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(a) The purified 20S (1.5 μg) and 26S (5.0 μg) proteasomes were subjected to polyacrylamide gel electrophoresis and further stained with Coomassie blue R250. Subunits of the 19S regulatory particle and the molecular weight marker are indicated. (b,c) The activity of 20S and 26S proteasomes was analyzed by native PAGE further saturated with Suc-LLVY-AMC (b) or measured in the presence or absence of 0.02% SDS and the proteasome inhibitor MG132 (c).
