Nagy Ferenc, Schäfer Eberhard
Institute of Plant Biology, Biological Research Center, H-6701 Szeged, Hungary.
Annu Rev Plant Biol. 2002;53:329-55. doi: 10.1146/annurev.arplant.53.100301.135302.
In this review the kinetic properties of both phytochrome A and B measured by in vivo spectroscopy in Arabidopsis are described. Inactivation of phyA is mediated by destruction and that of phyB by fast dark reversion. Recent observations, describing a complex interaction network of various phytochromes and cryptochromes, are also discussed. The review describes recent analysis of light-dependent nuclear translocation of phytochromes and genetic and molecular dissection of phyA- and phyB-mediated signal transduction. After nuclear transport, both phyA- and phyB-mediated signal transduction probably include the formation of light-dependent transcriptional complexes. Although this hypothesis is quite attractive and probably true for some responses, it cannot account for the complex network of phyA-mediated signaling and the interaction with the circadian clock. In addition, the biological function of phytochromes localized in the cytosol remains to be elucidated.
在本综述中，描述了通过体内光谱法在拟南芥中测量的光敏色素A和B的动力学特性。光敏色素A的失活是由破坏介导的，而光敏色素B的失活是由快速暗逆转介导的。还讨论了最近描述各种光敏色素和隐花色素复杂相互作用网络的观察结果。本综述描述了光敏色素光依赖性核转运的最新分析以及光敏色素A和B介导的信号转导的遗传和分子剖析。核转运后，光敏色素A和B介导的信号转导可能都包括光依赖性转录复合物的形成。尽管这一假设颇具吸引力，并且可能对某些反应是正确的，但它无法解释光敏色素A介导的信号传导复杂网络以及与生物钟的相互作用。此外，定位于细胞质中的光敏色素的生物学功能仍有待阐明。
