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Postcards from the photosynthetic edge
Date:7/9/2014

A crucial piece of the puzzle behind nature's ability to split the water molecule during photosynthesis that could help advance the development of artificial photosynthesis for clean, green and renewable energy has been provided by an international collaboration of scientists led by researchers with the Lawrence Berkeley National Laboratory (Berkeley Lab) and the SLAC National Accelerator Laboratory.

Working at SLAC's Linac Coherent Light Source (LCLS), the world's most powerful x-ray laser, the researchers were able to take detailed "snapshots" of the four photon-step cycle for water oxidation in photosystem II, a large protein complex in green plants. Photosystem II is the only known biological system able to harness sunlight for the oxidation of water into molecular oxygen.

"An effective method of solar-based water-splitting is essential for artificial photosynthesis to succeed but developing such a method has proven elusive," says Vittal Yachandra, a chemist with Berkeley Lab's Physical Biosciences Division and one of the leaders of this study. "Using femtosecond x-ray pulses for the simultaneous collection of both x-ray diffraction (XRD) and x-ray emission spectroscopy (XES) data at room temperature, we have gone around the four-step catalytic cycle of photosynthetic water oxidation in photosystem II. This represents a major advance towards the real time characterization of the formation of the oxygen molecule in photosystem II, and has yielded information that should prove useful for designing artificial solar-energy based devices to split water."

Photo-oxidation of water by photosystem II is responsible for most of the oxygen in Earth's atmosphere. At the core of photosystem II is a manganese-calcium (Mn4Ca) metalloenzyme complex that when energized by solar photons catalyzes a four photon-step cycle of oxidation states (S0-to-S3) that ultimately yields molecular oxygen. Scientists need to observe intact x-ray crystallogra
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Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

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