Abstract
Cysteine proteinase inhibitor (CPI) forms from human liver were purified from the tissue homogenate by alkaline denaturation of cysteine proteinases with which they are complexed, acetone fractionation, affinity chromatography on S-carboxymethyl-papain-Sepharose and chromatofocusing. The multiple forms of CPI were shown immunologically to be forms of two proteins, referred to as CPI-A (comprising the forms of relatively acidic pI) and CPI-B (comprising the more basic forms). CPI-A and CPI-B are similar in their Mr of about 12400, considerable stability to pH2, pH11 and 80 degrees C, and tight-binding inhibition of papain, several related cysteine proteinases and dipeptidyl peptidase I. Ki values were determined for papain, human cathepsins B, H and L, and dipeptidyl peptidase I. The affinity of CPI-A for cathepsin B was about 10-fold greater than that of CPI-B, whereas CBI-B showed about 100-fold stronger inhibition of dipeptidyl peptidase I. For all the cysteine proteinases the liver inhibitors were somewhat less tight binding than cystatin. The resemblance of both CPI-A and CPI-B in several respects to egg-white cystatin is discussed. CPI-A seems to correspond to the epithelial inhibitor described previously, and CPI-B to the inhibitor from other cell types [Järvinen & Rinne (1982) Biochim. Biophys. Acta 708, 210-217].
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