Fitokrom: Perbedaan antara revisi

 

The P_fr state passes on a signal to other biological systems in the cell, such as the mechanisms responsible for [[gene]] expression. Although this mechanism is almost certainly a [[biochemical]] process, it is still the subject of much debate. It is known that although phytochromes are synthesized in the [[cytosol]] and the P_r form is localized there, the P_fr form, when generated by light illumination, is translocated to the [[cell nucleus]]. This implies a role of phytochrome in controlling gene expression, and many genes are known to be regulated by phytochrome, but the exact mechanism has still to be fully discovered. It has been proposed that phytochrome, in the P_fr form, may act as a [[kinase]], and it has been demonstrated that phytochrome in the P_fr form can interact directly with [[transcription factor]]s.