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Translation is increasingly recognized as a central control layer of gene expression in eukaryotic cells. The overall organization of mRNA and ribosomes within polysomes, as well as the possible role of this organization in translation are poorly understood. Here we show that polysomes are primarily formed by three distinct classes of ribosome assemblies. We observe that these assemblies can be connected by naked RNA regions of the transcript. We show that the relative proportions of the three classes of ribosome assemblies reflect, and probably dictate, the level of translational activity. These results reveal the existence of recurrent supra-ribosomal building blocks forming polysomes and suggest the presence of unexplored translational controls embedded in the polysome structure.

Original publication

DOI

10.1083/jcb.201406040

Type

Journal article

Journal

J Cell Biol

Publication Date

02/03/2015

Volume

208

Pages

581 - 596

Keywords

Cell Line, Tumor, Humans, Polyribosomes, Protein Biosynthesis, RNA, Messenger