P40356 · MED3_YEAST
- ProteinMediator of RNA polymerase II transcription subunit 3
- GenePGD1
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids397 (go to sequence)
- Protein existenceEvidence at protein level
- Annotation score5/5
Function
function
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. PGD1/MED3 is also involved in direct repeat recombination.
Miscellaneous
Present with 556 molecules/cell in log phase SD medium.
GO annotations
all annotations | all molecular function | virus receptor activity | dna binding | rna binding | cytoskeletal motor activity | catalytic activity | gtpase activity | structural molecule activity | transporter activity | cytoskeletal protein binding | lipid binding | cyclase activity | antioxidant activity | oxidoreductase activity | transferase activity | hydrolase activity | lyase activity | isomerase activity | ligase activity | protein tag activity | cargo receptor activity | histone binding | protein folding chaperone | translation regulator activity | nutrient reservoir activity | receptor ligand activity | molecular transducer activity | molecular adaptor activity | toxin activity | cell adhesion mediator activity | molecular function regulator activity | virus coreceptor activity | catalytic activity, acting on a protein | catalytic activity, acting on dna | catalytic activity, acting on rna | molecular carrier activity | transcription regulator activity | general transcription initiation factor activity | molecular sensor activity | molecular sequestering activity | atp-dependent activity | other molecular function | all biological process | mitotic cell cycle | cytokinesis | cytoplasmic translation | immune system process | muscle system process | circulatory system process | renal system process | respiratory system process | carbohydrate metabolic process | generation of precursor metabolites and energy | dna replication | dna repair | dna recombination | chromatin organization | dna-templated transcription | regulation of dna-templated transcription | trna metabolic process | protein folding | protein glycosylation | amino acid metabolic process | modified amino acid metabolic process | lipid metabolic process | vitamin metabolic process | sulfur compound metabolic process | intracellular protein transport | nucleocytoplasmic transport | autophagy | inflammatory response | mitochondrion organization | cytoskeleton organization | microtubule-based movement | peroxisome organization | lysosome organization | chromosome segregation | cell adhesion | establishment or maintenance of cell polarity | programmed cell death | photosynthesis | mrna metabolic process | snrna metabolic process | vesicle-mediated transport | reproductive process | digestive system process | signaling | cell differentiation | protein catabolic process | extracellular matrix organization | regulatory ncrna-mediated gene silencing | telomere organization | cell junction organization | wound healing | ribosome biogenesis | cilium organization | anatomical structure development | cell motility | nervous system process | endocrine process | protein maturation | transmembrane transport | nucleobase-containing small molecule metabolic process | hepaticobiliary system process | membrane organization | protein-containing complex assembly | cell wall organization or biogenesis | nitrogen cycle metabolic process | protein localization to plasma membrane | defense response to other organism | detoxification | meiotic nuclear division | mitotic nuclear division | mitochondrial gene expression | carbohydrate derivative metabolic process | other biological process | all cellular component | nuclear chromosome | extracellular region | extracellular space | cell wall | nucleus | nuclear envelope | nucleoplasm | chromosome | nucleolus | mitochondrion | lysosome | endosome | vacuole | peroxisome | endoplasmic reticulum | golgi apparatus | lipid droplet | microtubule organizing center | cytosol | ribosome | cytoskeleton | plasma membrane | cilium | plastid | thylakoid | external encapsulating structure | extracellular matrix | cytoplasmic vesicle | organelle | other cellular component | |||
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Aspect | Term | |
