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• W2034900623 abstract "A method was developed for the isolation of unmodified lysosomes of human origin using cultured EB-virus transformed lymphoblasts. The cells were lysed carefully by repeated resuspension in buffered isotonic sucrose. A crude granular fraction derived from this lysate was further purified by isopyknic centrifugation in an isotonic colloidal silica gel gradient and by free-flow electrophoresis. The following relative specific activities (mean ± S.D.) of lysosomal marker enzymes were measured in a pooled lysosomal fraction obtained from the final electrophoresis step (representing less than 0.1% of the initial protein): β-N-acetylglucosaminidase 85.6 ± 15.5; β-galactosidase 87.6 ± 13.4; acid β-glycerophosphatase 41.7 ± 3.5; β-glucuronidase 36.6 ± 6.1. With respect to the final two enzymes the recovery within this pooled fraction was 5–6% of the initial lysate. The great differences in relative specific activities achievable may be due mainly to different extralysosomal portions of the lysosomal marker enzymes, as was found for acid β-glycerophosphatase which was largely distributed within non-lysosomal structures in lymphoblasts when studied by histochemical staining. The final fraction consisted almost exclusively of lysosomes when examined by electron microscopy. Most lysosomes appeared club-shaped immediately after cell lysis and throughout the preparation procedure. Examination by electron microscopy and measurement of the latency of lysosomal enzyme activity revealed an exceptional integrity of the lysosomal membrane. This method provides the opportunity to study highly purified lysosomes from patients with lysosomal disorders." @default.
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• W2034900623 date "1981-02-01" @default.
• W2034900623 modified "2023-09-25" @default.
• W2034900623 title "Purification and characterization of human lysosomes from EB-virus transformed lymphoblasts" @default.
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• W2034900623 doi "https://doi.org/10.1016/0014-4827(81)90230-5" @default.
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