The lactose carrier of Escherichia coli functionally incorporated in Rhodopseudomonas sphaeroides obeys the regulatory conditions of the phototrophic bacterium

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Abstract
Rhodopseudomonas sphaeroides was provided with the ability to transport lactose via conjugation with a strain of Escherichia coli bearing a plasmid containing the lactose operon (including the lac Y gene, coding for the lactose carrier or M protein) and subsequent expression of the lac operon in Rps. sphaeroides (Nano, F.E. and Kaplan, S. submitted). The initial rate of lactose transport in Rps. sphaeroides was studied as a function of the light intensity and the magnitude of the proton‐motive force. The results demonstrate that lactose transport is regulated by the rate of cyclic electron transfer in the same way as the endogenous transport systems.

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