NDLI: Diurnal rhythms in metabolism: A day in the life of a unicellular, diazotrophic cyanobacterium

Content Provider	Springer Nature Link
Author	Sherman, Louis A. Meunier, Pascal Colón López, Milagros S.
Copyright Year	1998
Abstract	N2 fixation and oxygenic photosynthesis are important metabolic processes that are at odds with each other, since the N2-fixing enzyme, nitrogenase, is highly sensitive to oxygen. This review will discuss the strategies devised by the unicellular, diazotrophic cyanobacterium, Cyanothece sp. ATCC 51142, to permit N2 fixation and photosynthesis to coexist in the same cell. This strain, like a number of other unicellular and filamentous (non-heterocystous) cyanobacteria, has developed a type of temporal regulation in which N2 fixation and photosynthesis occur at different times throughout a diurnal cycle. For nitrogenase, everyday dawns anew. The nifHDK operon is tightly regulated, such that transcription and translation occur within the first four hours of the dark period; nitrogenase is then proteolytically degraded. Photosynthesis also varies throughout the day reaching a minimum at the peak of nitrogenase activity and a maximum by late afternoon. This review will mainly concentrate on the various changes that occur in the photosynthetic apparatus as the cell modulates O2 evolution. The results indicate that the redox poise of the plastoquinone pool and the overall cellular energy needs are the basic driving forces behind these changes in the photosynthetic apparatus. Throughout the course of the diurnal cycle, Photosystem II becomes very heterogeneous as determined by 77 K fluorescence spectra, PAM fluorescence and O2-flash yield experiments. This system provides some important insight into cyanobacterial state transitions and, especially, on the organization of the photosystems within the membrane. Overall, PS II is altered on both the oxidizing and reducing sides of the photosystem.
Starting Page	25
Ending Page	42
Page Count	18
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	58
Issue Number	1
e-ISSN	15735079
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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