Verslues Paul E, Zhu Jian-Kang
Institute for Integrative Genome Biology and Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA.
Curr Opin Plant Biol. 2007 Oct;10(5):447-52. doi: 10.1016/j.pbi.2007.08.004. Epub 2007 Sep 17.
Abscisic acid is a powerful signaling molecule that accumulates in response to abiotic stress. However, no potential receptors that could perceive this increase in abscisic acid had been identified until recent reports of three abscisic acid binding proteins: the nuclear protein Flowering Time Control Locus A, the chloroplast protein Magnesium Protoporphyrin-IX Chelatase H subunit, and the membrane-associated protein G Protein Coupled Receptor 2. Abscisic acid metabolism also has a new and prominent component with the identification of a beta-glucosidase capable of releasing biologically active abscisic acid from inactive abscisic acid-glucose ester in a stress-inducible manner. These observations refocus our attention on the metabolism underlying abscisic acid accumulation, sites of abscisic acid perception, and delivery of abscisic acid to those sites.
脱落酸是一种强大的信号分子，在非生物胁迫下会积累。然而，直到最近报道了三种脱落酸结合蛋白，才鉴定出可能感知脱落酸这种增加的潜在受体：核蛋白开花时间控制位点A、叶绿体蛋白镁原卟啉-IX螯合酶H亚基和膜相关蛋白G蛋白偶联受体2。随着一种能够以胁迫诱导方式从无活性的脱落酸-葡萄糖酯中释放出生物活性脱落酸的β-葡萄糖苷酶的鉴定，脱落酸代谢也有了一个新的突出组成部分。这些观察结果将我们的注意力重新集中在脱落酸积累的代谢基础、脱落酸感知位点以及脱落酸向这些位点的传递上。
