Proteins in the exudation sap from birch trees, Betula platyphylla Sukatchev var. Japonica Hara and Betula verrucosa Her
2001
Jiang, H. (Hokkaido Univ., Sapporo (Japan)) | Sakamoto, Y. | Tamai, Y. | Terazawa, M.
A complete analysis of the amino acids and proteins in the sap of Betula platyphylla Sukatchev var. japonica Hara and Betula verrucosa Her was conducted. N-terminal amino acid sequence analyses of the proteins revealed that a protein of 22 kDa in the sap of B. platyphylla var. japonica had high similarity with a protein of 25 kDa in the sap of B. verrucosa (97 % similarity). Moreover, these proteins had relatively high similarity with some proteins isolated from other plant sources such as flax, corn or tomato (65-74 % similarity), which are antifungal proteins. The amount of total amino acids and proteins increased as much as two-fold in the last stage of the season.
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