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Deciphering the RNA polymerase II CTD code in fission yeast.
1Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY 10065, USA.
Molecular Cell
|June 21, 2011
Summary
The RNA polymerase II carboxy-terminal domain (CTD) phosphorylation pattern is key to gene transcription. Altering serine phosphorylation sites reveals how the CTD code directs transcription factor interactions and essential cellular processes.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- The RNA polymerase II carboxy-terminal domain (CTD) features tandem repeats crucial for transcription.
- Dynamic phosphorylation of the CTD's serine residues acts as a signaling mechanism for the transcription machinery.
- Understanding the 'CTD code' is vital for deciphering gene expression regulation.
Purpose of the Study:
- To genetically dissect fission yeast CTD function and elucidate the 'CTD code'.
- To investigate the roles of specific serine phosphorylation sites (Ser2 and Ser5) in transcription.
- To understand how CTD modifications influence transcription factor recruitment and cellular processes.
Main Methods:
- Genetic manipulation of serine phosphorylation sites in the fission yeast CTD.
- Analysis of transcription during sexual differentiation and vegetative growth under altered CTD phosphorylation.
- Biochemical assays to assess mRNA capping enzyme recruitment to the CTD.
Main Results:
- The requirement for Ser2 in sexual differentiation transcription can be bypassed by removing Ser7, indicating phosphorylation imbalance is pathogenic.
- Ser5's essentiality for vegetative growth is circumvented by tethering mRNA capping enzymes, highlighting Ser5-PO(4) role in recruitment.
- These findings demonstrate that specific CTD phosphorylation marks act as critical signals for distinct cellular functions.
Conclusions:
- The CTD code is interpreted through the dynamic pattern of serine phosphorylation.
- Imbalances in CTD phosphorylation, not just absence of a mark, can lead to functional defects.
- Key CTD phosphorylation marks can be functionally compensated by alternative recruitment pathways for essential factors.
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