The domain within your query sequence starts at position 2 and ends at position 75; the E-value for the Med8 domain shown below is 3.7e-23.

RQTEGRVPVFSHEVVPDHLRTKPDPEVEEQEKQLTTDAARIGADAAQKQIQSLNKMCSNL
LEKISKEERESESG

Med8

Med8
PFAM accession number:PF10232
Interpro abstract (IPR019364):

The Mediator complex is a coactivator involved in the regulated transcription of nearly all RNA polymerase II-dependent genes. Mediator functions as a bridge to convey information from gene-specific regulatory proteins to the basal RNA polymerase II transcription machinery. The Mediator complex, having a compact conformation in its free form, is recruited to promoters by direct interactions with regulatory proteins and serves for the assembly of a functional preinitiation complex with RNA polymerase II and the general transcription factors. On recruitment the Mediator complex unfolds to an extended conformation and partially surrounds RNA polymerase II, specifically interacting with the unphosphorylated form of the C-terminal domain (CTD) of RNA polymerase II. The Mediator complex dissociates from the RNA polymerase II holoenzyme and stays at the promoter when transcriptional elongation begins.

The Mediator complex is composed of at least 31 subunits: MED1, MED4, MED6, MED7, MED8, MED9, MED10, MED11, MED12, MED13, MED13L, MED14, MED15, MED16, MED17, MED18, MED19, MED20, MED21, MED22, MED23, MED24, MED25, MED26, MED27, MED29, MED30, MED31, CCNC, CDK8 and CDC2L6/CDK11.

The subunits form at least three structurally distinct submodules. The head and the middle modules interact directly with RNA polymerase II, whereas the elongated tail module interacts with gene-specific regulatory proteins. Mediator containing the CDK8 module is less active than Mediator lacking this module in supporting transcriptional activation.

  • The head module contains: MED6, MED8, MED11, SRB4/MED17, SRB5/MED18, ROX3/MED19, SRB2/MED20 and SRB6/MED22.
  • The middle module contains: MED1, MED4, NUT1/MED5, MED7, CSE2/MED9, NUT2/MED10, SRB7/MED21 and SOH1/MED31. CSE2/MED9 interacts directly with MED4.
  • The tail module contains: MED2, PGD1/MED3, RGR1/MED14, GAL11/MED15 and SIN4/MED16.
  • The CDK8 module contains: MED12, MED13, CCNC and CDK8.

Individual preparations of the Mediator complex lacking one or more distinct subunits have been variously termed ARC, CRSP, DRIP, PC2, SMCC and TRAP.

Arc32, or Med8, is one of the subunits of the Mediator complex of RNA polymerase II. The region conserved contains two alpha helices putatively necessary for binding to other subunits within the core of the Mediator complex. The N terminus of Med8 binds to the essential core Head part of Mediator and the C terminus hinges to Med18 on the non-essential part of the Head that also includes Med20 [ (PUBMED:18381891) ].

GO process:regulation of transcription by RNA polymerase II (GO:0006357)
GO component:mediator complex (GO:0016592)
GO function:transcription coregulator activity (GO:0003712)

This is a PFAM domain. For full annotation and more information, please see the PFAM entry Med8