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Yeast. 1999 Jun 15;15(8):633-7.

The positive relationship between codon usage bias and translation initiation AUG context in Saccharomyces cerevisiae.

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Kansai Electric Power Co., Environmental Research Center, Hyogo, Japan.


The relationship between the codon usage bias and the sequence context surrounding the AUG translation initiation codon was examined in 211 Saccharomyces cerevisiae mRNA sequences. The codon usage bias and the number of matches to optimal AUG context, (A/U)A(A/C)AA(A/C)AUGUC(U/C), for translation initiation showed a positive relationship, indicating that these two factors are evolutionally under the similar natural selection constraint at the translation level. A new index (AUGCAI = AUG Context Adaptation Index) for the measure of optimal AUG context was devised, and the importance of each position of AUG context was also examined.

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