Journal of Photoscience

한국광과학회 (Korean Society of Photoscience)
권호 표지

A Molecular Model for Light Signal Perception and Interdomain Crosstalk in Phytochrome Photoreceptors

  • Song, Pill-Soon (Department of Chemistry, University of Nebraska, Lincoln,Kumho Life&Environemntal Science Laboratory) ;
  • Park, Chung-Mo (Kumho Life & Environemntal Science Laboratory)
  • 발행 : 2000.09.01
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초록

Phytochromes are red and far-red light absorbing photoreceptors for photomorphogenesis in plants. The red/far wavelength reversible biliproteins are made up of two structural domains. The light-perceiving function of the photoreceptor resides in the N-terminal domain, whereas the signal transducing regulatory function is located within the C-terminal domain. The characteristic role of the phytochromes as phtosensory molecular switches is derived from the phototransformation between two distinct spectral forms, the red light absorbing Pr and the far-red light absorbing Pfr forms. The photoinduced Pr Pfr phototransformation accompanies subtle conformational changes throughout the phytochrome molecule. The conformational signals are subsequently transmitted to the C-terminal domain through various inter-domain crosstalks and induce the interaction of the activated C-terminal domain with phytochrome interacting factors. Thus the inter-domain crosstalks play critical roles in the photoactivation of the phytochromes. Posttranslational modifications, such as the phosphorylation of Ser-598, are also involved in this process through conformational changes and by modulating inter-domain signaling.

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