Inactivation of the extrinsic subunit of photosystem II, PsbU, in Synechococcus PCC 7942 results in elevated resistance to oxidative stress

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Abstract

PsbU is a subunit of the extrinsic complex attached to the core of photosystem II. A PsbU-mutant of Synechococcus PCC 7942 was isolated based on its elevated resistance to externally applied oxidative stress. PsbU-mutant exhibits fast rates of degradation of the photosystem II core protein, D1, under sub-saturating as well as high-light conditions. While forward electron transfer is not affected, back electron flow is severely impaired in the mutant. We suggest that impairment of psbU results in production of reactive-oxygen-species, which trigger antioxidative mechanisms even under standard growth conditions. Accordingly, when challenged with external oxidative stress, these cells are more resistant than wild type cells. © 2006 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

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Balint, I., Bhattacharya, J., Perelman, A., Schatz, D., Moskovitz, Y., Keren, N., & Schwarz, R. (2006). Inactivation of the extrinsic subunit of photosystem II, PsbU, in Synechococcus PCC 7942 results in elevated resistance to oxidative stress. FEBS Letters, 580(8), 2117–2122. https://doi.org/10.1016/j.febslet.2006.03.020

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