Difference between revisions of "CTD Phosphorylation"
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== Introduction == | == Introduction == | ||
Revision as of 17:57, 14 March 2014
Main_page:CTD_Phosphorylation
Introduction
The CTD is the site of multiple phosphorylations, with up to five potential phosphorylation sites in a consensus hep- tapeptide repeat (Y1, S2, T4, S5, S7). However, in vivo phos- phorylation occurs mainly on serine residues. The hyperphosphorylated form of the mammalian CTD has on average 1 phosphate/repeat [21], although the number of phosphates on the CTD at any point of the transcription cycle has not yet been determined.
(I will figure out how to upload a figure).
Below is the list of known phosphatases and kinases involved in CTD phosphorylation [1].
Phosphatases
| Mammals | Yeast | Group | Family | Substrate | Stage | Evolution (from yeast to human) | Note |
|---|---|---|---|---|---|---|---|
| FCP1 | FCP1 | HAD | FCP | pSer2 | To Recycling | From yeast to human | |
| SCP | SCP | HAD | FCP | pSer5 | To cleavage, polyA and termination | From yeast to human | The function toward pSer5 of one of its member, SCP1, has been verified in mammals, but not in yeast, yet. |
| SSU72 | SSU72 | Cys-based II | SSU72 | pSer5 | To cleavage, polyA and termination | From yeast to human | 1) Its function toward pSer5 has been verified in yeast, but not mammals. 2) Unlike other phosphatases, it has a fold similar to LMWPTP rather than HAD. |
| HSPC129 | N/A | HAD | FCP | ? | ? | From Monosiga to human but lost in fly | 1) In vitro activity toward CTD. 2) HSPC129 was divergent from SCP family. |
| UBLCP1 | N/A | HAD | SCP | ? | ? | From anemone to human but lost in nematode | 1) In vitro activity toward CTD. |
| ? | N/A | ? | ? | pSer7 | ? | ? | Observed phosphorylated pSer7, but the phosphatase and kinase are unknown. |
Kinases
| Mammals | Yeast | Group | Family | Subfamily | Substrate | Stage | Evolution | Note |
|---|---|---|---|---|---|---|---|---|
| CDK7 | KIN28 | CMGC | CDK | CDK7 | Ser5 | To initiation | From yeast to human but lost in Monosiga? | 1) CDK7 is a component of transcription factor TFIIH. 2) KinBase shows it is absent from Monosiga. |
| CDK9 | Bur1 | CMGC | CDK | CDK9 | Ser2 | To elongation | From yeast to human but lost in Monosiga? | 1) CDK9 is the catalytic subunit of the positive transcription elongation factor (P-TEF)b complex. 2) KinBase shows it is absent from Monosiga. |
| CRK7 | CTK1 | CMGC | CDK | CRK7 | Ser2 | To elongation | From Giardia to human but lost in Tetrahymena | It has been verified in yeast, but not in mammals. |
| CDK8 | CDK8 | CMGC | CDK | CDK8 | Ser2 and Ser5 | In the pool of pol II? | From yeast to human | |
| CDC2 | CDK1 | CMGC | CDK | CDC2 | Ser2 and Ser5 | In the pool of pol II? | From Giardia to human | In KInbase, conserved in yeast in the tree, but absent in the hits. |
| ERK1/2 | FUS3, KSS1, SLT2, SMK1, YKL161C | CMGC | MAPK | ERK1 | Ser5 | In the pool of pol II? | From Monosiga to human | Many yeast proteins in this subfamily of extracellular signal-related kinase 1/2 (ERK1 in KinBase). |
| ? | ? | ? | ? | ? | Ser7 | ? | ? | ? |
References
- Buratowski S. Progression through the RNA polymerase II CTD cycle. Mol Cell. 2009 Nov 25;36(4):541-6. DOI:10.1016/j.molcel.2009.10.019 |
- Akhtar MS, Heidemann M, Tietjen JR, Zhang DW, Chapman RD, Eick D, and Ansari AZ. TFIIH kinase places bivalent marks on the carboxy-terminal domain of RNA polymerase II. Mol Cell. 2009 May 15;34(3):387-93. DOI:10.1016/j.molcel.2009.04.016 |
- Tietjen JR, Zhang DW, Rodríguez-Molina JB, White BE, Akhtar MS, Heidemann M, Li X, Chapman RD, Shokat K, Keles S, Eick D, and Ansari AZ. Chemical-genomic dissection of the CTD code. Nat Struct Mol Biol. 2010 Sep;17(9):1154-61. DOI:10.1038/nsmb.1900 |
- Kim H, Erickson B, Luo W, Seward D, Graber JH, Pollock DD, Megee PC, and Bentley DL. Gene-specific RNA polymerase II phosphorylation and the CTD code. Nat Struct Mol Biol. 2010 Oct;17(10):1279-86. DOI:10.1038/nsmb.1913 |
- Yang XJ. Multisite protein modification and intramolecular signaling. Oncogene. 2005 Mar 3;24(10):1653-62. DOI:10.1038/sj.onc.1208173 |
- Chapman RD, Heidemann M, Hintermair C, and Eick D. Molecular evolution of the RNA polymerase II CTD. Trends Genet. 2008 Jun;24(6):289-96. DOI:10.1016/j.tig.2008.03.010 |
- Stiller JW and Hall BD. Evolution of the RNA polymerase II C-terminal domain. Proc Natl Acad Sci U S A. 2002 Apr 30;99(9):6091-6. DOI:10.1073/pnas.082646199 |
- Egloff S and Murphy S. Cracking the RNA polymerase II CTD code. Trends Genet. 2008 Jun;24(6):280-8. DOI:10.1016/j.tig.2008.03.008 |
