Predicted to enable thyroid hormone receptor binding activity and transcription coactivator activity. Predicted to be involved in positive regulation of transcription initiation from RNA polymerase II promoter and transcription by RNA polymerase II. Predicted to be located in nucleoplasm. Predicted to be part of core mediator complex and mediator complex. Orthologous to human MED4 (mediator complex subunit 4). [provided by Alliance of Genome Resources, Apr 2022]