Evidence for a cysteine-mediated mechanism of excitation energy regulation in a photosynthetic antenna complex
- Department of Chemistry, Washington University in St. Louis, St. Louis, MO 63130,, Department of Biology, Washington University in St. Louis, St. Louis, MO 63130,, Photosynthetic Antenna Research Center, Washington University in St. Louis, St. Louis, MO 63130
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130,, Photosynthetic Antenna Research Center, Washington University in St. Louis, St. Louis, MO 63130
- Photosynthetic Antenna Research Center, Washington University in St. Louis, St. Louis, MO 63130
- Department of Chemistry, Washington University in St. Louis, St. Louis, MO 63130,, Photosynthetic Antenna Research Center, Washington University in St. Louis, St. Louis, MO 63130
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130,
- Department of Chemistry, Washington University in St. Louis, St. Louis, MO 63130,
Significance 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. 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.
- Research Organization:
- Energy Frontier Research Centers (EFRC), Washington, D.C. (United States). Photosynthetic Antenna Research Center (PARC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0001035
- OSTI ID:
- 1258715
- Alternate ID(s):
- OSTI ID: 1387874
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 113 Journal Issue: 31; ISSN 0027-8424
- Publisher:
- Proceedings of the National Academy of SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Structure, Function and Reconstitution of Antenna Complexes of Green Photosynthetic Bacteria
Structural model and spectroscopic characteristics of the FMO antenna protein from the aerobic chlorophototroph, Candidatus Chloracidobacterium thermophilum