Mapping the ultrafast flow of harvested solar energy in living photosynthetic cells

Peter D. Dahlberg, Po-Chieh Ting, Sara C. Massey, Marco A. Allodi, Elizabeth C. Martin, C. Neil Hunter and Gregory S. Engel ()
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Peter D. Dahlberg: The University of Chicago
Po-Chieh Ting: The University of Chicago
Sara C. Massey: The University of Chicago
Marco A. Allodi: The University of Chicago
Elizabeth C. Martin: University of Sheffield, Firth Court, Western Bank
C. Neil Hunter: University of Sheffield, Firth Court, Western Bank
Gregory S. Engel: The University of Chicago

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Photosynthesis transfers energy efficiently through a series of antenna complexes to the reaction center where charge separation occurs. Energy transfer in vivo is primarily monitored by measuring fluorescence signals from the small fraction of excitations that fail to result in charge separation. Here, we use two-dimensional electronic spectroscopy to follow the entire energy transfer process in a thriving culture of the purple bacteria, Rhodobacter sphaeroides. By removing contributions from scattered light, we extract the dynamics of energy transfer through the dense network of antenna complexes and into the reaction center. Simulations demonstrate that these dynamics constrain the membrane organization into small pools of core antenna complexes that rapidly trap energy absorbed by surrounding peripheral antenna complexes. The rapid trapping and limited back transfer of these excitations lead to transfer efficiencies of 83% and a small functional light-harvesting unit.

Date: 2017
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DOI: 10.1038/s41467-017-01124-z

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