title: Trypsin inhibitor from the seeds of Acacia confusa.
abstract: A trypsin inhibitor (ACTI) was isolated and purified from the seeds of Acacia confusa by gel filtration, and trypsin-Sepharose 4B column affinity chromatography. The molecular weight of ACTI was found to be 21,000 +/- 1,000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and amino acid composition analysis. ACTI contained four half-cystine and no methionine residues, and was rich in aspartic acid, glutamic acid, glycine, leucine, and lysine residues. The native trypsin inhibitor was composed of two polypeptide chains, and it inhibited trypsin and alpha-chymotrypsin stoichiometrically at the molar ratio of 1:1 and 2:1, respectively. The amino-terminal sequence analysis of the A. confusa trypsin inhibitor A and B chains revealed a more extensive homology with Acacia elata and silk tree trypsin inhibitors, and a less extensive homology with Kunitz soybean trypsin inhibitor.
authors.affiliation: Institute of Biochemistry, College of Medicine, National Taiwan University.
authors.forename: J Y
authors.initials: JY
authors.lastname: Lin
authors.forename: S C
authors.initials: SC
authors.lastname: Chu
authors.forename: H C
authors.initials: HC
authors.lastname: Wu
authors.forename: Y S
authors.initials: YS
authors.lastname: Hsieh
mesh_terms: D000045:Acacia / Q000737:chemistry*; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D008969:Molecular Sequence Data; D008970:Molecular Weight; D012689:Sequence Homology, Nucleic Acid; D014361:Trypsin Inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000596:Amino Acids; D014361:Trypsin Inhibitors