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Biochem J. Mar 15, 1988; 250(3): 903–909.
PMCID: PMC1148941

Affinity purification and biochemical characterization of histolysin, the major cysteine proteinase of Entamoeba histolytica.

Abstract

We report a one-step method for the purification to homogeneity of a cysteine proteinase of Entamoeba histolytica (histolysin) by affinity chromatography of the soluble extract of the parasite on immobilized phenylalanyl(2-phenyl)aminoacetaldehyde semicarbazone. The enzyme has an apparent Mr of 26,000 by SDS/polyacrylamide-gel electrophoresis and 29,000 by gel chromatography. Its pH optimum varies widely, from 5.5 with azocasein to approx. 7 with other protein substrates and benzyloxycarbonylphenylalanyl-L-citrullylaminomethylcourmarin++ + (Z-Phe-Cit-NHMec), and to 9.5 with benzyloxycarbonylphenylalanylarginylaminomethylcoumarin (Z-Phe-Arg-NHMec) and benzyloxycarbonylarginylarginylaminomethylcourmarin (Z-Arg-Arg-NHMec). Values of Km, kcat. and kcat/Km are 1.5 microM, 130 s-1 and 87 X 10(6) M-1.s-1 for Z-Arg-Arg-NHMec, and 32 microM, 0.4 s-1 and 0.012 x 10(6) M-1.s-1 for Z-Phe-Arg-NHMec, respectively, at pH 7.5 and 37 degrees C. The enzyme is inhibited by leupeptin and such inhibitors of cysteine proteinases as L-transepoxysuccinyl-L-leucylamido-4-(guanidino)butane, peptidyldiazomethanes, iodoacetic acid and chicken cystatin. The tentative N-terminal amino acid sequence of the enzyme closely resembles that of papain. Histolysin does not degrade type I collagen or elastin, but it is active against cartilage proteoglycan and kidney glomerular basement-membrane collagen. It also detaches cells from their substratum in vitro, and could well play a role in tissue invasion.

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Selected References

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