Abstract
Two kinds of arabinogalactan-protein (Cp-1-C and -D) were obtained from the fruit of Lycium chinense Mill. In Cp-1-C, the carbohydrate was composed of arabinose and galactose at a ratio of 3:1, and O -glycosidically linked to both the serine and threonine residues of protein. Its molecular weight was 42, 000. In Cp-1-D, the ratio of arabinose to galactose was 1:1, and the O -glycosidical junction between the carbohydrate and protein was composed of serine residue. The molecular weight was 23, 000. From the results of structural characterization, both Cp-1-C and -D were assigned to type II arabinogalactan-protein (AGP), where a (1→6) linkage of galactose occurred mainly at the branching point in the case of Cp-1-C and mainly at the linear part in Cp-1-D.
