Mediator complex subunit 20 (MED20)

Mediator complex subunit 20 (**MED20**) is a core protein component of the Mediator complex, a large multiprotein coactivator that acts as a central hub for gene regulation by RNA polymerase II[1][4][7]. The Mediator complex integrates signals from DNA-bound transcriptional activators, nuclear receptors, and repression proteins, relaying them to the basal transcription machinery by directly interacting with RNA polymerase II and general transcription factors to assemble a transcriptional pre-initiation complex[1][4][7]. The MED20 protein plays a crucial structural and regulatory role within the Mediator head module, being essential for proper folding and assembly with other subunits such as Med8 and Med18[3][6][7]. Its canonical functions include transcriptional regulation of nearly all RNA polymerase II-dependent genes, and its molecular activity appears to be necessary for both normal gene expression and cellular stress responses[1][2][3][4]. Mutations in MED20 are linked to severe neurodevelopmental disorders, and altered expression or function can influence susceptibility to certain cancers[1]. However, MED20 itself is not currently considered a direct drug target, nor are there known small molecule or biologic drugs aimed specifically at MED20[1][4].

Other names

Mediator of RNA polymerase II transcription subunit 20MED20TRFPhTRFPDKFZp586D2223PRO0213SRB2Trf-proximal protein homologTRF-proximal protein homolog