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Event Detail Information

Event Detail Information

Theoretical and Computational Biophysics Group - 'Electron and Energy Transfer in Photosynthetic Reaction Centers and Biohybrid Antenna Complexes'

Speaker Professors Dewey Holten and Christine Kirmaier, Department of Chemistry, Washington University, St. Louis, MO
Date Apr 8, 2013
Time 3:00 pm  
Location 3269 Beckman Institute, 405 N. Mathews Ave
Sponsor Klaus Schulten
Contact Nancy Mallon
Phone 244-1586
Event type Biophysics
Views 2165
The first part of the presentation concerns the primary photochemical steps in the energy conversion process in photosynthesis, which occur in pigment-protein complexes called reaction centers (RCs). In the bacterial RC, the membrane-spanning multi-step charge separation process utilizes only one of two parallel electron-transport chains (the so- A side). Studies of mutant RCs using several different motifs that give B-side charge separation, including with yields up to ~70%, will be described. The combined studies are probing the origins of directionality in the bacterial RCs, including the relative contributions of electronic and energetic factors. The second part of the presentation concerns the development and characterization of biohybrid light-harvesting complexes. These systems combine native or close analogs of the peptides from bacterial photosynthetic antenna complexes, native bacteriochlorophyll a, and wavelength-tunable bioconjugatable synthetic bacteriochlorins. Such systems enhance coverage of the solar spectrum compared to native antenna complexes and can give near-quantitative quantum yields of transfer of the harvested photon energy to the target site.
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