Genetic evidence that Arabidopsis ALTERED ROOT ARCHITECTURE encodes a putative dehydrogenase involved in homoserine biosynthesis

Genetic evidence that Arabidopsis ALTERED ROOT ARCHITECTURE encodes a putative dehydrogenase involved in homoserine biosynthesis
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拟南芥改变根结构编码参与高丝氨酸生物合成的推定脱氢酶的遗传证据

DOI:
10.1007/s00299-013-1509-z
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发表时间:
2013
期刊:
影响因子:
6.2
通讯作者:
Liu, Dong
Liu, Dong
中科院分区:
生物学2区
文献类型:
--
作者:
Yuan, Hui;Liu, Dong

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拟南芥根发育突变体的遗传和分子分析确定了一个假定的脱氢酶基因参与高丝氨酸生物合成。在高等植物中,高丝氨酸(Hse)来源于天冬氨酸(Asp),并且是生产甲硫氨酸(Met)、苏氨酸(Thr)和异亮氨酸(Ile)的重要中间体。在拟南芥中,六个酶参与的Hse从天冬氨酸的生物合成已得到很好的表征。然而,尚不清楚是否存在参与该过程的其他酶。在这项工作中,我们的特点是拟南芥突变体,ara(改变根结构),与短主根和侧根数量增加。遗传和分子生物学分析表明ARA基因编码一个具有D-异构体特异性2-羟酸脱氢酶结构域的蛋白。ARA在所有植物器官中表达,并定位于细胞外周。ara突变体表型可以通过外源施用Hse、Met、Ile和2-氧代丁酸来拯救。基于以上结果,我们推测ARA蛋白可能是一种参与高丝氨酸生物合成的脱氢酶。
Genetic and molecular analysis of an Arabidopsis root development mutant identified a putative dehydrogenase gene involved in homoserine biosynthesis. In higher plants, homoserine (Hse) is derived from aspartate (Asp) and is an important intermediate for production of methionine (Met), threonine (Thr), and isoleucine (Ile). In Arabidopsis, six enzymes involved in the biosynthesis of Hse from Asp have been well characterized. It is not known, however, whether there exist other enzymes involved in this process. In this work, we characterized an Arabidopsis mutant, ara (altered root architecture), with a short primary root and an increased number of lateral roots. Genetic and molecular analysis indicated that the ARA gene encodes a protein with a D-isomer specific 2-hydroxyacid dehydrogenase domain. ARA is expressed in all plant organs and is localized in the cell periphery. The ara mutant phenotypes can be rescued by exogenously applied Hse, Met, Ile and 2-oxobutanoate. Based on the results presented here, we propose that the ARA protein may be a dehydrogenase involved in homoserine biosynthesis.
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