Structural elucidation of anti-metastatic rhamnogalacturonan II from the pectinase digest of citrus peels (Citrus unshiu)
- Authors
- Park, Hye-Ryung; Park, Su Beom; Hong, Hee-Do; Suh, Hyung Joo; Shin, Kwang-Soon
- Issue Date
- 1월-2017
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Citrus peels; Anti-metastatic activity; Rhamnogalacturonan II; Polysaccharide; Pectin
- Citation
- INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, v.94, pp.161 - 169
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
- Volume
- 94
- Start Page
- 161
- End Page
- 169
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/85049
- DOI
- 10.1016/j.ijbiomac.2016.09.100
- ISSN
- 0141-8130
- Abstract
- The aim of this study was to characterize a polysaccharide found in citrus peels with an anti-metastatic property. CPE-II was purified by the pectinase digestion of citrus peels. During in vivo lung metastasis of Colon26-M3.1, administration of 10 mu g of CPE-II per mouse showed 81.3% inhibition of metastasis. CPE-II consists of 15 different monosaccharides and 22 different glycosyl linkages, characteristic of rhamnogalacturonan II (RG-II). The primary structure was elucidated based on sugar composition, methylation analysis, oligosaccharide analysis, and sequencing using GC, GC-MS, LC-MS, and ESL-MS/MS analyses. Sequential degradation using partial acid hydrolysis indicated that CPE-II contained Rhap-(1 -> 5)-Kdo, Araf-(1 -> 5)-Dha, an AceA-containing nonasaccharide, and an uronic acid-rich oligosaccharide in addition to an alpha-(1 -> 4)-galacturono-oligosaccharide main chain. The molecular weight of CPE-II was observed to decrease from 9 to 5 kDa at a pH value of <2.0, as observed by HPSEC. Thus, we propose that the anti-metastatic CPE-II is primarily present as an RG-II dimer. (C) 2016 Elsevier B.V. All rights reserved.
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