Biochemical characterization of human cathepsin X revealed that the enzyme is an exopeptidase, acting as carboxymonopeptidase or carboxydipeptidase

Cathepsin X, purified to homogeneity from human liver, is a single chain glycoprotein with a molecular mass of ≈ 33 kDa and pI 5.1–5.3. Cathepsin X was inhibited by stefin A, cystatin C and chicken cystatin (Ki = 1.7–15.0 nm), but poorly or not at all by stefin B (Ki > 250 nm) and l‐kininogen, re...

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