Efficiency of light harvesting in a photosynthetic bacterium adapted to different levels of light

Timpmann, Kõu; Chenchiliyan, Manoop; Jalviste, Erko; Timney, John A.; Hunter, C. Neil; Freiberg, Arvi

doi:10.1016/j.bbabio.2014.06.007

Title: Efficiency of light harvesting in a photosynthetic bacterium adapted to different levels of light

Journal Article · 01 October 2014 · Biochimica et Biophysica Acta - Bioenergetics

DOI: https://doi.org/10.1016/j.bbabio.2014.06.007 · OSTI ID:1227544

Timpmann, Kõu ^[1]; Chenchiliyan, Manoop ^[1]; Jalviste, Erko ^[1]; Timney, John A. ^[2]; Hunter, C. Neil ^[2]; Freiberg, Arvi ^[1]

University of Tartu (Estonia)
Univ. of Sheffield (United Kingdom)

In this study, we use the photosynthetic purple bacterium Rhodobacter sphaeroides to find out how the acclimation of photosynthetic apparatus to growth conditions influences the rates of energy migration toward the reaction center traps and the efficiency of charge separation at the reaction centers. To answer these questions we measured the spectral and picosecond kinetic fluorescence responses as a function of excitation intensity in membranes prepared from cells grown under different illumination conditions. A kinetic model analysis yielded the microscopic rate constants that characterize the energy transfer and trapping inside the photosynthetic unit as well as the dependence of exciton trapping efficiency on the ratio of the peripheral LH2 and core LH1 antenna complexes, and on the wavelength of the excitation light. A high quantum efficiency of trapping over 80% was observed in most cases, which decreased toward shorter excitation wavelengths within the near infrared absorption band. At a fixed excitation wavelength the efficiency declines with the LH2/LH1 ratio. From the perspective of the ecological habitat of the bacteria the higher population of peripheral antenna facilitates growth under dim light even though the energy trapping is slower in low light adapted membranes. The similar values for the trapping efficiencies in all samples imply a robust photosynthetic apparatus that functions effectively at a variety of light intensities.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Photosynthetic Antenna Research Center (PARC); Washington Univ., St. Louis, MO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001035

OSTI ID:: 1227544

Alternate ID(s):: OSTI ID: 1136126; OSTI ID: 1167765

Report Number(s):: DE-SC0001035-115

Journal Information:: Biochimica et Biophysica Acta - Bioenergetics, Vol. 1837, Issue 10; 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; ISSN 0005-2728

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
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Title: Efficiency of light harvesting in a photosynthetic bacterium adapted to different levels of light

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