Characterization of thiamin-binding proteins from plant seeds
1999
Watanabe, K. (Kinki Univ., Higashiosaka, Osaka (Japan). Faculty of Agriculture)
Thiamin-binding proteins from plant seeds are interesting storage proteins because they have dual functions : retention of thiamin in dormant seeds and provision of a nitrogen source at germination. The thiamin-binding proteins differ in molecular mass, subunit structure, amino acid composition, optimum pH for thiamin-binding activity, and binding affinity for thiamin and thiamin analogs. However, they all specifically bind free thiamin but not thiamin phosphates, which is a characteristic property of thiamin-binding proteins from plant seeds, and have a common mechanism of thiamin binding. This information suggests that the nutritive quality of seeds might be improved by using genetic engineering techniques with the genes producing thiamin-binding proteins
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