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Plant Physiology 53:543-554 (1974)
© 1974 American Society of Plant Biologists

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Articles

The Chloroplast and Cytoplasmic Ribosomes of Euglena

II. Characterization of Ribosomal Proteins 1

Georges Freyssinet2 and Jerome A. Schiff

a Department of Biology, Brandeis University, Waltham, Massachusetts 02154

Cytoplasmic and chloroplast ribosomal proteins were isolated from Euglena gracilis and analyzed on polyacrylamide gels. Cytoplasmic ribosomes appear to contain 75 to 100 proteins ranging in molecular weight from 10,200 to 104,000, while chloroplast ribosomes appear to contain 35 to 42 proteins with molecular weights ranging from 9,700 to 57,900. This indicates that the cytoplasmic ribosomes are similar in composition to other eucaryotic ribosomes, while chloroplast ribosomes have a protein composition similar to the 70S procaryotic ribosome. The kinetics of light-induced labeling of cytoplasmic ribosomal proteins during chloroplast development has been determined, and the results are compared with the kinetics of ribosomal RNA synthesis.

2 Postdoctoral research associate, Brandeis University; supported during a portion of this work by a fellowship from North Atlantic Treaty Organization. Present address: Section Biologie Générale et Appliquée, Université Lyon I, 69 Villeurbanne, France.

1 This work was supported by Grant GM 14595 from the National Institutes of Health.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1974 by the American Society of Plant Biologists