---|---|---|
Cellular Component | core mediator complex | |
Cellular Component | mediator complex | |
Cellular Component | nucleus | |
Molecular Function | RNA polymerase II core promoter sequence-specific DNA binding | |
Molecular Function | RNA polymerase II-specific DNA-binding transcription factor binding | |
Molecular Function | transcription coactivator activity | |
Biological Process | cellular response to heat | |
Biological Process | negative regulation of transcription by RNA polymerase II | |
Biological Process | positive regulation of transcription by RNA polymerase II | |
Biological Process | positive regulation of transcription elongation by RNA polymerase II | |
Biological Process | positive regulation of transcription initiation by RNA polymerase II | |
Biological Process | RNA polymerase II preinitiation complex assembly |
Keywords
- Molecular function
- Biological process
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameMediator of RNA polymerase II transcription subunit 3
- Alternative names
Gene names
Organism names
- Strains
- Taxonomic lineageEukaryota > Fungi > Dikarya > Ascomycota > Saccharomycotina > Saccharomycetes > Saccharomycetales > Saccharomycetaceae > Saccharomyces
Accessions
- Primary accessionP40356
- Secondary accessions
Proteomes
Organism-specific databases
Subcellular Location
PTM/Processing
Features
Showing features for modified residue, chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Modified residue | 1 | N-acetylmethionine | ||||
Sequence: M | ||||||
Chain | PRO_0000096382 | 1-397 | Mediator of RNA polymerase II transcription subunit 3 | |||
Sequence: MDSIIPAGVKLDDLQVILAKNENETRDKVCKQINEARDEILPLRLQFNEFIQIMANIDQEGSKQADRMAKYLHIRDKILQLNDRFQTLSSHLEALQPLFSTVPEYLKTADNRDRSFQLLEPLSTYNKNGNAVCSTATVVSTNHSAAASTPTTTATPHANPITHAHSLSNPNSTATMQHNPLAGKRGPKSGSTMGTPTVHNSTAAAPIAAPKKPRKPRQTKKAKAQAQAQAQAQAQVYAQQSTVQTPITASMAAALPNPTPSMINSVSPTNVMGTPLTNMMSPMGNAYSMGAQNQGGQVSMSQFNGSGNGSNPNTNTNSNNTPLQSQLNLNNLTPANILNMSMNNDFQQQQQQQQQQQQPQPQYNMNMGMNNMNNGGKELDSLDLNNLELGGLNMDFL |
Keywords
- PTM
Proteomic databases
PTM databases
Interaction
Subunit
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. PGD1/MED3 interacts directly with the CYC8-TUP1 corepressor proteins.
Binary interactions
Type | Entry 1 | Entry 2 | Number of experiments | Intact | |
---|---|---|---|---|---|
BINARY | P40356 | CYC8 P14922 | 3 | EBI-13268, EBI-18215 | |
BINARY | P40356 | TUP1 P16649 | 3 | EBI-13268, EBI-19654 |
Protein-protein interaction databases
Miscellaneous
Structure
Family & Domains
Features
Showing features for compositional bias, region.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Compositional bias | 147-179 | Polar residues | ||||
Sequence: ASTPTTTATPHANPITHAHSLSNPNSTATMQHN | ||||||
Region | 147-227 | Disordered | ||||
Sequence: ASTPTTTATPHANPITHAHSLSNPNSTATMQHNPLAGKRGPKSGSTMGTPTVHNSTAAAPIAAPKKPRKPRQTKKAKAQAQ | ||||||
Region | 288-327 | Disordered | ||||
Sequence: SMGAQNQGGQVSMSQFNGSGNGSNPNTNTNSNNTPLQSQL | ||||||
Region | 346-370 | Disordered | ||||
Sequence: FQQQQQQQQQQQQPQPQYNMNMGMN |
Sequence similarities
Belongs to the mediator complex subunit 3 family.
Phylogenomic databases
Family and domain databases
Sequence
- Sequence statusComplete
- Length397
- Mass (Da)43,079
- Last updated2005-10-25 v2
- Checksum69D60CE55EA30F18
Sequence caution
Features
Showing features for compositional bias, sequence conflict.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Compositional bias | 147-179 | Polar residues | ||||
Sequence: ASTPTTTATPHANPITHAHSLSNPNSTATMQHN | ||||||
Sequence conflict | 158 | in Ref. 5; AAT92986 | ||||
Sequence: A → T |
Keywords
- Technical term
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
X81457 EMBL· GenBank· DDBJ | CAA57213.1 EMBL· GenBank· DDBJ | Genomic DNA | Different initiation | |
Z26254 EMBL· GenBank· DDBJ | CAA81213.1 EMBL· GenBank· DDBJ | Genomic DNA | Different initiation | |
Z72547 EMBL· GenBank· DDBJ | CAA96725.1 EMBL· GenBank· DDBJ | Genomic DNA | Different initiation | |
AY692967 EMBL· GenBank· DDBJ | AAT92986.1 EMBL· GenBank· DDBJ | Genomic DNA | Different initiation | |
BK006941 EMBL· GenBank· DDBJ | DAA08074.1 EMBL· GenBank· DDBJ | Genomic DNA |