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. 1990 Mar 25;18(6):1565–1569. doi: 10.1093/nar/18.6.1565

Role of GC-biased mutation pressure on synonymous codon choice in Micrococcus luteus, a bacterium with a high genomic GC-content.

T Ohama 1, A Muto 1, S Osawa 1
PMCID: PMC330526  PMID: 2326195

Abstract

The GC (G + C, or G or C)-contents of codon silent positions in all two-codon sets and three codons AUY/A (IIe), and in most of the family boxes of Micrococcus luteus (genomic GC-content: 74%) are 95% to 100% in both the highly and weakly expressed genes. In some family boxes, there is a decrease in NNC codons and an increase in NNG codons from the highly expressed to weakly expressed genes without apparent involvement of NNU and NNA codons. From these observations, we conclude that the selective use of synonymous codons in M. luteus may be largely determined by GC-biased mutation pressure and that in the highly expressed genes tRNAs would act as a weak selection pressure in some family boxes. Available data suggest that the effect of selection pressure by tRNAs on the synonymous codon choice becomes more apparent in the highly expressed genes in eubacteria with intermediate GC-contents such as Escherichia coli and Bacillus subtilis, and that the U/C ratio of the codon third positions in NNU/C-type two-codon sets in the weakly expressed genes would represent the approximate magnitude of directional mutation pressure throughout eubacteria.

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Selected References

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