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. 1996 Apr 1;15(7):1696–1704.

Structure of the C-terminal end of the nascent peptide influences translation termination.

A Björnsson 1, S Mottagui-Tabar 1, L A Isaksson 1
PMCID: PMC450081  PMID: 8612594

Abstract

The efficiency of translation termination at NNN NNN UGA A stop codon contexts has been determined in Escherichia coli. No general effects are found which can be attributed directly to the mRNA sequences itself. Instead, termination is influenced primarily by the amino acids at the C-terminal end of the nascent peptide, which are specified by the two codons at the 5' side of UGA. For the penultimate amino acid (-2 location), charge and hydrophobicity are important. For the last amino acid (-1 location), alpha-helical, beta-strand and reverse turn propensities are determining factors. The van der Waals volume of the last amino acid can affect the relative efficiency of stop codon readthrough by the wild-type and suppressor forms of tRNA(Trp) (CAA). The influence of the -1 and -2 amino acids is cooperative. Accumulation of an mRNA degradation intermediate indicates mRNA protection by pausing ribosomes at contexts which give inefficient UGA termination. Highly expressed E.coli genes with the UGA A termination signal encode C-terminal amino acids which favour efficient termination. This restriction is not found for poorly expressed genes.

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