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Water extraction of semi-retted flax (Linum usitatissimum L.) fiber bundles yielded a mixture of pectic oligosaccharides and two acidic rhamnogalacturonide tetrasaccharides that were separated by size-exclusion chromatography. One- and two-dimensional nuclear magnetic resonance studies and fast atom bombardment-mass spectrometry experiments indicated that the two tetrasaccharides have a common primary structure, i.e. alpha-D-delta GalpA(1--&gt;2)-alpha-L- Rhap(1--&gt;4)-alpha-D-GalpA-(1--&gt;2)-L-alpha,beta-Rhap, with a rhamnopyranose as terminal reducing end, and a 4-deoxy-beta-L-threo-hex-4-enopyranosiduronic acid at the nonreducing end. However, the two tetrasaccharides differ by an acetyl group located at the O-3 position of the internal galacturonic acid residue. These two tetrasaccharides induce the activation of D-glycohydrolases of Rubus fructicosus L. cells or protoplasts within minutes.

Two Rhamnogalacturonide Tetrasaccharides Isolated from Semi-Retted Flax Fibers Are Signaling Molecules in Rubus fruticosus L. Cells