May 16, 1985

A new serine protease which preferentially recognizes p-guanidino-L-phenylalanyl residue in ascitic plasma from Ehrlich ascites tumor-bearing mice

Biochemical and Biophysical Research Communications
H TsunematsuY Tsunematsu


A new enzyme which hydrolyzes anilide substrates of p-guanidino-L-phenylalanine in preference to those of arginine was found in the ascitic plasma from Ehrlich ascites tumor-bearing mice. The activity of this enzyme on N alpha-benzyloxycarbonyl-p-guanidino-L-phenylalanine p-nitroanilide was strongly inhibited by diisopropyl fluorophosphate and phenylmethanesulfonyl fluoride but not by sulfhydryl-reactive reagents and metal chelating agents. Peptide substrates containing p-guanidino-L-phenylalanine were hydrolyzed by this enzyme much faster than those containing arginine. These results suggest that this enzyme is a different type of serine protease from trypsin and thrombin. This enzyme was also found in the human gastric and colon cancer cells and their surrounding ascitic plasmas.

Mentioned in this Paper

Arginine hydrochloride
F2 gene
Chelating Agents
Sulfhydryl Compounds
Serine Endopeptidases

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