ArticleProceedings of the National Academy of Sciences of the United States of America2012
Tracking energy transfer between light harvesting complex 2 and 1 in photosynthetic membranes grown under high and low illumination.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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13 citing papers in PubMed, 42 citations in OpenAlex.
- Charting light harvesting in purple bacteria in vivo.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Two solutions for efficient light-harvesting in phototrophicmSystems · 2026Article
- A distinct double-ring LH1-LH2 photocomplex from an extremophilic phototroph.Nature communications · 2025Article
- Lighting the way: Compelling open questions in photosynthesis research.The Plant cell · 2024Article
- Elucidating interprotein energy transfer dynamics within the antenna network from purple bacteria.Proceedings of the National Academy of Sciences of the United States of America · 2023Article
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- Cryo-EM structures of light-harvesting 2 complexes fromProceedings of the National Academy of Sciences of the United States of America · 2022Article
- Open hardware microsecond dispersive transient absorption spectrometer for linear optical response.Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology · 2022Article
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- Article
- Energy transfer in purple bacterial photosynthetic units from cells grown in various light intensities.Photosynthesis research · 2018Article
- Elementary Energy Transfer Pathways in Allochromatium vinosum Photosynthetic Membranes.Biophysical journal · 2015Article
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Authors and funding
10 authors at 6 institutions in 4 countries.
Funding
Abstract
Energy transfer (ET) between B850 and B875 molecules in light harvesting complexes LH2 and LH1/RC (reaction center) complexes has been investigated in membranes of Rhodopseudomonas palustris grown under high- and low-light conditions. In these bacteria, illumination intensity during growth strongly affects the type of LH2 complexes synthesized, their optical spectra, and their amount of energetic disorder. We used a specially built femtosecond spectrometer, combining tunable narrowband pump with broadband white-light probe pulses, together with an analytical method based on derivative spectroscopy for disentangling the congested transient absorption spectra of LH1 and LH2 complexes. This procedure allows real-time tracking of the forward (LH2 → LH1) and backward (LH2←LH1) ET processes and unambiguous determination of the corresponding rate constants. In low-light grown samples, we measured lower ET rates in both directions with respect to high-light ones, which is explained by reduced spectral overlap between B850 and B875 due to partial redistribution of oscillator strength into a higher energetic exciton transition. We find that the low-light adaptation in R. palustris leads to a reduced elementary backward ET rate, in accordance with the low probability of two simultaneous excitations reaching the same LH1/RC complex under weak illumination. Our study suggests that backward ET is not just an inevitable consequence of vectorial ET with small energetic offsets, but is in fact actively managed by photosynthetic bacteria.
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