Destabilizes orange carotenoid protein-R form (OCP-R), the FRP-OCP interaction accelerates the OCP-R to OCP-O conversion (PubMed:20534537, PubMed:23716688). Increases fluorescence recovery following non-photochemical quenching (NPQ) by OCP, most probably by destabilizing OCP-R binding to the phycobilisome core (PubMed:21764991). Probably a dimer, interacts with the C-terminal domain of OCP-R (PubMed:23716688). Very tightly associated with the membrane. Transcribed from its own promoter, it may also be cotranscribed with upstream ocp. Decreased fluorescence recovery after non-photochemical quenching (NPQ). Extended N-terminus.