Tight-binding inhibition of cathepsin S by cystatins.
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Human cystatins A, B and C were purified, and their inhibition efficiency was tested with the cysteine proteinase cathepsin S. Cathepsin S was strongly inhibited by cystatins A and B in the subnanomolar range and by cystatin C in the picomolar range. Two steps of inhibition of cathepsin S by the cystatins which involve slow binding are discussed.