J. Cell Biol.
© The Rockefeller University Press
0021-9525/97/01/19/10 $2.00
Volume 136, Number 1, January 13, 1997 19-28

Splicing Factors Associate with Hyperphosphorylated RNA Polymerase II in the Absence of Pre-mRNA

Euikyung Kim, Lei Du,^* David B. Bregman, and Stephen L. Warren

Department of Pathology and ^* Department of Genetics, Yale University School of Medicine, New Haven, Connecticut 06510

The carboxy-terminal domain (CTD) of the largest subunit of RNA polymerase II (Pol II) contains multiple tandem copies of the consensus heptapeptide, TyrSerProThrSerProSer. Concomitant with transcription initiation the CTD is phosphorylated. Elongating polymerase has a hyperphosphorylated CTD, but the role of this modification is poorly understood. A recent study revealed that some hyperphosphorylated polymerase molecules (Pol IIo) are nonchromosomal, and hence transcriptionally unengaged (Bregman, D.B., L. Du, S. van der Zee, S.L. Warren. 1995. J. Cell Biol. 129: 287-298). Pol IIo was concentrated in discrete splicing factor domains, suggesting a possible relationship between CTD phosphorylation and splicing factors, but no evidence beyond immunolocalization data was provided to support this idea. Here, we show that Pol IIo co-immunoprecipitates with members of two classes of splicing factors, the Sm snRNPs and non-snRNP SerArg (SR) family proteins. Significantly, Pol IIo's association with splicing factors is maintained in the absence of pre-mRNA, and the polymerase need not be transcriptionally engaged. We also provide definitive evidence that hyperphosphorylation of Pol II's CTD is poorly correlated with its transcriptional activity. Using monoclonal antibodies (mAbs) H5 and H14, which are shown here to recognize phosphoepitopes on Pol II's CTD, we have quantitated the level of Pol IIo at different stages of the cell cycle. The level of Pol IIo is similar in interphase and mitotic cells, which are transcriptionally active and inactive, respectively. Finally, complexes containing Pol IIo and splicing factors can be prepared from mitotic as well as interphase cells. The experiments reported here establish that hyperphosphorylation of the CTD is a good indicator of polymerase's association with snRNP and SR splicing factors, but not of its transcriptional activity. Most importantly, the present study suggests that splicing factors may associate with the polymerase via the hyperphosphorylated CTD.

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