title: Isolation and properties of anionic protease inhibitors from buckwheat seeds.
abstract: Three protease inhibitors (BWI-1, BWI-2 and BWI-4) from buckwheat seeds were purified to homogeneity and characterized. Their molecular masses were 7.7-9.2 kDa according to gel-filtration and mass spectrometry. Amino acid analysis revealed a high content of glutamic acid and valine and a low content of isoleucine, aromatic and sulfur-containing amino acids. Data illustrating the temperature and the pH stability of the inhibitors are presented. Each of the inhibitors formed a inhibitor complex with trypsin in a molar ratio 1:1 and contained an Arg residue at the reactive site. In addition to trypsin, BWI-1 and BWI-2 inhibited chymotrypsin, however, less effectively. None of the isolated inhibitors suppressed activity of papain, leukocyte elastase, pepsin and subtilisin.
authors.affiliation: A.N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Russia. dun@funbio.genebee.msu.su
authors.forename: Y E
authors.initials: YE
authors.lastname: Dunaevsky
authors.forename: E B
authors.initials: EB
authors.lastname: Pavlukova
authors.forename: M A
authors.initials: MA
authors.lastname: Belozersky
mesh_terms: D000528:Alternaria / Q000187:drug effects; D002852:Chromatography, Ion Exchange; D005670:Fusarium / Q000187:drug effects; D011480:Protease Inhibitors / Q000302:isolation & purification* / Q000494:pharmacology; D012639:Seeds / Q000737:chemistry; D014908:Triticum / Q000737:chemistry
chemical_list: D011480:Protease Inhibitors