Journal article

Publication year: 2005

Pages: 903-914

Journal: Molecular Microbiology

Volume number: 58

Issue number: 3

ISSN: 0950-382X

Open access status: Bronze

DOI Link: https://doi.org/10.1111/j.1365-2958.2005.04882.x

Publisher: Wiley

Abstract: 
Formation of the photosynthetic apparatus in Rhodobacter is regulated by oxygen tension and light intensity. Here we show that in anaerobically grown Rhodobacter cells a light-dependent increase in expression of the puc and puf operons encoding structural proteins of the photosynthetic complexes requires an active photosynthetic electron transport. The redox-sensitive CrtJ/PpsR repressor of photosynthesis genes, which was suggested to mediate electron transport-dependent signals, is not involved in this light-dependent signal chain. Our data reveal that the signal initiated in the photosynthetic reaction centre is transmitted via components of the electron transport chain and the PrrB/PrrA two-component system in Rhodobacter sphaeroides. Under blue light illumination in the absence of oxygen this signal leads to activation of photosynthesis genes and interferes with a blue-light repression mediated by the AppA photoreceptor and the PpsR transcriptional repressor in R. sphaeroides. Thus, light either sensed by a photoreceptor or initiating photosynthetic electron transport has opposite effects on the transcription of photosynthesis genes. Both signalling pathways involve redox-dependent steps that finally determine the effect of light on gene expression.

Harvard Citation style: Happ, H., Braatsch, S., Broschek, V., Osterloh, L. and Klug, G. (2005) Light-dependent regulation of photosynthesis genes in Rhodobacter sphaeroides 2.4.1 is coordinately controlled by photosynthetic electron transport via the PrrBA two-component system and the photoreceptor AppA, Molecular Microbiology, 58(3), pp. 903-914. https://doi.org/10.1111/j.1365-2958.2005.04882.x

APA Citation style: Happ, H., Braatsch, S., Broschek, V., Osterloh, L., & Klug, G. (2005). Light-dependent regulation of photosynthesis genes in Rhodobacter sphaeroides 2.4.1 is coordinately controlled by photosynthetic electron transport via the PrrBA two-component system and the photoreceptor AppA. Molecular Microbiology. 58(3), 903-914. https://doi.org/10.1111/j.1365-2958.2005.04882.x