Investigating RNA polymerase II carboxyl-terminal domain (CTD) phosphorylation
Authors: Palancade, Benoît1; Bensaude, Olivier1
Source: FEBS Journal, Volume 270, Number 19, October 2003 , pp. 3859-3870(12)
Publisher: Blackwell Publishing
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Abstract:
Phosphorylation of RNA polymerase II's largest subunit C-terminal domain (CTD) is a key event during mRNA metabolism. Numerous enzymes, including cell cycle-dependent kinases and TFIIF-dependent phosphatases target the CTD. However, the repetitive nature of the CTD prevents determination of phosphorylated sites by conventional biochemistry methods. Fortunately, a panel of monoclonal antibodies is available that distinguishes between phosphorylated isoforms of RNA polymerase II's (RNAP II) largest subunit. Here, we review how successful these tools have been in monitoring RNAP II phosphorylation changes in vivo by immunofluorescence, chromatin immunoprecipitation and immunoblotting experiments. The CTD phosphorylation pattern is precisely modified as RNAP II progresses along the genes and is involved in sequential recruitment of RNA processing factors. One of the most popular anti-phosphoCTD Igs, H5, has been proposed in several studies as a landmark of RNAP II molecules engaged in transcription. Finally, we discuss how global RNAP II phosphorylation changes are affected by the physiological context such as cell stress and embryonic development.Keywords: RNA polymerase II; CTD-phosphorylation; CTD-kinase; CTD-phosphatase; transcription; mRNA processing
Document Type: Review article
DOI: 10.1046/j.1432-1033.2003.03794.x
Affiliations: 1: Génétique Moléculaire, UMR 8541 CNRS, Ecole Normale Supérieure, Paris, France
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