Splicing and transcription-associated proteins PSF and p54nrb/nonO bind to the RNA polymerase II CTD.
The carboxyl-terminal domain (CTD) of the largest subunit of eukaryotic RNA polymerase II ( pol II) plays an important role in promoting steps of pre-mRNA processing. To identify proteins in human cells that bind to the CTD and that could mediate its functions in pre-mRNA processing, we used the mouse CTD expressed in bacterial cells in affinity chromatography experiments. Two proteins present in HeLa cell extract, the splicing and transcription-associated factors, PSF and p54nrb/NonO, bound specifically and could be purified to virtual homogeneity by chromatography on immobilized CTD matrices. Both hypo- and hyperphosphorylated CTD matrices bound these proteins with similar selectivity. PSF and p54nrb/NonO also copurified with a holoenzyme form of pol II containing hypophosphorylated CTD and could be coimmunoprecipitated with antibodies specific for this and the hyperphosphorylated form of pol II. That PSF and p54nrb/NonO promoted the binding of RNA to immobilized CTD matrices suggested these proteins can interact with the CTD and RNA simultaneously. PSF and p54nrb/NonO may therefore provide a direct physical link between the pol II CTD and pre-mRNA processing components, at both the initiation and elongation phases of transcription.[1]References
- Splicing and transcription-associated proteins PSF and p54nrb/nonO bind to the RNA polymerase II CTD. Emili, A., Shales, M., McCracken, S., Xie, W., Tucker, P.W., Kobayashi, R., Blencowe, B.J., Ingles, C.J. RNA (2002) [Pubmed]
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