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首页> 外文期刊>Journal of Experimental Botany >Functional characterization of the three genes encoding 1-deoxy-D-xylulose 5-phosphate synthase in maize
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Functional characterization of the three genes encoding 1-deoxy-D-xylulose 5-phosphate synthase in maize

机译：玉米中编码1-脱氧-D-木酮糖5-磷酸合酶的三个基因的功能表征

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摘要

The 1-deoxy-D-xylulose 5-phosphate synthase (DXS) enzyme catalyses the first biosynthetic step of the 2-C-methyl-D-erythritol 4-phosphate (MEP) pathway. In plants the MEP pathway is involved in the synthesis of the common precursors to the plastidic isoprenoids, isopentenyl diphosphate and dimethylallyl diphosphate, in plastids. DXS is recognized as limiting this pathway and is a potential target for manipulation to increase various isoprenoids such as carotenoids. In Zea mays three dxs genes exist that encode plastid-targeted functional enzymes. Evidence is provided that these genes represent phylogenetically distinctive clades conserved among plants preceding monocot–dicot divergence. There is differential accumulation for each dxs gene transcript, during development and in response to external signals such as light. At the protein level, the analysis demonstrates that in Z. mays, DXS protein is feedback regulated in response to the inhibition of the pathway flow. The results support that the multilevel regulation of DXS activity is conserved in evolution.
机译：1-脱氧-D-木酮糖5-磷酸合酶（DXS）酶催化2-C-甲基-D-赤藓糖醇4-磷酸（MEP）途径的第一个生物合成步骤。在植物中，MEP途径参与质体中质体类异戊二烯的共同前体即异戊烯基二磷酸酯和二甲基烯丙基二磷酸酯的合成。 DXS被认为是限制该途径的途径，并且是操纵增加各种类异戊二烯（如类胡萝卜素）的潜在目标。在玉米中，存在三个编码质体靶向功能酶的dxs基因。有证据表明，这些基因代表了在单子叶植物-双子叶植物发散之前在植物中保存的系统发育独特的进化枝。在发育过程中以及响应外部信号（例如光）时，每个dxs基因转录物都有差异积累。在蛋白质水平上，分析表明，在玉米（Z. mays）中，DXS蛋白质响应通路流动的抑制而受到反馈调节。结果支持在进化中保持DXS活性的多级调节。

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