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Title: Evidence for a cysteine-mediated mechanism of excitation energy regulation in a photosynthetic antenna complex

All photosynthetic organisms face the challenge of absorbing solar energy and regulating its flow through their light-harvesting antennas across widely varying photic conditions. For anoxygenic phototrophs, this process is complicated by the need to downregulate photosynthetic output when oxygen is encountered. The Fenna–Matthews–Olson protein from green sulfur bacteria is able to quench excitations in aerobic conditions effectively despite its apparent lack of photoprotective accessory molecules, indicating a previously unidentified type of energy transfer regulation. In this study, we provide evidence for a novel energy-quenching mechanism involving cysteine–bacteriochlorophyll photochemistry. In conclusion, this interaction should be able to be programed into other natural or bio-inspired antennas, opening new possibilities for regulating these systems in response to excess light.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2]
  1. Washington Univ. in St. Louis, St. Louis, MO (United States); Arizona State Univ., Tempe, AZ (United States)
  2. Washington Univ. in St. Louis, St. Louis, MO (United States)
  3. Washington Univ. in St. Louis, St. Louis, MO (United States); Arizona State Univ. at Downtown Phoenix, Phoenix, AZ (United States)
Publication Date:
Grant/Contract Number:
SC0001035
Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 113; Journal Issue: 31; Related Information: PARC partners with Washington University in St. Louis (lead); University of California, Riverside; University of Glasgow, UK; Los Alamos National Laboratory; University of New Mexico; New Mexico Corsortium; North Carolina State University; Northwestern University; Oak Ridge National Laboratory; University of Pennsylvania; Sandia National Laboratories; University of Sheffield, UK; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Energy Frontier Research Centers (EFRC), Washington, D.C. (United States). Photosynthetic Antenna Research Center (PARC)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; solar (fuels); photosynthesis (natural and artificial); biofuels (including algae and biomass); bio-inspired; charge transport; membrane; synthesis (novel materials); synthesis (self-assembly)
OSTI Identifier:
1258715
Alternate Identifier(s):
OSTI ID: 1387874