PMID: 2511323Oct 5, 1989Paper

Codon contexts from weakly expressed genes reduce expression in vivo

Journal of Molecular Biology
L S Folley, M Yarus

Abstract

Nucleotides that neighbor codons in Escherichia coli genes are highly non-random. Furthermore, these context biases are stronger and extend farther from the codon in weakly expressed than in highly expressed genes. We therefore suggested that codon contexts are selected to reduce gene expression levels. We now compare the expression levels of lacZ genes containing two specific coding sequences (context inserts). One context insert represents contexts seen in weakly expressed genes (low variant); the other represents contexts seen in highly expressed genes (high variant). The two variants have identical nucleotide and codon compositions, and encode the same protein. A permutation of four nucleotides, which changes eight codon:codon interfaces of 1043, comprises the only difference between the high and low context variant genes. In three different lacZ mRNAs, the low variant was expressed at a level significantly below that of the high variant. This context effect depends entirely on translation of the contexts in the correct frame; its magnitude depends in part on the placement of other features (e.g. transcriptional pauses and terminators, or perhaps other slow codons or contexts) in the mRNAs. Changing the ribosome density on ...Continue Reading

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