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Biol Chem Hoppe Seyler. 1987 Nov;368(11):1505-7.

Amino-acid sequences of trypsin inhibitors from watermelon (Citrullus vulgaris) and red bryony (Bryonia dioica) seeds.

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Institute of Biochemistry, University of Wrocław, Poland.


The amino-acid sequences of two trypsin inhibitors isolated from red bryony (Bryonia dioica) and watermelon (Citrullus vulgaris) seeds are reported. Both species represent different genera of the Cucurbitaceae family, which have not been previously investigated as a source of proteinase inhibitors. The sequences are unique but are very similar to those of other proteinase inhibitors which have been isolated from squash seeds. Based on structural homology we assume that the Arg5-Ile6 peptide bond represents the reactive site bond of both inhibitors.

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