Isolation and characterization of cathepsin B from rabbit testis
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Summary. Cathepsin B (EC 3.4.22.1) has been purified from rabbit testes to apparent homogeneity by chromatography on DE-52, affinity chromatography on organomercurial agarose and subsequent gel filtrations on Sephadex G-75. The enzyme is composed of a single polypeptide of Mr 23 000. Thiol blocking agents and leupeptin abolished the activity of the enzyme completely. The enzyme showed maximum activity at pH 6·0 and 43°C, required 2 mm-cysteine for the optimal activity and had a Km1·45 × 10−3 m using Z-Arg-β-naphthylamide as the substrate. However, Z-Arg-Arg-β-naphthylamide was 12 times more sensitive as a substrate than was Z-Arg-β-naphthylamide. Rabbit testicular cathepsin B hydrolysed intact proteins. An endogenous inhibitor isolated from the rabbit testes inhibited purified Cathepsin B.
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