A Cyanobacterial Phytochrome Two-Component Light Sensory System

TitleA Cyanobacterial Phytochrome Two-Component Light Sensory System
Publication TypeJournal Article
Year of Publication1997
AuthorsYeh, K-C., Wu S-H., Murphy J. T., & Lagarias C. J.
Refereed DesignationRefereed
Pagination1505 - 1508

The biliprotein phytochrome regulates plant growth and developmental responses to the ambient light environment through an unknown mechanism. Biochemical analyses demonstrate that phytochrome is an ancient molecule that evolved from a more compact light sensor in cyanobacteria. The cyanobacterial phytochrome Cph1 is a light-regulated histidine kinase that mediates red, far-red reversible phosphorylation of a small response regulator, Rcp1 (response regulator for cyanobacterial phytochrome), encoded by the adjacent gene, thus implicating protein phosphorylation-dephosphorylation in the initial step of light signal transduction by phytochrome.