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Title: Overall energy conversion efficiency of a photosynthetic vesicle

Abstract

The chromatophore of purple bacteria is an intracellular spherical vesicle that exists in numerous copies in the cell and that efficiently converts sunlight into ATP synthesis, operating typically under low light conditions. Building on an atomic-level structural model of a low-light-adapted chromatophore vesicle from Rhodobacter sphaeroides, we investigate the cooperation between more than a hundred protein complexes in the vesicle. The steady-state ATP production rate as a function of incident light intensity is determined after identifying quinol turnover at the cytochrome b c 1 complex (cyt b c 1 ) as rate limiting and assuming that the quinone/quinol pool of about 900 molecules acts in a quasi-stationary state. For an illumination condition equivalent to 1% of full sunlight, the vesicle exhibits an ATP production rate of 82 ATP molecules/s. The energy conversion efficiency of ATP synthesis at illuminations corresponding to 1%–5% of full sunlight is calculated to be 0.12–0.04, respectively. The vesicle stoichiometry, evolutionarily adapted to the low light intensities in the habitat of purple bacteria, is suboptimal for steady-state ATP turnover for the benefit of protection against over-illumination.

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5]
  1. Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, United States, Department of Physics, University of Illinois at Urbana-Champaign, Urbana, United States
  2. Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, United States, Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Urbana, United States
  3. Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, United States
  4. Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, United Kingdom
  5. Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, United States, Department of Physics, University of Illinois at Urbana-Champaign, Urbana, United States, Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Urbana, United States
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Energy Frontier Research Centers (EFRC) (United States). Photosynthetic Antenna Research Center (PARC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science foundation (NSF); National Institutes of Health (NIH); European Research Council (ERC)
OSTI Identifier:
1307791
Alternate Identifier(s):
OSTI ID: 1307792; OSTI ID: 1388788
Grant/Contract Number:  
SC0001035; AC05-00OR22725; BB/M000265/1
Resource Type:
Published Article
Journal Name:
eLife
Additional Journal Information:
Journal Name: eLife Journal Volume: 5; Journal ID: ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.
Country of Publication:
United States
Language:
English
Subject:
10 SYNTHETIC FUELS; 14 SOLAR ENERGY; solar (fuels); photosynthesis (natural and artificial); biofuels (including algae and biomass); bio-inspired; charge transport; membrane; synthesis (novel materials); synthesis (self-assembly)

Citation Formats

Sener, Melih, Strumpfer, Johan, Singharoy, Abhishek, Hunter, C. Neil, and Schulten, Klaus. Overall energy conversion efficiency of a photosynthetic vesicle. United States: N. p., 2016. Web. doi:10.7554/eLife.09541.
Sener, Melih, Strumpfer, Johan, Singharoy, Abhishek, Hunter, C. Neil, & Schulten, Klaus. Overall energy conversion efficiency of a photosynthetic vesicle. United States. doi:10.7554/eLife.09541.
Sener, Melih, Strumpfer, Johan, Singharoy, Abhishek, Hunter, C. Neil, and Schulten, Klaus. Fri . "Overall energy conversion efficiency of a photosynthetic vesicle". United States. doi:10.7554/eLife.09541.
@article{osti_1307791,
title = {Overall energy conversion efficiency of a photosynthetic vesicle},
author = {Sener, Melih and Strumpfer, Johan and Singharoy, Abhishek and Hunter, C. Neil and Schulten, Klaus},
abstractNote = {The chromatophore of purple bacteria is an intracellular spherical vesicle that exists in numerous copies in the cell and that efficiently converts sunlight into ATP synthesis, operating typically under low light conditions. Building on an atomic-level structural model of a low-light-adapted chromatophore vesicle from Rhodobacter sphaeroides, we investigate the cooperation between more than a hundred protein complexes in the vesicle. The steady-state ATP production rate as a function of incident light intensity is determined after identifying quinol turnover at the cytochrome b c 1 complex (cyt b ⁢ c 1 ) as rate limiting and assuming that the quinone/quinol pool of about 900 molecules acts in a quasi-stationary state. For an illumination condition equivalent to 1% of full sunlight, the vesicle exhibits an ATP production rate of 82 ATP molecules/s. The energy conversion efficiency of ATP synthesis at illuminations corresponding to 1%–5% of full sunlight is calculated to be 0.12–0.04, respectively. The vesicle stoichiometry, evolutionarily adapted to the low light intensities in the habitat of purple bacteria, is suboptimal for steady-state ATP turnover for the benefit of protection against over-illumination.},
doi = {10.7554/eLife.09541},
journal = {eLife},
number = ,
volume = 5,
place = {United States},
year = {2016},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.7554/eLife.09541

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Cited by: 20 works
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Light harvesting complex II B850 excitation dynamics
journal, December 2009

  • Strümpfer, Johan; Schulten, Klaus
  • The Journal of Chemical Physics, Vol. 131, Issue 22
  • DOI: 10.1063/1.3271348

Excitation Transfer in the Core Light-Harvesting Complex (LH-1) of Rhodobacter sphaeroides: An Ultrafast Fluorescence Depolarization and Annihilation Study
journal, October 1995

  • Bradforth, Stephen E.; Jimenez, Ralph; van Mourik, Frank
  • The Journal of Physical Chemistry, Vol. 99, Issue 43
  • DOI: 10.1021/j100043a071