MED8
Description
The MED8 (mediator complex subunit 8) is a protein-coding gene located on chromosome 1.
MED8, encoded by the MED8 gene in humans, is an enzyme that forms part of the Mediator complex, a multi-subunit complex essential for activating transcription. The Mediator complex, originally identified in S. cerevisiae, is required for the activation of transcription. MED8 also interacts with elongins B and C, as well as CUL2 and RBX1, to assemble a ubiquitin ligase. There are five alternative transcripts that encode four isoforms of MED8. MED8 has been shown to interact with MED26.
MED8 is a subunit of the Mediator complex, a crucial coactivator in the regulated transcription of almost all RNA polymerase II-dependent genes. It acts as a bridge, relaying information from gene-specific regulatory proteins to the basal RNA polymerase II transcription machinery. MED8 is recruited to promoters through direct interactions with regulatory proteins and provides a scaffold for the assembly of a functional preinitiation complex alongside RNA polymerase II and general transcription factors. Additionally, MED8 might play a role in E3 ubiquitin-protein ligase complexes, facilitating ubiquitination and subsequent proteasomal degradation of target proteins.
MED8 is also known as ARC32.
