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Cloning and characterization of the low-affinity cyclic AMP phosphodiesterase gene of Saccharomyces cerevisiae.

机译:酿酒酵母的低亲和力环状AMP磷酸二酯酶基因的克隆和鉴定。

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Saccharomyces cerevisiae contains two genes which encode cyclic AMP (cAMP) phosphodiesterase. We previously isolated and characterized PDE2, which encodes a high-affinity cAMP phosphodiesterase. We have now isolated the PDE1 gene of S. cerevisiae, which encodes a low-affinity cAMP phosphodiesterase. These two genes represent highly divergent branches in the evolution of phosphodiesterases. High-copy-number plasmids containing either PDE1 or PDE2 can reverse the growth arrest defects of yeast cells carrying the RAS2(Val-19) mutation. PDE1 and PDE2 appear to account for the aggregate cAMP phosphodiesterase activity of S. cerevisiae. Disruption of both PDE genes results in a phenotype which resembles that induced by the RAS2(Val-19) mutation. pde1- pde2- ras1- ras2- cells are viable.
机译:酿酒酵母包含两个编码环状AMP(cAMP)磷酸二酯酶的基因。我们先前分离并鉴定了PDE2,它编码高亲和力的cAMP磷酸二酯酶。现在,我们已经分离出酿酒酵母的PDE1基因,该基因编码低亲和力的cAMP磷酸二酯酶。这两个基因代表磷酸二酯酶进化中的高度分歧分支。包含PDE1或PDE2的高拷贝数质粒可以逆转带有RAS2(Val-19)突变的酵母细胞的生长停滞缺陷。 PDE1和PDE2似乎解释了酿酒酵母的总cAMP磷酸二酯酶活性。两种PDE基因的破坏都会产生类似于RAS2(Val-19)突变诱导的表型。 pde1- pde2- ras1- ras2-细胞是可行的。

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