Predicted to enable retinoid X receptor binding activity and transcription coactivator binding activity. Predicted to be involved in several processes, including positive regulation of chromatin binding activity; positive regulation of mediator complex assembly; and regulation of transcription by RNA polymerase II. Predicted to be located in nucleoplasm. Predicted to be part of mediator complex and transcription regulator complex. Orthologous to human MED25 (mediator complex subunit 25). [provided by Alliance of Genome Resources, Apr 2022]