Abstract
Arabinogalactan proteins (AGPs) are plant-specific glycoproteins involved in cellular mechanics and signal transduction. There has been major progress in understanding the structure, synthesis, and molecular functions of their carbohydrate chains; however, the mechanisms by which they function as signalling molecules remain unclear. Here, methyl-glucuronosyl arabinogalactan (AMOR; Me-GlcA-β(1,6)-Gal), a disaccharide structure at the end of AGP carbohydrate chains, was oligomerised via chemical synthesis. The biological activity of AMOR oligomers was enhanced via clustering of the carbohydrate chains. Furthermore, AMOR oligomers yielded a pollen tube morphology (i.e., callose plug formation) similar to that when cultured with native AMOR, suggesting it may be functionally similar to native AMOR.
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