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A new low-molecular mass cysteine proteinase inhibitor (CPI) was purified from the cytosol of peripheral pig leukocytes. The isolation procedure included DEAE chromatography, Sephadex G-100 gel filtration and fast-protein liquid chromatography on Mono Q. The procedure resulted in the isolation of a homogeneous protein with a molecular mass of approximately 12 kDa and a pI of 4.8. The amino terminus is blocked. The amino-acid composition and the sequence of the C-terminal part of the molecule are suggestive of a new family of cystatins. The CPI was found to be a tight-binding inhibitor of both papain and cathepsin L, with Ki values of 0.1 nM and 1 nM, respectively.

A New Type of Low-Molecular Mass Cysteine Proteinase Inhibitor from Pig Leukocytes