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The Journal of Cell Biology, Vol 46, 576-591, Copyright © 1970 by Rockefeller University Press

ARTICLE

A NEW METHOD FOR THE PREPARATION OF RAT LIVER LYSOSOMES : Separation of Cell Organelles of Rat Liver by Carrier-Free Continuous Electrophoresis



R. Stahn 1, K.-P. Maier 1, and K. Hannig 1

1 From the Max-Planck-Institut für Eiweiss und Lederforschung, 8 München, West Germany.

Dr. Maier's present address is Medizinische Universitäts-Klinik, 78 Freiburg, West Germany

A combination of differential centrifugation and carrier-free continuous electrophoresis is introduced as a new method for the isolation of animal cell organelles. Various buffers were systematically checked in order to find the system which preserves the organelles and gives as well a good separation in the free-flow electrophoresis apparatus. Triethanolamine-acetate buffer (10 mM), pH 7.4 was used. The isolated lysosomes were pure according to marker enzymes and electron micrographs. A heterogeneity of the lysosomes in electrophoretic mobility was demonstrated with respect to the marker enzymes arylsulfatase and ß-glucuronidase. The lysosomes with higher mobility showed a maximum enrichment of 240-fold with respect to arylsulfatase. The lysosomes with lower electrophoretic mobility showed a 65-fold enrichment with respect to ß-glucuronidase. The ratio of ß-glucuronidase to arylsulfatase varied from 2:1 to 1:2 in lysosomes of different mobility. The yield amounted to approximately 1 mg of lysosomal protein per gram of liver protein. 5–8 mg of lysosomes can be obtained in one experiment. The electrophoretic separation proves to be an effective tool in obtaining pure and well preserved lysosomes.

Submitted on May 1, 1969
Revised on March 31, 1970


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