title: 1H-n.m.r. studies of squash seed trypsin inhibitor.
abstract: 1H-n.m.r. studies at 500 MHz have been performed on a trypsin inhibitor (CMTI-III) found in squash seed (Cucurbita maxima). The sequential resonance assignments have been made using two-dimensional techniques. The chemical shifts for the assigned protons are reported at 30 degrees, pH 2.8 and form a basis for the determination of the solution structure of CMTI-III. Analysis of the NOE data, NH-alpha CH vicinal coupling constants and pattern of slowly exchanging amide protons indicates that the predominant feature of the solution conformation is a triple stranded beta sheet consisting of residues 8-10, 21-23, and 26-29. Residues 12-15 appear to form a beta turn.
authors.affiliation: Monsanto Co., St Louis, MO.
authors.forename: J J
authors.initials: JJ
authors.lastname: Likos
mesh_terms: D000595:Amino Acid Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010940:Plant Proteins; D011487:Protein Conformation; D014361:Trypsin Inhibitors
chemical_list: D010940:Plant Proteins; D014361:Trypsin Inhibitors; C031809:trypsin inhibitor, Cucurbita sp.