Abstract
To facilitate genetic analysis and manipulation of the bacterial photosynthetic apparatus, a new plasmid vector bearing the reaction center and light harvesting structural genes (puf operon) of Rhodobacter capsulatus was constructed. This plasmid (pU2922) can be conjugated from E. coli strains (tra+) to Rb. capsulatus with high frequency and shows improved fidelity and stability over Co1E1 derivatives. The puf genes may be expressed in trans from pU2922 in Rb. capsulatus deletion backgrounds to assay the effects of directed mutations or to isolate plasmid–borne spontaneous mutations. We have used this genetic system to characterize a total of 27 mutations at five sequence positions in the secondary quinone–binding domain of the reaction center, where six different herbicides assayed in this study act as competitive inhibitors. The broad spectrum of herbicide response ranging from increased resistance to increased sensitivity that is observed in these engineered bacterial strains may provide a sensitive indicator of the interactions of a given herbicide with the binding site. This collection should prove useful for screening new derivatives for their herbicidal activity and for understanding the chemistry of herbicide binding.
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Bylina, E., Jovine, R. & Youvan, D. A Genetic System for Rapidly Assessing Herbicides That Compete for the Quinone Binding Site of Photosynthetic Reaction Centers. Nat Biotechnol 7, 69–74 (1989). https://doi.org/10.1038/nbt0189-69
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DOI: https://doi.org/10.1038/nbt0189-69