Molecular Target Synopsis
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SRB5 (P32585) - Overview - Molecular Target Synopsis

Protein


SRB5, Mediator of RNA polymerase II transcription subunit 18
UniProt P32585

Also Known as MED18_YEAST, SRB5, MED18

Component of the Mediator complex, 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. 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. Component of the Mediator complex, which is composed of at least 21 subunits that form three structurally distinct submodules. The Mediator 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, and the tail module contains MED2, PGD1/MED3, RGR1/MED14, GAL11/MED15 and SIN4/MED16. The head and the middle modules interact directly with RNA polymerase II, whereas the elongated tail module interacts with gene-specific regulatory proteins. SRB5/MED18 interacts directly with MED8 and SRB2/MED20.

5OQM
STRUCTURE OF YEAST TRANSCRIPTION PRE-INITIATION COMPLEX WITH TFIIH AND CORE MEDIATOR
RCSB/PDB
Inspect Structure
See all 3D Structures for SRB5

Isoforms / Transcripts (Protein Coding)


Protein Length Ensembl Gene Ensembl Transcript Ensembl Protein Uniprot Isoform
307P32585-1

Sub-cellular localization


UniProt: SRB5 is active in the following subcellular-locations: nucleus.
GO terms: SRB5 is active in the following subcellular-locations: core mediator complex, mediator complex.



UniProt
GO terms

Gene Copy Number Variation


In COSMIC - Cell Lines Project SRB5 has gain in 0 cell-lines, loss in 0 cell-lines and no signal in 0 cell-lines. (see details)

3D Structures


For SRB5 there are:
9 structures (17 chains) solved
0 are solved in complex with at least one small molecule ligand



(see details)
Molecular Target 3D Synopsis