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

Abstract

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:
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)
OSTI Identifier:
1258715
Alternate Identifier(s):
OSTI ID: 1387874
Grant/Contract Number:  
SC0001035
Resource Type:
Journal Article: 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)
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)

Citation Formats

Orf, Gregory S., Saer, Rafael G., Niedzwiedzki, Dariusz M., Zhang, Hao, McIntosh, Chelsea L., Schultz, Jason W., Mirica, Liviu M., and Blankenship, Robert E. Evidence for a cysteine-mediated mechanism of excitation energy regulation in a photosynthetic antenna complex. United States: N. p., 2016. Web. doi:10.1073/pnas.1603330113.
Orf, Gregory S., Saer, Rafael G., Niedzwiedzki, Dariusz M., Zhang, Hao, McIntosh, Chelsea L., Schultz, Jason W., Mirica, Liviu M., & Blankenship, Robert E. Evidence for a cysteine-mediated mechanism of excitation energy regulation in a photosynthetic antenna complex. United States. doi:10.1073/pnas.1603330113.
Orf, Gregory S., Saer, Rafael G., Niedzwiedzki, Dariusz M., Zhang, Hao, McIntosh, Chelsea L., Schultz, Jason W., Mirica, Liviu M., and Blankenship, Robert E. Wed . "Evidence for a cysteine-mediated mechanism of excitation energy regulation in a photosynthetic antenna complex". United States. doi:10.1073/pnas.1603330113.
@article{osti_1258715,
title = {Evidence for a cysteine-mediated mechanism of excitation energy regulation in a photosynthetic antenna complex},
author = {Orf, Gregory S. and Saer, Rafael G. and Niedzwiedzki, Dariusz M. and Zhang, Hao and McIntosh, Chelsea L. and Schultz, Jason W. and Mirica, Liviu M. and Blankenship, Robert E.},
abstractNote = {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.},
doi = {10.1073/pnas.1603330113},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 31,
volume = 113,
place = {United States},
year = {Wed Jun 22 00:00:00 EDT 2016},
month = {Wed Jun 22 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1073/pnas.1603330113

Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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