Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 128, Issue -, Pages 459-467Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2019.01.129
Keywords
Ginseng flower buds; Polysaccharides; Pectin; Galectin-3
Funding
- National Natural Science Foundation of China [31770852]
- Scientific and Technologic Foundation of Jilin Province [20180101004JC]
- Natural Science Foundation of Changchun City of China [17YJ004]
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Water-soluble pectic polysaccharides isolated from Panax ginseng flower buds (WGFPA) were completely fractionated into six homogeneous fractions (WGFPA-1a, WGFPA-2a, WGFPA-3a, WGFPA-1b, WGFPA-2b and WGFPA-3b) by a combination of ion-exchange and size exclusion chromatographies. Monosaccharide composition, enzymatic hydrolysis and C-13 nuclear magnetic resonance (NMR) spectra analysis were combined to characterize their structural features. Furthermore, the interactions between these polysaccharides and galectin-3 were evaluated by biolayer interferometry assay. The results showed that WGFPA-1 a, WGFPA-2a and WGFPA-3a were rhamnogalacturonan I (RG-I) type pectin with abundant side chains, including alpha-L-1,5-arabinan,beta-D-1,4-galactan, arabinogalactan I (AG-I) and arabinogalactan II (AG-II), exhibiting strong binding activities to galectin-3 with apparent KD values 4.9 mu M, 0.71 mu M and 0.24 mu M, respectively. WGFPA-1b, WGFPA-2b and WGFPA-3b were homogalacturonan (HG) type pectin covalently linked with different ratios of rhamnogalacturonan II (RG-II) domains, showing weaker or no interactions with galectin-3. This study provides useful structural information for further investigation on the structure-activity relationship of ginseng flower buds pectin. (C) 2019 Elsevier B.V. All rights reserved.
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