TURNOVER OF HELA RIBOSOMAL RNA
Open Access
- 1 September 1971
- journal article
- Published by Rockefeller University Press in The Journal of cell biology
- Vol. 50 (3) , 787-794
- https://doi.org/10.1083/jcb.50.3.787
Abstract
A class of RNA in HeLa cytoplasm with a sedimentation value of 22S is described. This RNA is a true cytoplasmic component and is not an artifact of cell rupture or of the method of RNA preparation. The 22S RNA sediments in a sucrose gradient with those ribosomal structures containing 28S ribosomal RNA (60S and 74S particles and polyribosomes). It has a base composition and methyl content similar to those of 28S RNA. The kinetics of formation of 22S suggest that it is not a direct product of transcription but is derived in vivo from "old" molecules of 28S RNA.Keywords
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