U.S. Department of Energy Office of Biological and Environmental Research

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Understanding How Plants Sense Ultraviolet Light
Published: February 09, 2012
Posted: May 30, 2012

Sunlight is essential for plant development and growth, yet many details of the mechanisms by which plants respond to sunlight are poorly understood. A recent study published in Science provides new information about the molecular changes initiated by exposure to the UV-B portion of sunlight. The research used small-angle x-ray scattering (SAXS) experiments to characterize how the plant photoreceptor UVR8 changes shape when exposed to UV-B radiation. Two UVR8 molecules are complexed together as a dimer in plant cells and break apart on exposure to UV-B. The separate molecules then interact with a series of proteins in the cell to signal the presence of solar radiation. A specific mutation in UVR8 was found to "retune" the molecule's response from UV-B to UV-C radiation. The results will be useful in understanding how to optimize biomass crop growth. The SAXS studies were carried out at the SIBYLS experimental station at the Advanced Light Source at the Berkeley Lab. The study was led by Elizabeth Getzoff of the Scripps Research Institute.

Reference: Christie, J. M., et al. 2012. "Plant UVR8 Photoreceptor Senses UV-B by Tryptophan-Mediated Disruption of Cross-Dimer Salt Bridges," Science 335, 1492&ndash96. DOI: 10.1126/science.1218091. (Reference link)

Contact: Roland F. Hirsch, SC-23.2, (301) 903-9009
Topic Areas:

  • Research Area: Sustainable Biofuels and Bioproducts
  • Research Area: Structural Biology, Biomolecular Characterization and Imaging
  • Research Area: Structural Biology Infrastructure

Division: SC-23.2 Biological Systems Science Division, BER

 

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