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Photodamage of iron–sulphur clusters in photosystem I induces non-photochemical energy dissipation
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Molecular Biomimetics.
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2016 (English)In: Nature Plants, ISSN 2055-026X, Vol. 2, no 4, 16035Article in journal (Refereed) Published
Abstract [en]

Photosystem I (PSI) uses light energy and electrons supplied by photosystem II (PSII) to reduce NADP(+) to NADPH. PSI is very tolerant of excess light but extremely sensitive to excess electrons from PSII. It has been assumed that PSI is protected from photoinhibition by strict control of the intersystem electron transfer chain (ETC). Here we demonstrate that the iron-sulphur (FeS) clusters of PSI are more sensitive to high light stress than previously anticipated, but PSI with damaged FeS clusters still functions as a non-photochemical photoprotective energy quencher (PSI-NPQ). Upon photoinhibition of PSI, the highly reduced ETC further triggers thylakoid phosphorylation-based mechanisms that increase energy flow towards PSI. It is concluded that the sensitivity of FeS clusters provides an additional photoprotective mechanism that is able to downregulate PSII, based on PSI quenching and protein phosphorylation.

Place, publisher, year, edition, pages
2016. Vol. 2, no 4, 16035
National Category
Biochemistry and Molecular Biology
Research subject
Biochemistry
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URN: urn:nbn:se:uu:diva-282637DOI: 10.1038/NPLANTS.2016.35ISI: 000375397600007PubMedID: 27249566OAI: oai:DiVA.org:uu-282637DiVA: diva2:917368
Available from: 2016-04-06 Created: 2016-04-06 Last updated: 2017-02-15Bibliographically approved

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Mamedov, FikretStyring, Stenbjörn

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