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Background: The lysosomal cysteine proteases of the papain family are some of the best studied proteolytic enzymes. Small-molecule inhibitors and fluorogenic substrate mimics have been used to probe the physiological roles of these proteases. A high degree of homology between family members and overlap in substrate specificity have made elucidating individual protease function, expression and activity...
Background: The proteasome is a multicatalytic protease complex responsible for most cytosolic protein breakdown. The complex has several distinct proteolytic activities that are defined by the preference of each for the carboxyterminal (P1) amino acid residue. Although mutational studies in yeast have begun to define substrate specificities of individual catalytically active β subunits, little is...
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