Summary. Proteasomes, also known as multicatalytic proteinase complexes, were localized in suspension cells of potato (Solanum luberorum) by direct immunofluorescence using polyclonal antibodies labelled with fluorescein isothiocyanate. The method used allows an estimate of relative amounts of proteasomal antigens in different cell components. Proteasomes are present in the nuclei and the cytoplasm. The nucleoplasm contains small areas of weak fluorescence. The peripheral cytoplasm and possibly elements of the cytoskeleton show higher fluorescence than other parts of the cytoplasm. This indicatcs a localization of proteasomes similar to that known from animal cells.
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