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Structure and anti-complementary activity of pectic polysaccharides isolated from the root of Angelica acutiloba Kitagawa by Hiroaki Kiyohara; Jong-Chol Cyong; Haruki Yamada is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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Four pectic polysaccharides (AR-2IIa-IId) with anti-complementary activity have been isolated from a hot-water extract of the root of Angelica acutiloba Kitagawa. Each of these polysaccharides contained a large proportion of GalA together with neutral sugars consisting mainly of Rha, Ara, and Gal. Digestion with endo-alpha-(1----4)-polygalacturonase indicated that AR-2IIa-IIc each contained a large proportion of enzyme-sensitive polygalacturonan regions, and that AR-2IId contained a large proportion of enzyme-resistant regions. When AR-2IId was de-esterified, it became sensitive to the enzyme. These polysaccharides also contained small proportions of enzyme-resistant regions (PG-1) which were rich in neutral sugars. Methylation analysis and base-catalysed beta-elimination studies suggested that each PG-1 contained a rhamnogalacturonan moiety in which 2,4-disubstituted Rha was attached to 4-substituted GalA through position 2 of Rha. Carboxyl-reduction and methyl- and de-esterification of these polysaccharides modulated their anti-complementary activities. Digestion with endo-alpha-(1----4)-polygalacturonase decreased the activities of AR-2IIa and -2IIb, but not those of AR-2IIc and

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Author

Hiroaki Kiyohara; Jong-Chol Cyong; Haruki Yamada

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0008-6215)

Published

1988

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)