Synthesis and in silico characterization of artificially phosphorylated glycosaminoglycans
Krzysztof Bojarski , Jana Becher , Thomas Riemer , Katharina Lemmnitzer , Stephanie Möller , Jürgen Schiller , Matthias Schnabelrauch , Sergey Samsonov
AbstractGlycosaminoglycans (GAGs) are key players in many important biologically relevant processes occurring in the extracellular matrix (ECM) thanks to their interactions with various protein targets. Chemically, GAGs represent a particular class of linear anionic polysaccharides with alternating monosaccharide units classified into several groups depending on their disaccharide unit composition and glycosidic linkage type. In addition, different sulfation patterns of these saccharides contribute to their significant heterogeneity. Recently, it was shown that chemical modifications of GAGs such as additional sulfation could lead to the attenuation of their function in biochemical processes in ECM, which is promising for applications in cell signaling, drug delivery and tissue engineering. Other potential chemical modifications for this class of molecules could be of practical significance and, therefore, should be increasingly considered in GAG research. In our work, we aimed, for the first time, to synthesize and characterize phosphorylated GAGs using experimental and computational approaches. Phosphorylation could be an attractive modification of GAGs because: (i) they would be resistant against GAG-specific glycosidases; (ii) a phosphate group could be protonated and deprotonated under physiological conditions suggesting a broader pattern of potential physicochemical properties; (iii) due to the high crosslinking ability of phosphates, related phosphorylated GAG (pGAG) hydrogels provide an interesting route to functional ECM-like structure, and potential biomaterial formulations for drug release or tissue regenerations. We report data on the synthesis of pGAGs in different reaction systems, their analytical characterization by MS and NMR approaches. Then, pGAGs as well as their monosaccharide components were systematically described by means of theoretical methods and compared to sulfated GAGs. Furthermore, we characterized the putative pGAG recognition by several well-characterized protein partners of the corresponding sulfated GAGs. Our results suggest that this novel class of molecules represents an interesting topic of GAG research despite the observed challenges in their synthetic production.
|Journal series||Journal of Molecular Structure, ISSN 0022-2860, (A 20 pkt)|
|Publication size in sheets||0.75|
|Keywords in English||Hyaluronan, phosphorylation, crosslinking, conformational analysis, protein-glycosaminoglycan interactions|
|ASJC Classification||; ; ;|
|Score||= 20.0, 05-08-2019, ArticleFromJournal|
|Publication indicators||: 2016 = 0.751; : 2017 = 2.011 (2) - 2017=1.784 (5)|
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