One of nature's mysteries is how plants survive impact by the huge amounts of energy contained in the sun's rays, while using this energy for photosynthesis. The hypothesis is that the light-absorbing proteins in the plant's blades quickly dissipate the energy throughout the entire protein molecule through so-called protein quakes. Researchers at DTU Physics have now managed to successfully 'film' this process.
Both plants, algae and bacteria contain light-absorbing proteins which play a role in photosynthesis and thus how the organisms produce energy. However, it has long been a mystery how the organisms survive the sun's powerful rays while at the same time harvesting solar energy.
The hypothesis is that the light-absorbing proteins in the plants' blades quickly dissipate the energy throughout the entire protein molecule through quakes. Researchers at DTU Physics have now managed to successfully confirm the hypothesis.
Together with researchers from Stanford University, Tim Brandt van Driel and Kasper Skov Kjær from DTU Physics have investigated the dynamics of a protein from a bacterial photosynthesis when exposed to sunlight[SFK1] . Using a free electron laser that sends impulses lasting less than a femtosecond (0.000000000000001 sec. /10-15 sec.), the researchers have successfully filmed the so-called protein quakes which so far have just been a theoretical explanation of how the proteins survive the solar energy bombardment.
During a protein quake, the protein structure, evenly and harmlessly distributes the solar energy across the entire protein.
In addition to confirming the hypothesis about the proteins' survival strategy, the experiment is also part of the method development for examining light absorption by photosynthesis proteins and electron transfers, which are again relevant for utilising solar energy in, for example, solar cells and other light-absorption systems.
- David Arnlund, Linda C Johansson, Cecilia Wickstrand, Anton Barty, Garth J Williams, Erik Malmerberg, Jan Davidsson, Despina Milathianaki, Daniel P DePonte, Robert L Shoeman, Dingjie Wang, Daniel James, Gergely Katona, Sebastian Westenhoff, Thomas A White, Andrew Aquila, Sadia Bari, Peter Berntsen, Mike Bogan, Tim Brandt van Driel, R Bruce Doak, Kasper Skov Kjær, Matthias Frank, Raimund Fromme, Ingo Grotjohann, Robert Henning, Mark S Hunter, Richard A Kirian, Irina Kosheleva, Christopher Kupitz, Mengning Liang, Andrew V Martin, Martin Meedom Nielsen, Marc Messerschmidt, M Marvin Seibert, Jennie Sjöhamn, Francesco Stellato, Uwe Weierstall, Nadia A Zatsepin, John C H Spence, Petra Fromme, Ilme Schlichting, Sébastien Boutet, Gerrit Groenhof, Henry N Chapman, Richard Neutze. Visualizing a protein quake with time-resolved X-ray scattering at a free-electron laser. Nature Methods, 2014; DOI: 10.1038/nmeth.3067
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