May participate in the regulation of visual phototransduction or in the integration of photoreceptor metabolism. Inhibits the transcriptional activation activity of the cone-rod homeobox CRX. Forms a complex with the beta and gamma subunits of the GTP-binding protein, transducin. Interacts with CRX. Light-induced changes in cyclic nucleotide levels modulate the phosphorylation of this protein by cAMP kinase. Belongs to the phosducin family. Retina International's Scientific Newsletter