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J. Biol. Chem., Vol. 259, Issue 18, 11312-11320, Sep, 1984
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.
Purification and partial characterization of a beta-glucan fragment that elicits phytoalexin accumulation in soybean
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