An amphiphilic polymer carrying an artificial fluorescent dye, Rhodamine 6G (Rh6G), acts as a good solubilizing agent for a hydrophobic membrane protein, the photosystem (PS) I complex from Spirulina platensis, and at the same time as an efficient sensitizing agent in the green wavelength region, resulting in an enhancement of the primary charge separation within the complex by ca. 1.5-fold.