期刊
CARBOHYDRATE POLYMERS
卷 158, 期 -, 页码 93-101出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.11.082
关键词
Plant polysaccharides; Rhamnogalacturonan I; Galactan; Molecular dynamics; Flax fibers
资金
- Russian Foundation for Fundamental Research [16-04-01350 a]
- French Embassy in Russia in term of exchange program 'Metchnikov'
- Centre de Recherches sur les Macromolecules Vegetales
Within the family of plant cell wall polysaccharides rhamnogalacturonans I are the most diverse and structurally complex members. In present study we characterize the 3-dimensional structures and dynamic features of the constituents of RG-I along MD trajectories. It is demonstrated that extended threefold helical structure of the rhamnogalacturonan linear backbone is the most energetically favorable motif. Branching helps to stabilize a conformer of the backbone twisted along 1 -> 2 glycosidic linkage triggering the orientation of long side chains without altering the extended overall backbone chain conformation. Formation of anti-parallel pairing of the beta-galactan side chains allows us to suggest a novel mode of non-covalent cross-linking in pectins. Studied structural elements are organized to report the first attempt to characterize 3D structure of RG-I focusing on the special case of flax tertiary cell wall and elucidate the structural basis underlying the formation of RG-I self-associates and functional role of RG-I in planta. (C) 2016 Elsevier Ltd. All rights reserved.
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