This gene encodes a component of the mediator complex (also known as TRAP, SMCC, DRIP, or ARC), a transcriptional coactivator complex thought to be required for the expression of almost all genes. The mediator complex is recruited by transcriptional activators or nuclear receptors to induce gene expression, possibly by interacting with RNA polymerase II and promoting the formation of a transcriptional pre-initiation complex. The product of this gene is proposed to form a sub-complex with MED12, cyclin C, and CDK8 that can negatively regulate transactivation by mediator.
Zhang X, Krutchinsky A, Fukuda A, Chen W, Yamamura S, Chait BT, Roeder RG (Jul 2005). "MED1/TRAP220 exists predominantly in a TRAP/ Mediator subpopulation enriched in RNA polymerase II and is required for ER-mediated transcription". Molecular Cell. 19 (1): 89–100. doi:10.1016/j.molcel.2005.05.015. PMID15989967.
Wada O, Oishi H, Takada I, Yanagisawa J, Yano T, Kato S (Aug 2004). "BRCA1 function mediates a TRAP/DRIP complex through direct interaction with TRAP220". Oncogene. 23 (35): 6000–5. doi:10.1038/sj.onc.1207786. PMID15208681.