaces have allowed covalent capture of transient interactions between sialic acids and sialic-acid-recognizing proteins via cross-linking. However, natural sialic acids also present on the cell surface compete with photo-cross-linking sialic acids in binding events, limiting cross-linking yields. In order to improve the utility of one such photo-cross-linking sialic acid, SiaDAz, we examined a number of sialidases, enzymes that remove sialic acids from glycoconjugates, to find one that would cleave natural sialic acids but remain inactive toward SiaDAz. Using this sialidase, we improved SiaDAz-mediated cross-linking of an antisialyl Lewis X antibody and of endoglin. This protocol can be applied generally to sialic-acid-mediated interactions and will facilitate identification of sialic acid binding partners.
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Affiliation(s)
- Janet E. McCombs
- Department
of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, Texas 75390-9038, United States
| | - Chunxia Zou
- Alberta
Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Randy B. Parker
- Department
of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, Texas 75390-9038, United States
| | - Christopher W. Cairo
- Alberta
Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Jennifer J. Kohler
- Department
of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, Texas 75390-9038, United States
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12
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Fluorescently labelled glycans and their applications. Glycoconj J 2015; 32:559-74. [DOI: 10.1007/s10719-015-9611-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Revised: 07/13/2015] [Accepted: 07/15/2015] [Indexed: 01/20/2023]
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13
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Zamora CY, Ryan MJ, d'Alarcao M, Kumar K. Sialidases as regulators of bioengineered cellular surfaces. Glycobiology 2015; 25:784-91. [PMID: 25795684 DOI: 10.1093/glycob/cwv019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Accepted: 03/11/2015] [Indexed: 12/13/2022] Open
Abstract
Human sialidases (NEUs) catalyze the removal of N-acetyl neuraminic acids from the glycome of the cell and regulate a diverse repertoire of nominal cellular functions, such as cell signaling and adhesion. A greater understanding of their substrate permissivity is of interest in order to discern their physiological functions in disease states and in the design of specific and effective small molecule inhibitors. Towards this, we have synthesized soluble fluorogenic reporters of mammalian sialidase activity bearing unnatural sialic acids commonly incorporated into the cellular glycocalyx via metabolic glycoengineering. We found cell-surface sialidases in Jurkat capable of cleaving unnatural sialic acids with differential activities toward a variety of R groups on neuraminic acid. In addition, we observed modulated structure-activity relationships when cell-surface sialidases were presented glycans with unnatural bulky, hydrophobic or fluorinated moieties incorporated directly via glycoengineering. Our results confirm the importance of cell-surface sialidases in glycoengineering incorporation data. We demonstrate the flexibility of human NEUs toward derivatized sugars and highlight the importance of native glycan presentation to sialidase binding and activity. These results stand to inform not only metabolic glycoengineering efforts but also inhibitor design.
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Affiliation(s)
| | - Matthew J Ryan
- Department of Chemistry, Tufts University, Medford, MA, USA
| | - Marc d'Alarcao
- Department of Chemistry, San José State University, San José, CA, USA
| | - Krishna Kumar
- Department of Chemistry, Tufts University, Medford, MA, USA Cancer Center, Tufts Medical Center Boston, Boston, MA, USA
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14
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Johannes M, Reindl M, Gerlitzki B, Schmitt E, Hoffmann-Röder A. Synthesis and biological evaluation of a novel MUC1 glycopeptide conjugate vaccine candidate comprising a 4'-deoxy-4'-fluoro-Thomsen-Friedenreich epitope. Beilstein J Org Chem 2015; 11:155-161. [PMID: 25670999 PMCID: PMC4311645 DOI: 10.3762/bjoc.11.15] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 01/02/2015] [Indexed: 02/03/2023] Open
Abstract
The development of selective anticancer vaccines that provide enhanced protection against tumor recurrence and metastasis has been the subject of intense research in the scientific community. The tumor-associated glycoprotein MUC1 represents a well-established target for cancer immunotherapy and has been used for the construction of various synthetic vaccine candidates. However, many of these vaccine prototypes suffer from an inherent low immunogenicity and are susceptible to rapid in vivo degradation. To overcome these drawbacks, novel fluorinated MUC1 glycopeptide-BSA/TTox conjugate vaccines have been prepared. Immunization of mice with the 4’F-TF-MUC1-TTox conjugate resulted in strong immune responses overriding the natural tolerance against MUC1 and producing selective IgG antibodies that are cross-reactive with native MUC1 epitopes on MCF-7 human cancer cells.
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Affiliation(s)
- Manuel Johannes
- Department of Chemistry and Center of Integrated Protein Science Munich (CIPSM), Ludwig-Maximilians University, Butenandtstraße 5-13, D-81377 Munich, Germany
| | - Maximilian Reindl
- Department of Chemistry and Center of Integrated Protein Science Munich (CIPSM), Ludwig-Maximilians University, Butenandtstraße 5-13, D-81377 Munich, Germany
| | - Bastian Gerlitzki
- Institute for Immunology, University Medical Center of the Johannes Gutenberg-University Mainz, Langenbeckstraße 1, Geb. 708, D-55101 Mainz, Germany
| | - Edgar Schmitt
- Institute for Immunology, University Medical Center of the Johannes Gutenberg-University Mainz, Langenbeckstraße 1, Geb. 708, D-55101 Mainz, Germany
| | - Anja Hoffmann-Röder
- Department of Chemistry and Center of Integrated Protein Science Munich (CIPSM), Ludwig-Maximilians University, Butenandtstraße 5-13, D-81377 Munich, Germany
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Abstract
A review of known small molecule inhibitors and substrates of the human neuraminidase enzymes.
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Affiliation(s)
- Christopher W. Cairo
- Alberta Glycomics Centre
- Department of Chemistry
- University of Alberta
- Edmonton Alberta
- Canada
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