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Bicarbonate activation of the monomeric photosystem II-PsbS/Psb27 complex
In thylakoid membranes, photosystem II (PSII) monomers from the stromal lamellae contain the subunits PsbS and Psb27 (PSIIm-S/27), while PSII monomers (PSIIm) from granal regions lack these subunits. Here, we have isolated and characterized these 2 types of PSII complexes in tobacco (Nicotiana tabac...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10400029/ https://www.ncbi.nlm.nih.gov/pubmed/37202365 http://dx.doi.org/10.1093/plphys/kiad275 |
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author | Fantuzzi, Andrea Haniewicz, Patrycja Farci, Domenica Loi, M Cecilia Park, Keunha Büchel, Claudia Bochtler, Matthias Rutherford, A William Piano, Dario |
author_facet | Fantuzzi, Andrea Haniewicz, Patrycja Farci, Domenica Loi, M Cecilia Park, Keunha Büchel, Claudia Bochtler, Matthias Rutherford, A William Piano, Dario |
author_sort | Fantuzzi, Andrea |
collection | PubMed |
description | In thylakoid membranes, photosystem II (PSII) monomers from the stromal lamellae contain the subunits PsbS and Psb27 (PSIIm-S/27), while PSII monomers (PSIIm) from granal regions lack these subunits. Here, we have isolated and characterized these 2 types of PSII complexes in tobacco (Nicotiana tabacum). PSIIm-S/27 showed enhanced fluorescence, the near absence of oxygen evolution, and limited and slow electron transfer from Q(A) to Q(B) compared to the near-normal activities in the granal PSIIm. However, when bicarbonate was added to PSIIm-S/27, water splitting and Q(A) to Q(B) electron transfer rates were comparable to those in granal PSIIm. The findings suggest that the binding of PsbS and/or Psb27 inhibits forward electron transfer and lowers the binding affinity for bicarbonate. This can be rationalized in terms of the recently discovered photoprotection role played by bicarbonate binding via the redox tuning of the Q(A)/Q(A)(•−) couple, which controls the charge recombination route, and this limits chlorophyll triplet-mediated (1)O(2) formation. These findings suggest that PSIIm-S/27 is an intermediate in the assembly of PSII in which PsbS and/or Psb27 restrict PSII activity while in transit using a bicarbonate-mediated switch and protective mechanism. |
format | Online Article Text |
id | pubmed-10400029 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-104000292023-08-04 Bicarbonate activation of the monomeric photosystem II-PsbS/Psb27 complex Fantuzzi, Andrea Haniewicz, Patrycja Farci, Domenica Loi, M Cecilia Park, Keunha Büchel, Claudia Bochtler, Matthias Rutherford, A William Piano, Dario Plant Physiol Research Article In thylakoid membranes, photosystem II (PSII) monomers from the stromal lamellae contain the subunits PsbS and Psb27 (PSIIm-S/27), while PSII monomers (PSIIm) from granal regions lack these subunits. Here, we have isolated and characterized these 2 types of PSII complexes in tobacco (Nicotiana tabacum). PSIIm-S/27 showed enhanced fluorescence, the near absence of oxygen evolution, and limited and slow electron transfer from Q(A) to Q(B) compared to the near-normal activities in the granal PSIIm. However, when bicarbonate was added to PSIIm-S/27, water splitting and Q(A) to Q(B) electron transfer rates were comparable to those in granal PSIIm. The findings suggest that the binding of PsbS and/or Psb27 inhibits forward electron transfer and lowers the binding affinity for bicarbonate. This can be rationalized in terms of the recently discovered photoprotection role played by bicarbonate binding via the redox tuning of the Q(A)/Q(A)(•−) couple, which controls the charge recombination route, and this limits chlorophyll triplet-mediated (1)O(2) formation. These findings suggest that PSIIm-S/27 is an intermediate in the assembly of PSII in which PsbS and/or Psb27 restrict PSII activity while in transit using a bicarbonate-mediated switch and protective mechanism. Oxford University Press 2023-05-18 /pmc/articles/PMC10400029/ /pubmed/37202365 http://dx.doi.org/10.1093/plphys/kiad275 Text en © The Author(s) 2023. Published by Oxford University Press on behalf of American Society of Plant Biologists. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Fantuzzi, Andrea Haniewicz, Patrycja Farci, Domenica Loi, M Cecilia Park, Keunha Büchel, Claudia Bochtler, Matthias Rutherford, A William Piano, Dario Bicarbonate activation of the monomeric photosystem II-PsbS/Psb27 complex |
title | Bicarbonate activation of the monomeric photosystem II-PsbS/Psb27 complex |
title_full | Bicarbonate activation of the monomeric photosystem II-PsbS/Psb27 complex |
title_fullStr | Bicarbonate activation of the monomeric photosystem II-PsbS/Psb27 complex |
title_full_unstemmed | Bicarbonate activation of the monomeric photosystem II-PsbS/Psb27 complex |
title_short | Bicarbonate activation of the monomeric photosystem II-PsbS/Psb27 complex |
title_sort | bicarbonate activation of the monomeric photosystem ii-psbs/psb27 complex |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10400029/ https://www.ncbi.nlm.nih.gov/pubmed/37202365 http://dx.doi.org/10.1093/plphys/kiad275 |
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