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Photosynthesis, biological nitrogen fixation, and carbon dioxide assimilation are three essential biological reactions that are catalyzed by photosynthetic bacteria. In the present study, mutant strains of the nonsulfur purple photosynthetic bacteria Rhodospirillum rubrum and Rhodobacter sphaeroides, which had a blockage in the primary CO 2 assimilatory pathway, depress the production of key nitrogen fixation enzyme complex components and abrogate standard control mechanisms. This response is within the confinement of a two-component signal transduction system that has been used to control photosystem biosynthesis and gene transcription of genes essential for CO 2 fixation via the CBB pathway and alternate routes. These findings reveal that there exists a molecular link between the CBB and nitrogen fixation process, which allows the cell to overcome sophisticated control systems to eliminate excess reduction power generated by photosynthesis and carbon metabolism, enabling the cell to overcome difficult control techniques to disable excess reduction power generated by photosynthesis and carbon metabolism.
Source link: https://doi.org/10.1073/pnas.93.25.14515
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