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A kinase-cyclin pair in the RNA polymerase II holoenzyme.
- Source :
-
Nature [Nature] 1995 Mar 09; Vol. 374 (6518), pp. 193-6. - Publication Year :
- 1995
-
Abstract
- The RNA polymerase II holoenzyme consists of RNA polymerase II, a subset of general transcription factors, and regulatory proteins known as SRB proteins. The genes encoding SRB proteins were isolated as suppressors of mutations in the RNA polymerase II carboxy-terminal domain (CTD). The CTD and SRB proteins have been implicated in the response to transcriptional regulators. We report here the isolation of two new SRB genes, SRB10 and SRB11, which encode kinase- and cyclin-like proteins, respectively. Genetic and biochemical evidence indicates that the SRB10 and SRB11 proteins form a kinase-cyclin pair in the holoenzyme. The SRB10/11 kinase is essential for a normal transcriptional response to galactose induction in vivo. Holoenzymes lacking SRB10/11 kinase function are strikingly deficient in CTD phosphorylation. Although defects in the kinase substantially affect transcription in vivo, purified holoenzymes lacking SRB10/11 kinase function do not show defects in defined in vitro transcription systems, suggesting that the factors necessary to elicit the regulatory role of the SRB10/11 kinase are missing in these systems. These results indicate that the SRB10/11 kinase is involved in CTD phosphorylation and suggest that this modification has a role in the response to transcriptional regulators in vivo.
- Subjects :
- Amino Acid Sequence
Cyclin-Dependent Kinase 8
Cyclin-Dependent Kinases physiology
Cyclins physiology
Fungal Proteins metabolism
Fungal Proteins physiology
Molecular Sequence Data
Mutation
Protein Serine-Threonine Kinases genetics
Protein Serine-Threonine Kinases physiology
RNA Polymerase II chemistry
RNA Polymerase II physiology
Saccharomyces cerevisiae enzymology
Saccharomyces cerevisiae genetics
Sequence Homology, Amino Acid
Transcription Factors metabolism
Transcription Factors physiology
Cyclin-Dependent Kinases genetics
Cyclins genetics
Fungal Proteins genetics
RNA Polymerase II genetics
Saccharomyces cerevisiae Proteins
Transcription Factors genetics
Transcription, Genetic physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0028-0836
- Volume :
- 374
- Issue :
- 6518
- Database :
- MEDLINE
- Journal :
- Nature
- Publication Type :
- Academic Journal
- Accession number :
- 7877695
- Full Text :
- https://doi.org/10.1038/374193a0