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J. Biol. Chem., Vol. 259, Issue 18, 11312-11320, Sep, 1984

Purification and partial characterization of a beta-glucan fragment that elicits phytoalexin accumulation in soybean

JK Sharp, B Valent and P Albersheim

The synthesis of phytoalexins (antibiotics) in plant cells is induced by molecules called elicitors. Partial acid hydrolysis of mycelial walls of Phytophthora megasperma f. sp. glycinea solubilized a multicomponent mixture of elicitor-active and elicitor-inactive oligoglucosides. One elicitor-active and seven elicitor-inactive hexa(beta-D-glucopyranosyl)-D-glucitols were purified by gel- filtration, normal-phase partition, and reversed-phase liquid chromatography after reduction with NaBH4. The elicitor-active and all but one of the elicitor-inactive hexa(beta-D-glucopyranosyl)-D- glucitols consisted of 3-, 6-, and 3,6-linked glucopyranosyl residues. The eighth hexa (beta-D-glucopyranosyl)-D-glucitol consisted of beta-4- linked glucopyranosyl residues. The similarity of the structural characteristics of six of the elicitor-inactive hexa(beta-D- glucopyranosyl)-D-glucitols to the elicitor-active hexa(beta-D- glucopyranosyl)-D-glucitol suggested that a highly specific carbohydrate structure was required for elicitor activity.
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