catalytic activity:Hydrolysis of proteins with broad specificity for peptide bonds. Preferentially cleaves -Arg-Arg-|-Xaa bonds in small molecule substrates (thus differing from cathepsin L) . In addition to being an endopeptidase , shows peptidyl-dipeptidase activity , liberating C-terminal dipeptides. ,function:Thiol protease which is believed to participate in intracellular degradation and turnover of proteins. Has also been implicated in tumor invasion and metastasis. ,similarity:Belongs to the peptidase C1 family. ,subcellular location:Identified by mass spectrometry in melanosome fractions from stage I to stage IV. ,subunit:Dimer of a heavy chain and a light chain cross-linked by a disulfide bond. ,
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