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A proteinase extracted with 1M NaCl from particulate fraction of the postnuclear fraction of mouse myeloid leukemia M1 cells was partially purified by Bio-Gel HTP treatment and Sephadex G-75 gel filtration. The apparent molecular mass of the proteinase was 26,000 Da and the isoelectric point was about pH 10. The enzyme activity was inhibited by phenylmethanesulfonylfluoride, chymostatin, and soy-bean trypsin inhibitor. It hydrolysed specifically Suc-Ala2-Pro-Phe-4-methylcoumaryl-4-amide (MCA). NaCl and KCl enhanced several times the activity for Suc-Ala2-Pro-Phe-MCA, but not that for fluorescein-labeled albumin and fibrinogen. These enzymic properties of the major proteinase are similar to those of chymotrypsin and cathepsin G. The role of a cathepsin G-like proteinase in relation to M1 cell differentiation is discussed.

Partial Purification and Properties of Cathepsin G-like Proteinase of Mouse Myeloid Leukemia M1 Cells