Collect. Czech. Chem. Commun. 1989, 54, 2276-2286

Isolation and partial characterization of a peptidase with trypsin-like activity from bovine adenohypophysis

Tsezengijn Dasha, Tomislav Bartha, Jiřina Slaninováa, Jana Barthováb, Hana P. Maškováa, Karel Hauzera and Evžen Kasafírekc

a Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6
b Department of Biochemistry, Charles University, 128 30 Prague 2
c Research Institute for Pharmacy and Biochemistry, 130 00 Prague 3


A reproducible method has been developed for the isolation of the adenohypophyseal enzyme with a trypsin-like activity. The enzyme is able to hydrolyze Nα-benzoyl-L-arginine-p-nitroanilide, a fluorogenic substrate CBzl-Arg-Arg-β-naphthyl amide and some peptides with one or two accumulated basic amino acids in the chain. The optimum pH for hydrolysis of the chromogenic substrate was within the range 6.0-7.0 (Km = 0.66 mmol l-1), in the case of the fluorogenic substrate the range was between 7.0 and 7.5 (Km = 1.2 μmol l-1). The enzyme is activated by cysteine and dithiothreitol and inhibited by SH-poisons. The molecular weight of the enzyme, determined by means of two independent methods, was approximately 25 kDA.