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The approach of providing an oxygenic photosynthetic organism with a cyclic electron transfer system, i.e., a far-red light-driven proton pump, is widely proposed to maximize photosynthetic efficiency via expanding the absorption spectrum of photosynthetically active radiation. As a first step in this approach,  Gloeobacter  rhodopsin was expressed in a PSI-deletion strain of  Synechocystis  sp. PCC6803. Functional expression of  Gloeobacter  rhodopsin, in contrast to Proteorhodopsin, did not stimulate the rate of photoheterotrophic growth of this  Synechocystis  strain, analyzed with growth rate measurements and competition experiments. Nevertheless, analysis of oxygen uptake and—production rates of the  Gloeobacter  rhodopsin-expressing strains, relative to the ΔPSI control strain, confirm that the proton-pumping  Gloeobacter  rhodopsin provides the cells with additional capacity to generate proton motive force. Significantly, expression of the  Gloeobacter  rhodopsin did modulate levels of pigment formation in the transgenic strain.

Functional Expression of Gloeobacter Rhodopsin in PSI-Less Synechocystis sp. PCC6803