Journal article

ARABINOGALACTAN PROTEINS FROM STIGMAS OF NICOTIANA-ALATA

A BACIC, AC GELL, AE CLARKE

PHYTOCHEMISTRY | PERGAMON-ELSEVIER SCIENCE LTD | Published : 1988

Abstract

Stigmas of Nicotiana alata, an ornamental tobacco, contain arabinogalactan proteins (AGPS) as major components (ca 65% of the buffer-soluble high Mr carbohydrate. Glycosyl linkage analyses are compatible with a model of an arabinogalactan with a 3-linked galactan backbone substituted at C(0)6 with chains of 6-linked galactopyranosyl residues terminating in arabinofuranosyl and galactopyranosyl residues. The stigma AGPs have a low content of uronic acids (0.5-1.0% glucuronic acid). As isolated, they contain only a small amount of protein that is rich in hydroxyproline, serine, alanine, threonine, glycine, glutamate/glutamine and aspartate/asparigine. They migrate as single components with low..

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University of Melbourne Researchers