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The Synthesis of Ribosomes in E. coli. III. Synthesis of Ribosomal RNA

McCarthy, B. J. and Britten, R. J. and Roberts, R. B. (1962) The Synthesis of Ribosomes in E. coli. III. Synthesis of Ribosomal RNA. Biophysical Journal, 2 (1). pp. 57-82. ISSN 0006-3495. PMCID PMC1366389. doi:10.1016/S0006-3495(62)86841-6.

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Techniques of chromatography on columns of DEAE^1 cellulose and sedimentation analysis through a sucrose gradient have been used to study the flow of C^(14)-uracil label through precursors to completed ribosomes. Analysis by chromatography shows the existence of two sequential precursors constituting together some 10 per cent of the total ribosomal RNA. The chromatographic separation into three fractions is ascribed to the lower protein/RNA ratios of the precursor. By sedimentation the primary precursor (eosome) is identified as a component of average sedimentation coefficient 14S. The second precursor stage (neosome) is divided among at least two particles, one of 43S and the other of about 30S. Detailed kinetic analysis shows that all the radioactivity passes through the eosome on its way to finished 50S and 30S ribosomes. The delay in the entry of radioactivity to ribosomes is that expected from the quantity of eosome precursor. The obvious conclusion that there exists a precursor-product relationship is discussed together with possible interpretations.

Item Type:Article
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Additional Information:© 1962 Biophysical Society. Received for publication, August 22, 1961.
Issue or Number:1
PubMed Central ID:PMC1366389
Record Number:CaltechAUTHORS:20160727-133214333
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Official Citation:McCarthy, B. J., Britten, R. J., & Roberts, R. B. (1962). The Synthesis of Ribosomes in E. coli: III. Synthesis of Ribosomal RNA. Biophysical Journal, 2(1), 57–82.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69252
Deposited By: Ruth Sustaita
Deposited On:27 Jul 2016 20:53
Last Modified:11 Nov 2021 04:11

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