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- W2004818166 abstract "In the translational termination step of protein synthesis the three termination codons UAA, UAG or UGA are recognized by so-called release or termination factors. The release factor RF-1 interacts with UAG and UAA whereas RF-2 is specific for UGA and UAA. Two mechanisms concerning the termination event have been discussed so far: recognition of the termination codon by the protein in a tRNA-like manner or double-strand formation between the codon and the 3' end of the 16S rRNA which is stabilized by the termination factor. Using equilibrium dialysis we show that 40% of the ribosomes can bind UGAA in an RF-2-dependent manner. The stability with the correct combination RF-2-UGA is tenfold higher as compared to the wrong termination codon UAG. We confirm prior findings that the termination factor RF-2 is bound to the A-site of the ribosome. In addition to the ribosomal proteins L2, L10, L7/L12 and L20 of the large subunit and S6 and S18 of the small subunit, the 16S rRNA became labelled when radioactive UGA was crosslinked to the ribosome in the presence of RF-2. Our data support a mechanism of termination in which a double strand between the termination codon and the 3' end of the 16S rRNA is formed as the starting event. The resulting RNA-RNA double strand in turn may be recognized and stabilized by the termination factor." @default.
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- W2004818166 date "1989-04-01" @default.
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- W2004818166 title "On the role of the termination factor RF-2 and the 16S RNA in protein synthesis" @default.
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- W2004818166 doi "https://doi.org/10.1111/j.1432-1033.1989.tb14680.x" @default.
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