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Background UV-B radiation inhibits the electron transport of the PSII complex by damaging the Mn cluster of water oxidation and leads to the degradation of the D1 subunit of the reaction center complex [1,2]. In intact cells the inhibited PSII activity can be restored via de novo synthesis of the D1 subunit [3]. The FtsH protease has been shown to play an important role in the turnover of the D1 protein when induced by visible light both in higher plants and in cyanobacteria [4,5]. However, the role of FtsH in the damage and repair of PSII under UV-B irradiation has not been clarified. Here we studied this question by using a mutant strain of Synechocystis 6803 cyanobacterium, which lacks the slr0228 gene that encodes one of the FtsH homologues.

The FtsH protease is required for the repair of Photosystem II in the cyanbacterium Synechocystis6803 damaged UV-B radiation