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Functional flexibility of cyanobacterial light harvesting phycobilisomes enable acclimation to the complex light regime of mixing marine water columns
The light environment in a mixing water column is arguably the most erratic condition under which photosynthesis functions. Shifts in light intensity, by an order of magnitude, can occur over the time scale of hours. In marine Synechococcus, light is harvested by massive, membrane attached, phycobil...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10086978/ https://www.ncbi.nlm.nih.gov/pubmed/35993149 http://dx.doi.org/10.1111/febs.16597 |
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author | Bezalel‐Hazony, Noa Zer, Hagit Nathanson, Shiri Shevtsov‐Tal, Sofia Ostersetzer‐Biran, Oren Keren, Nir |
author_facet | Bezalel‐Hazony, Noa Zer, Hagit Nathanson, Shiri Shevtsov‐Tal, Sofia Ostersetzer‐Biran, Oren Keren, Nir |
author_sort | Bezalel‐Hazony, Noa |
collection | PubMed |
description | The light environment in a mixing water column is arguably the most erratic condition under which photosynthesis functions. Shifts in light intensity, by an order of magnitude, can occur over the time scale of hours. In marine Synechococcus, light is harvested by massive, membrane attached, phycobilisome chromophore‐protein complexes (PBS). We examined the ability of a phycobilisome‐containing marine Synechococcus strain (WH8102) to acclimate to illumination perturbations on this scale. Although changes in pigment composition occurred gradually over the course of days, we did observe significant and reversible changes in the pigment's fluorescence emission spectra on a time scale of hours. Upon transition to ten‐fold higher intensities, we observed a decrease in the energy transferred to Photosystem II. At the same time, the spectral composition of PBS fluorescence emission shifted. Unlike fluorescence quenching mechanisms, this phenomenon resulted in increased fluorescence intensities. These data suggest a mechanism by which marine Synechococcus WH8102 detaches hexamers from the phycobilisome structure. The fluorescence yield of these uncoupled hexamers is high. The detachment process does not require protein synthesis as opposed to reattachment. Hence, the most likely process would be the degradation and resynthesis of labile PBS linker proteins. Experiments with additional species yielded similar results, suggesting that this novel mechanism might be broadly used among PBS‐containing organisms. |
format | Online Article Text |
id | pubmed-10086978 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-100869782023-04-12 Functional flexibility of cyanobacterial light harvesting phycobilisomes enable acclimation to the complex light regime of mixing marine water columns Bezalel‐Hazony, Noa Zer, Hagit Nathanson, Shiri Shevtsov‐Tal, Sofia Ostersetzer‐Biran, Oren Keren, Nir FEBS J Original Articles The light environment in a mixing water column is arguably the most erratic condition under which photosynthesis functions. Shifts in light intensity, by an order of magnitude, can occur over the time scale of hours. In marine Synechococcus, light is harvested by massive, membrane attached, phycobilisome chromophore‐protein complexes (PBS). We examined the ability of a phycobilisome‐containing marine Synechococcus strain (WH8102) to acclimate to illumination perturbations on this scale. Although changes in pigment composition occurred gradually over the course of days, we did observe significant and reversible changes in the pigment's fluorescence emission spectra on a time scale of hours. Upon transition to ten‐fold higher intensities, we observed a decrease in the energy transferred to Photosystem II. At the same time, the spectral composition of PBS fluorescence emission shifted. Unlike fluorescence quenching mechanisms, this phenomenon resulted in increased fluorescence intensities. These data suggest a mechanism by which marine Synechococcus WH8102 detaches hexamers from the phycobilisome structure. The fluorescence yield of these uncoupled hexamers is high. The detachment process does not require protein synthesis as opposed to reattachment. Hence, the most likely process would be the degradation and resynthesis of labile PBS linker proteins. Experiments with additional species yielded similar results, suggesting that this novel mechanism might be broadly used among PBS‐containing organisms. John Wiley and Sons Inc. 2022-08-29 2023-01 /pmc/articles/PMC10086978/ /pubmed/35993149 http://dx.doi.org/10.1111/febs.16597 Text en © 2022 The Authors. The FEBS Journal published by John Wiley & Sons Ltd on behalf of Federation of European Biochemical Societies. https://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
spellingShingle | Original Articles Bezalel‐Hazony, Noa Zer, Hagit Nathanson, Shiri Shevtsov‐Tal, Sofia Ostersetzer‐Biran, Oren Keren, Nir Functional flexibility of cyanobacterial light harvesting phycobilisomes enable acclimation to the complex light regime of mixing marine water columns |
title | Functional flexibility of cyanobacterial light harvesting phycobilisomes enable acclimation to the complex light regime of mixing marine water columns |
title_full | Functional flexibility of cyanobacterial light harvesting phycobilisomes enable acclimation to the complex light regime of mixing marine water columns |
title_fullStr | Functional flexibility of cyanobacterial light harvesting phycobilisomes enable acclimation to the complex light regime of mixing marine water columns |
title_full_unstemmed | Functional flexibility of cyanobacterial light harvesting phycobilisomes enable acclimation to the complex light regime of mixing marine water columns |
title_short | Functional flexibility of cyanobacterial light harvesting phycobilisomes enable acclimation to the complex light regime of mixing marine water columns |
title_sort | functional flexibility of cyanobacterial light harvesting phycobilisomes enable acclimation to the complex light regime of mixing marine water columns |
topic | Original Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10086978/ https://www.ncbi.nlm.nih.gov/pubmed/35993149 http://dx.doi.org/10.1111/febs.16597 |
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