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Nitric oxide represses photosystem II and NDH-1 in the cyanobacterium Synechocystis sp. PCC 6803
Molecular Plant Biology, Department of Life Technologies, University of Turku, FI, Turku, Finland.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.ORCID-id: 0000-0002-5174-083x
Molecular Plant Biology, Department of Life Technologies, University of Turku, FI, Turku, Finland.
2022 (Engelska)Ingår i: Biochimica et Biophysica Acta - Bioenergetics, ISSN 0005-2728, E-ISSN 1879-2650, Vol. 1863, nr 1, artikel-id 148507Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Photosynthetic electron transfer comprises a series of light-induced redox reactions catalysed by multiprotein machinery in the thylakoid. These protein complexes possess cofactors susceptible to redox modifications by reactive small molecules. The gaseous radical nitric oxide (NO), a key signalling molecule in green algae and plants, has earlier been shown to bind to Photosystem (PS) II and obstruct electron transfer in plants. The effects of NO on cyanobacterial bioenergetics however, have long remained obscure. In this study, we exposed the model cyanobacterium Synechocystis sp. PCC 6803 to NO under anoxic conditions and followed changes in whole-cell fluorescence and oxidoreduction of P700 in vivo. Our results demonstrate that NO blocks photosynthetic electron transfer in cells by repressing PSII, PSI, and likely the NDH dehydrogenase-like complex 1 (NDH-1). We propose that iron‑sulfur clusters of NDH-1 complex may be affected by NO to such an extent that ferredoxin-derived electron injection to the plastoquinone pool, and thus cyclic electron transfer, may be inhibited. These findings reveal the profound effects of NO on Synechocystis cells and demonstrate the importance of controlled NO homeostasis in cyanobacteria.

Ort, förlag, år, upplaga, sidor
Elsevier, 2022. Vol. 1863, nr 1, artikel-id 148507
Nyckelord [en]
cyanobacteria, Linear electron transport, NADH dehydrogenase-like complex 1, Nitric oxide, Photosynthesis, Photosystem II
Nationell ämneskategori
Biokemi Molekylärbiologi
Identifikatorer
URN: urn:nbn:se:umu:diva-189548DOI: 10.1016/j.bbabio.2021.148507ISI: 000726722800001Scopus ID: 2-s2.0-85118481816OAI: oai:DiVA.org:umu-189548DiVA, id: diva2:1611834
Forskningsfinansiär
NordForsk, 82845Tillgänglig från: 2021-11-16 Skapad: 2021-11-16 Senast uppdaterad: 2025-02-20Bibliografiskt granskad

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Shevela, Dmitriy

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