Abstract
THE termination of protein synthesis in ribosomes is governed by termination (stop) codons in messenger RNAs and by polypeptide chain release factors (RFs). Although the primary structure of prokaryotic RFs and yeast mitochrondrial RF is established1–4, that of the only known eukaryotic RF (eRF)5 remains obscure. Here we report the assignment of a family of tightly related proteins (designated eRFl) from lower and higher eukaryotes which are structurally and functionally similar to rabbit eRF. Two of these proteins, one from human6 and the other from Xenopus laevis7 , have been expressed in yeast and Escherichia coli, respectively, purified and shown to be active in the in vitro RF assay. The other protein of this family, sup45 (supl) of Saccharomyces cerevisiae, is involved in omnipotent suppression during translation8–12. The amino-acid sequence of the eRFl family is highly conserved. We conclude that the eRFl proteins are directly implicated in the termination of translation in eukaryotes.
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Frolova, L., Le Goff, X., Rasmussen, H. et al. A highly conserved eukaryotic protein family possessing properties of polypeptide chain release factor. Nature 372, 701–703 (1994). https://doi.org/10.1038/372701a0
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DOI: https://doi.org/10.1038/372701a0
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