THE 3' UNTRANSLATED REGION OF A RICE ALPHA-AMYLASE GENE FUNCTIONS AS A SUGAR-DEPENDENT MESSENGER-RNA STABILITY DETERMINANT

In plants, sugar feedback regulation provides a mechanism for control of carbohydrate allocation and utilization among tissues and organs. T he sugar repression of alpha-amylase gene expression in rice provides an ideal model for studying the mechanism of sugar feedback regulation . We have shown previously that sugar repression of alpha-amylase gene expression in rice suspension cells involves control of both transcri ption rate and mRNA stability. The alpha-amylase mRNA is significantly more stable in sucrose-starved cells than in sucrose-provided cells. To elucidate the mechanism of sugar-dependent mRNA turnover, we have e xamined the effect of alpha Amy3 3' untranslated region (UTR) on mRNA stability by functional analyses in transformed rice suspension cells. We found that the entire alpha Amy3 3' UTR and two of its subdomains can independently mediate sugar-dependent repression of reporter mRNA accumulation. Analysis of reporter mRNA half-lives demonstrated that t he entire alpha Amy3 3' UTR and the two subdomains each functioned as a sugar-dependent destabilizing determinant in the turnover of mRNA. N uclear run-on transcription analysis further confirmed that the alpha Amy3 3' UTR and the two subdomains did not affect the transcription ra te of promoter. The identification of sequence elements in the alpha-a mylase mRNA that dictate the differential stability has very important implications for the study of sugar-dependent mRNA decay mechanisms.