Abstract
The intervening sequence (IVS) of the Tetrahymena ribosomal RNA precursor is excised as a linear RNA molecule which subsequently cyclizes itself in a protein-independent reaction. Cyclization involves cleavage of the linear IVS RNA 15 nucleotides from its 5′ end and formation of a phosphodiester bond between the new 5′ phosphate and the original 3′-hydroxyl terminus of the IVS. This recombination mechanism is analogous to that by which splicing of the precursor RNA is achieved. The circular molecules appear to have no direct function in RNA splicing, and we propose the cyclization serves to prevent unwanted RNA from driving the splicing reactions backwards.
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Zaug, A., Grabowski, P. & Cech, T. Autocatalytic cyclization of an excised intervening sequence RNA is a cleavage–ligation reaction. Nature 301, 578–583 (1983). https://doi.org/10.1038/301578a0
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DOI: https://doi.org/10.1038/301578a0
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