Component of the mediator complex, a complex that can either repress or activate transcription. Mediator complexes are essential for basal and regulated expression of nearly all RNA polymerase II-dependent genes. They may act as a bridge, conveying regulatory information from enhancers and other control elements to the promoter (By similarity). Component of the TRAP/SMCC mediator complex. Interacts with MED20/TRFP. Associates with the MED18-MED20 heteromer (By similarity). Belongs to the Mediator complex subunit 29 family.