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Two duplicated genes DDI2 and DDI3 in budding yeast encode a cyanamide hydratase and are induced by cyanamide.

J Biol Chem. 2015 May 15;290(20):12664-75. Epub 2015 Apr 06
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摘要


Two DNA damage-inducible genes in Saccharomyces cerevisiae, DDI2 and DDI3, are identical and encode putative HD domain-containing proteins, whose functions are currently unknown. Because Ddi2/3 also shows limited homology to a fungal cyanamide hydratase that converts cyanamide to urea, we tested the enzymatic activity of recombinant Ddi2. To this end, we developed a novel enzymatic assay and determined that the Km value of the recombinant Ddi2/3 for cyanamide is 17.3 ± 0.05 mm, and its activity requires conserved residues in the HD domain. Unlike most other DNA damage-inducible genes, DDI2/3 is only induced by a specific set of alkylating agents and surprisingly is strongly induced by cyanamide. To characterize the biological function of DDI2/3, we sequentially deleted both DDI genes and found that the double mutant was unable to metabolize cyanamide and became much more sensitive to growth inhibition by cyanamide, suggesting that the DDI2/3 genes protect host cells from cyanamide toxicity. Despite the physiological relevance of the cyanamide induction, DDI2/3 is not involved in its own transcriptional regulation. The significance of cyanamide hydratase activity and its induced expression is discussed.

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