Mediator complex subunit 17 (MED17)

Mediator complex subunit 17 (MED17) is a critical structural and functional component of the Mediator complex—a large multi-protein assembly that acts as a central coactivator for regulated transcription of almost all RNA polymerase II-dependent genes in eukaryotes[1][2][3][4]. MED17 forms the main connection between the head and other modules of the Mediator, functioning as a scaffold for assembly and recruitment of additional subunits and transcription factors[3][4][5]. Its activity is essential for transcription initiation, and it mediates interactions with SP1, nuclear hormone receptors (like thyroid hormone and vitamin D receptors), and DNA repair machinery (linking it to nucleotide excision repair processes)[2][6]. Loss or mutation of MED17 leads to profound gene expression defects and is associated with rare neurodevelopmental disease in humans[1]. Currently, no drugs directly target MED17, and experimental evidence suggests that perturbing its function results in broad deleterious cellular effects[1][6].

Other names

Mediator of RNA polymerase II transcription subunit 17ARC77CRSP6DRIP77DRIP80TRAP80CRSP complex subunit 6Trap80CRSP77SRB4Cofactor required for Sp1 transcriptional activation subunit 6Thyroid hormone receptor-associated protein complex 80 kDa componentTranscriptional coactivator CRSP77Vitamin D3 receptor-interacting protein complex 80 kDa componentEpididymis secretory sperm binding protein (rare/obsolete)

Not applicable; no direct drugs/mechanism targeting MED17. Any pharmacological effect would be indirect or via broader disruption of transcriptional machinery or the Mediator complex.