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The complete amino acid sequence of trypsin inhibitor DE-3 from Erythrina latissima seeds.

Trypsin inhibitor DE-3 from Erythrina latissima seeds contains 172 amino acids, including 4 half-cystine residues, and resembles the Kunitz-type inhibitors. Limited hydrolysis of DE-3 with trypsin at pH 3 produced two fragments, F1 and F2, containing 63 and 109 amino acids, respectively. Amino-terminal sequence studies revealed that F1 was the N-terminal and that F2 was the C-terminal fragment. The complete amino acid sequence of fragments F1 and F2 was then determined on peptides produced by enzymatic digestion with trypsin and Staphylococcus aureus V8 protease. The sequence of trypsin inhibitor DE-3 from E. latissima seeds shows a high degree of homology to those of Kunitz-type trypsin inhibitors from soybeans and winged bean seeds.[1]

References

  1. The complete amino acid sequence of trypsin inhibitor DE-3 from Erythrina latissima seeds. Joubert, F.J., Heussen, C., Dowdle, E.B. J. Biol. Chem. (1985) [Pubmed]
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