(A) Fed ratliverlysosomes were incubated in an isotonic buffer without additions, or in the presence of ratlivercytosol (25 μg), glyceraldehyde‐3‐phosphate dehydrogenase (GAPDH) (25 μg), GST‐hsc70 (10 μg/ml), ATP (5 mM) or the indicated combinations for 15 min at 37°C. Lysosomes incubated directly with apyrase or with cytosol treated with apyrase are shown in the right bottom panel. At the end of the incubation, lysosomes were subjected to Triton X‐114 extraction, apyrase density gradient centrifugation and immunoblot as in Figure 2C. Graph shows changes in LAMP‐2A distribution expressed as times the value in untreated lysosomes and are the mean of the densitometric quantification of 3-6 experiments as the one shown here. Because all the incubations were performed in the presence of protease inhibitors, total levels of LAMP‐2A in lysosomes remained constant throughout the incubation. 