Rhamnogalacturonan-II—a biologically active fragment

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Abstract
Rhamnogalacturonan-II inhibited the uptake of [14C]leucine and, consequently, the incorporation of [14C]leucine into acid-precipitable proteins by suspension-cultured tomato cells. Fractionation of rhamnogalacturonan-II showed that the lower molecular components were the most effective. KDO and apiose, both constituents of rhamnogalacturonan-II, also inhibited [14C]leucine incorporation weakly, suggesting that these sugar residues may be an integral requirement for the biological activity of rhamnogalacturonan-II. The incorporation of [14C]glutamate and [14C]histidine, and to a lesser extent [14C]proline and [14C]arginine, was also inhibited by rhamnogalacturonan-II; the incorporation of [14C]tyrosine and [14C]phenylalanine was little affected. This suggests that rhamnogalacturonan-II exerts its effect by acting on certain membrane transport systems.

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