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Termination efficiency of a mutant form of RF (release facor) 1, as compared to the wild-type enzyme, is influenced by the P-site peptidyl-tRNA if the termination signal is UAGA. This effect is weaker at the stronger termination signal UAGU. Similarly, low efficiency of the mutant RF1, together with certain peptidyl-tRNAs, can be increased by changing the second base of the 3'-flanking codon from...
The glycine codons GGA or GGG, on the 5′ side of stop codons UAG and UGA, are associated with a uniquely low termination efficiency in Escherichia coli, as compared to other codons, including the two glycine codons GGU and GGC. In contrast to the wild-type strain, all four glycine codons have a similar effect on termination at UAG in a strain with a mutant release factor 1 (RF1). Thus, these two glycine...
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