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The Photoconversion of Phytochrome Includes an Unproductive Shunt Reaction Pathway
Citation key Buhrke2018
Author Buhrke, David and Kuhlmann, Uwe and Michael, Norbert and Hildebrandt, Peter
Pages 566-570
Year 2018
DOI 10.1002/cphc.201701311
Journal ChemPhysChem
Volume 19
Number 5
Abstract Abstract Phytochromes are modular bimodal photoswitches that control gene expression for morphogenetic processes in plants. These functions are triggered by photoinduced conversions between the inactive and active states of the photosensory module, denoted as Pr and Pfr, respectively. In the present time-resolved resonance Raman spectroscopic study of bacterial representatives of this photoreceptor family, we demonstrate that these phototransformations do not represent linear processes but include a branching reaction back to the initial state, prior to (de)activation of the output module. Thus, only a fraction of the photoreceptors undergoing the phototransformations can initiate the downstream signaling process, consistent with phytochrome's function as a sensor for more durable changes of light conditions.
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