title: Isolation and characterization of three protein proteinase isoinhibitors from the granular fraction of horse neutrophilic granulocytes.
abstract: Three cathodically migrating protein protease isoinhibitors were isolated from the granule-rich fraction of equine neutrophilic granulocytes by means of FPLC chromatography, in addition to two previously described anodically migrating inhibitors. The three isoinhibitors had an identical enzyme specificity which was equal to the two previously described isoinhibitors; they inhibited exclusively proteinase K and subtilisin. The inhibitors retained their activity between pH 1 and 12. They also were heat stable at 100 degrees C for 20 min. Neither the biological function of isoinhibitors nor the fundamental role of granular protease inhibitors of such narrow and peculiar enzyme specificity are known.
authors.affiliation: Department of Veterinary Physiology, University of Zürich, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Pellegrini
authors.forename: G
authors.initials: G
authors.lastname: Hägeli
authors.forename: R
authors.initials: R
authors.lastname: von Fellenberg
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D006736:Horses; D007700:Kinetics; D009504:Neutrophils / Q000032:analysis*; D011480:Protease Inhibitors / Q000097:blood* / Q000302:isolation & purification; D013816:Thermodynamics
chemical_list: D011480:Protease Inhibitors