Overview
Cathepsins are lysosomal proteases belonging to the peptidase family, with 15 known subtypes in humans (e.g., Cathepsin B, D, K, L). They are synthesized as inactive zymogens and activated in acidic environments. Primarily involved in intracellular protein turnover, cathepsins also regulate extracellular matrix remodeling, apoptosis, and immune responses. Dysregulation of cathepsin activity is linked to diseases like cancer, osteoporosis, and arthritis. Their substrate specificity (e.g., collagenolysis by Cathepsin K) makes them therapeutic targets. Recombinant cathepsins are widely used in biochemical assays and pharmaceutical research.
Physical and Chemical Properties
Cathepsins are globular proteins with molecular weights ranging from 20–50 kDa. Their activity is highly pH-dependent, with optimal function in acidic environments (pH 4–6). For instance, Cathepsin B exhibits endopeptidase and exopeptidase activity, while Cathepsin D is an aspartic protease. Stability varies: most are inactivated at neutral pH or by serine protease inhibitors (e.g., PMSF). Lyophilized forms retain activity for years at -20°C, whereas solutions require stabilizers like glycerol. Spectrophotometric assays (e.g., using fluorogenic substrates) measure enzymatic activity.
Main Applications
In drug development, cathepsins serve as biomarkers (e.g., Cathepsin S in inflammation) or targets (e.g., Odanacatib for osteoporosis). Cathepsin K inhibitors are explored for bone disorders, while Cathepsin L is implicated in viral entry pathways. Industrially, they are used in protein digestion for mass spectrometry and antibody production. Diagnostic kits leverage cathepsin activity to detect conditions like rheumatoid arthritis. Emerging applications include biomaterial degradation and food processing enzymes.
Safety and Storage
Cathepsins are irritants; use gloves and goggles. Some subtypes (e.g., Cathepsin B) may require Biosafety Level 2 handling due to pathogenic associations. Avoid aerosolization during reconstitution. Store lyophilized powders at -20°C in airtight containers. Solutions should include protease inhibitors (e.g., EDTA) and be aliquoted to prevent freeze-thaw degradation. Activity loss occurs rapidly at room temperature; monitor via control assays.
B2B Procurement Guide
Specify the subtype, purity (e.g., ≥95% by SDS-PAGE), and activity (units/mg). Research-grade enzymes cost $100–$500/mg, while GMP-grade for therapeutics exceeds $1,000/mg. Suppliers include Sigma-Aldrich, R&D Systems, and Abcam. Validate batch-to-batch consistency with certificates of analysis (CoA). For large-scale orders, request bulk discounts and stability data. Consider recombinant vs. native sources—recombinant cathepsins (e.g., E. coli-expressed) offer higher purity but may lack post-translational modifications.
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