D so far. Utilizing the pseudosubstrates, we determined an apparent pH optimum of 4.six for ARSK activity, which strongly suggested a lysosomal localization. This was confirmed by immunofluorescence studies demonstrating colocalization of ARSK using the lysosomal integral membrane protein LAMP-1 upon uptake of partially purified ARSK supplemented to the cell culturemedium. Most lysosomal hydrolases are …
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