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Electron transport regulates exchange of two forms of photosystem II D1 protein in the cyanobacterium Synechococcus.

1995; Springer Nature; Volume: 14; Issue: 22 Linguagem: Inglês

10.1002/j.1460-2075.1995.tb00232.x

1460-2075

Douglas A. Campbell, GQ Zhou, Per Gustafsson, Gunnar Öquist, A. K. Clarke,

Light effects on plants

Research Article15 November 1995free access Electron transport regulates exchange of two forms of photosystem II D1 protein in the cyanobacterium Synechococcus. D. Campbell D. Campbell Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author G. Zhou G. Zhou Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author P. Gustafsson P. Gustafsson Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author G. Oquist G. Oquist Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author A. K. Clarke A. K. Clarke Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author D. Campbell D. Campbell Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author G. Zhou G. Zhou Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author P. Gustafsson P. Gustafsson Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author G. Oquist G. Oquist Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author A. K. Clarke A. K. Clarke Department of Plant Physiology, University of Umeå, Sweden. Search for more papers by this author Author Information D. Campbell1, G. Zhou1, P. Gustafsson1, G. Oquist1 and A. K. Clarke1 1Department of Plant Physiology, University of Umeå, Sweden. The EMBO Journal (1995)14:5457-5466https://doi.org/10.1002/j.1460-2075.1995.tb00232.x PDFDownload PDF of article text and main figures. ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InMendeleyWechatReddit Figures & Info Synechococcus sp. PCC 7942 modulates photosynthetic function by transiently replacing the constitutive D1 photosystem II protein, D1:1, with an alternate form, D1:2, to help counteract photoinhibition under excess light. We show that a temperature drop from 37 to 25 degrees C also drives D1:1/D1:2 exchange under constant, moderate light. Chilling or light-induced D1 exchange results from rapid loss of psbAI message coding for D1:1 and accumulation of psbAII and psbAIII messages coding for D1:2. During chilling, a large pool of a novel form, D1:2*, transiently accumulates, distinguishable from normal D1 by an increase in apparent molecular mass. D1:2* is not phosphorylated and is probably a functionally inactive, incompletely processed precursor. After acclimation to 25 degrees C, D1:2* disappears and D1:1 again predominates, although substantial D1:2 remains. Partial inhibition of electron transport under constant, moderate light also triggers the D1 exchange process. These treatments all increase excitation pressure on photosystem II relative to electron transport. Therefore, information from photosynthetic electron transport regulates D1 exchange without any requirement for a change in light intensity or quality, possibly via a redox sensing mechanism proximal to photosystem II. Previous ArticleNext Article Volume 14Issue 221 November 1995In this issue RelatedDetailsLoading ...