title: Amino Acid Sequence of Mung Bean Trypsin Inhibitor and Its Modified Forms Appearing during Germination.
abstract: The amino acid sequence of the major trypsin inhibitor, F, of ungerminated mung beans (Vigna radiata [L.] Wilczek) was determined by a combination of automatic solid phase and manual sequencing techniques. F is a typical Bowman-Birk-type proteinase inhibitor with 80 amino acid residues and exhibits a high degree of identity with the other sequenced members of the Bowman-Birk family of inhibitors. Thin layer peptide maps of mung bean inhibitors E and C (which appear during germination) indicate that both are derived from inhibitor F by limited specific proteolysis. Loss of the carboxyl-terminal residues 77 to 80 from F produces inhibitor E, while the loss of an additional two carboxyl-terminal residues, the loss of the amino-terminal residues 1 to 8, and an internal cleavage at Ala(35)-Asp(36) produces inhibitor C from E. Another inhibitor species, E', was isolated from ungerminated seeds. It differs from F in the loss of residues 1 to 6. The majority of the proteolytic cleavages noted in the F-E-C-E' system are at peptide bonds involving aspartyl residues.
authors: Department of Biological Sciences, State University of New York at Binghamton, Binghamton, New York 13901.
authors: K A
authors: KA
authors: Wilson
authors: J C
authors: JC
authors: Chen