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Development and Growth Regulation

The Lectins of Sophora japonica

I. Purification Properties and N-Terminal Amino Acid Sequences of Two Lectins from Leaves

Department of Biochemistry, University of California, Riverside, California 92521

Two lectins, Leaf Lectin I and Leaf Lectin II (LLI and LLII) were purified from the leaves of Sophora japonica. Like the Sophora seed lectin, LLI and LLII are tetrameric glycoproteins containing a single subunit with respect to size. The subunits of LLI (32 kilodaltons) and LLII (34 kilodaltons) are slightly larger than those of the seed lectin (29.5 kilodaltons). The three Sophora lectins display indistinguishable specificities, amino acid compositions, specific hemagglutinin activities, and extinction coefficients. Although very closely related to the seed lectin, the leaf and seed lectins are not immunologically identical and they differ in subunit molecular weights, carbohydrate content, and in the pH sensitivity of their hemagglutinin activities. N-terminal amino acid sequence analysis shows that although they are homologous proteins, the three Sophora lectins are products of distinct genes.