Pectin is one of the major plant cell wall components. It is constituted by highly complex and heterogeneous polysaccharides, which contribute to the modulation of several physiological processes such as cell growth and differentiation, cell-cell adhesion and cell wall support, and defense mechanisms.[1,2] Rhamnogalacturonan I (RG-I) is one of the structural domains of pectic polysaccharides, along with homogalacturonan, rhamnogalacturonan II, xylogalacturonan, and apiogalacturonan. Structurally diverse and complex, RG-I polysaccharides have a backbone consisting of [→2)-α-L-Rhap-(1→4)-α-D-GalA-(1→] disaccharide repeats, with numerous branching side-chains of galactans, arabinans, or arabinogalactans, generally found at the C-4 position of L-rhamnose residues.[3]
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