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| http://www.biopax.org/relea... | |
| http://www.biopax.org/relea... |
Meiotic mRNA stability protein kinase SSN3
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| http://www.biopax.org/relea... |
SSN3_YEAST
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| http://www.biopax.org/relea... | |
| http://www.biopax.org/relea... |
2.7.11.22,
2.7.11.23,
Cyclin-dependent kinase 8,
Suppressor of RNA polymerase B SRB10
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| http://www.biopax.org/relea... |
FUNCTION: Component of the SRB8-11 complex. The SRB8-11 complex is a regulatory module of the Mediator complex which is itself involved in regulation of basal and activated RNA polymerase II- dependent transcription. The SRB8-11 complex may be involved in the transcriptional repression of a subset of genes regulated by Mediator. It may inhibit the association of the Mediator complex with RNA polymerase II to form the holoenzyme complex. The SRB8-11 complex phosphorylates the C-terminal domain (CTD) of the largest subunit of RNA polymerase II RPB1 at serines 2 and 5. The SSN3/SRB10 and SSN8/SRB11 kinase-cyclin pair may also positively and negatively regulate numerous transcriptional activators in response to changes in nutritional and physiological conditions. Phosphorylates GCN4, promoting its ubiquitin-mediated degradation, and MSN2, promoting its nuclear exclusion. Phosphorylates STE12, thereby promoting its degradation and inhibition of filamentous growth. Phosphorylates GAL4, and this phosphorylation is required for efficient galactose-inducible transcription. Also phosphorylates BDF1 and the TAF2 subunit of the TFIID complex. CATALYTIC ACTIVITY: ATP + a protein = ADP + a phosphoprotein. CATALYTIC ACTIVITY: ATP + [DNA-directed RNA polymerase] = ADP + [DNA-directed RNA polymerase] phosphate. SUBUNIT: Component of the SRB8-11 complex which consists of SRB8, SSN2/SRB9, SSN3/SRB10 and SSN8/SRB11. The SRB8-11 complex associates with the Mediator complex. The SSN3/SRB10 and SSN8/SRB11 kinase-cyclin pair also associate with the RNA polymerase II holoenzyme. Interacts with TUP1. SUBCELLULAR LOCATION: Nucleus (Probable). INDUCTION: Protein level and kinase activity are reduced during nitrogen starvation. SIMILARITY: Belongs to the protein kinase superfamily. CMGC Ser/Thr protein kinase family. CDC2/CDKX subfamily. SIMILARITY: Contains 1 protein kinase domain. SEQUENCE CAUTION: Sequence=AAC13785.1; Type=Erroneous initiation; GENE SYNONYMS: ARE1 CDK8 GIG2 SRB10 UME5. COPYRIGHT: Protein annotation is derived from the UniProt Consortium (http://www.uniprot.org/). Distributed under the Creative Commons Attribution-NoDerivs License.
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