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A novel sialidase-activatable fluorescence probe with improved stability for the sensitive detection of sialidase. Bioorg Med Chem Lett 2019; 30:126860. [PMID: 31839541 DOI: 10.1016/j.bmcl.2019.126860] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/21/2019] [Accepted: 11/26/2019] [Indexed: 11/24/2022]
Abstract
Sialidases catalyse the hydrolysis of terminal sialic acid residues of various glycoconjugates and visualising sialidase activity is important for understanding its function in the biological and pathological context. Upon developing a novel fluorescence probe for sialidase with improved fluorescence characteristics based on our previously reported fluorophore, HMRef, an inherent instability of sialic acid conjugates was found to both reduce selectivity and sensitivity. We aimed at increasing the stability of the probes by incorporating a self-immolative spacer with a higher pKa between the sialic acid residue and HMRef to develop HMRef-S-Neu5Ac, which shows superior stability allowing for the specific detection of sialidase.
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Schwardt O, Gäthje H, Vedani A, Mesch S, Gao GP, Spreafico M, von Orelli J, Kelm S, Ernst B. Examination of the Biological Role of the α(2→6)-Linked Sialic Acid in Gangliosides Binding to the Myelin-Associated Glycoprotein (MAG). J Med Chem 2009; 52:989-1004. [DOI: 10.1021/jm801058n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Oliver Schwardt
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Institute for Physiological Biochemistry, University Bremen, D-28334 Bremen, Germany
| | - Heiko Gäthje
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Institute for Physiological Biochemistry, University Bremen, D-28334 Bremen, Germany
| | - Angelo Vedani
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Institute for Physiological Biochemistry, University Bremen, D-28334 Bremen, Germany
| | - Stefanie Mesch
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Institute for Physiological Biochemistry, University Bremen, D-28334 Bremen, Germany
| | - Gan-Pan Gao
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Institute for Physiological Biochemistry, University Bremen, D-28334 Bremen, Germany
| | - Morena Spreafico
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Institute for Physiological Biochemistry, University Bremen, D-28334 Bremen, Germany
| | - Johannes von Orelli
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Institute for Physiological Biochemistry, University Bremen, D-28334 Bremen, Germany
| | - Sørge Kelm
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Institute for Physiological Biochemistry, University Bremen, D-28334 Bremen, Germany
| | - Beat Ernst
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Institute for Physiological Biochemistry, University Bremen, D-28334 Bremen, Germany
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Shelke SV, Gao GP, Mesch S, Gäthje H, Kelm S, Schwardt O, Ernst B. Synthesis of sialic acid derivatives as ligands for the myelin-associated glycoprotein (MAG). Bioorg Med Chem 2007; 15:4951-65. [PMID: 17507233 DOI: 10.1016/j.bmc.2007.04.038] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2006] [Revised: 04/11/2007] [Accepted: 04/20/2007] [Indexed: 11/27/2022]
Abstract
The trisaccharide substructure 13 of the ganglioside GQ1balpha shows a remarkable affinity for the myelin-associated glycoprotein (MAG). In the search for structurally simplified and pharmacokinetically improved mimics of 13, sialosides with modifications at the reducing and non-reducing end were synthesized. The biological evaluation of mimics 12a-o was performed in a competitive target-based assay. It was found that the relative inhibitory potency (rIP) of antagonist 12h was enhanced by more than 1000-fold in comparison to the reference trisaccharide 13, despite the former having a much simpler structure. In addition, the sialic acid derivatives, for example, 12h, have clearly improved pharmacokinetic properties due to the presence of aromatic moieties, a lower molecular weight, and a reduced number of polar hydroxy functions compared to the reference compound 13.
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Affiliation(s)
- Sachin V Shelke
- Institute of Molecular Pharmacy, Pharmacenter, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland
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