PMID: 639809Apr 1, 1978Paper

Characterization of proteins from nucleolar preribosomes of mouse leukemia cells by two-dimensional polyacrylamide gel electrophoresis

European Journal of Biochemistry
M A Auger-Buendia, M Longuet

Abstract

Proteins of isolated 80-S and 60-S nucleolar preribosomal particles were characterized by means of two-dimensional polyacrylamide gel electrophoresis, in the lymphocytic mouse leukemia cells L5178Y. Their identification and metabolic relationships with ribosomal subunit proteins were investigated using co-electrophoresis of unlabeled polysomal proteins with labeled proteins of either nucleolar preribosomes or ribosomal subunits. The large and small ribosomal subunits contain 40 and 31 proteins, respectively. The nucleolar 80-S preribosomes were analysed after 2 and 5 h of incubation with tritiated valine and leucine and were shown to contain about 55 proteins. Most of them were identical to cytoplasmic ribosomal subunit proteins. The nucleolar 60-S preribosomes contain all the proteins which are common to 80-S preribosomes and large ribosomal subunits, and one additional protein (L10). The ribosomal proteins which were absent from nucleolar particles were found to be labeled in the cytoplasmic ribosomes after the same incubation period. Thus, in addition to the association of the bulk of ribosomal proteins with 45-S RNA within the 80-S preribosomes, results indicate that a group of ribosomal proteins and particularly from the s...Continue Reading

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Jul 29, 1988·Clinica Chimica Acta; International Journal of Clinical Chemistry·O OdaN Yamanaka
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