Abstract
In this report, we describe the fluorescent labeling of bacterial polysaccharides (Escherichia coli O86:B7, Escherichia coli O19ab, Pseudomonas aeruginosa O10a10b, and Shigella flexneri 2b) at the “natural” amino group of their phosphoethanolamine moiety. Two protocols for labeling are compared: 1) on a scale of a few mg of the polysaccharide, with a dialysis procedure for purification from excessive reagents; and 2) on a scale of 0.1 mg of the polysaccharide, with a simple precipitation procedure instead of dialysis. The microscale version is sufficient for comfortable cytofluorometric analysis. The resulting probes were found to specifically bind to human dendritic cells in a dose-dependent manner. The used limited set of polysaccharides did not allow us even to get close to understanding which dendritic cell-associated lectins and which cognate polysaccharide epitopes are involved in recognition, but the proposed microscale protocol allows to generate a library of fluorescent probes for further mapping of the polysaccharide specificity of the dendritic cells.
Abbreviations
- BSA:
-
Bovine serum albumin
- DC:
-
Dendritic cell
- DMSO:
-
Dimethylsulfoxide
- LPS:
-
Lipopolysaccharide
- PBS:
-
Phosphate buffer saline
- PBA:
-
PBS containing 0.2% BSA
- PS:
-
Polysaccharide
- Su:
-
Succinimide
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This work was generously supported by grant 20-63-47110 of theRussian Science Foundation, and in part by grant 16-04-01084 of the Russian Foundation for Basic Research.
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Tuzikov, A.B., Rapoport, E.M., Khaidukov, S.V. et al. Synthesis of bodipy-labeled bacterial polysaccharides and their interaction with human dendritic cells. Glycoconj J 38, 369–374 (2021). https://doi.org/10.1007/s10719-021-09993-9
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DOI: https://doi.org/10.1007/s10719-021-09993-9