The Rpb4 subunit of RNA polymerase II contributes to cotranscriptional recruitment of 3' processing factors

Molecular and Cellular Biology
Vanessa M RunnerStephen Buratowski

Abstract

The RNA polymerase II enzyme from the yeast Saccharomyces cerevisiae is a complex of 12 subunits, Rpb1 to Rpb12. Crystal structures of the full complex show that the polymerase consists of two separable components, a 10-subunit core including the catalytic active site and a heterodimer of the Rpb4 and Rpb7 subunits. To characterize the role of the Rpb4/7 heterodimer during transcription in vivo, chromatin immunoprecipitation was used to examine an rpb4Delta strain for effects on the behavior of the core polymerase as well as recruitment of other protein factors involved in transcription. Rpb4/7 cross-links throughout transcribed regions. Loss of Rpb4 results in a reduction of RNA polymerase II levels near 3' ends of multiple mRNA genes as well as a decreased association of 3'-end processing factors. Furthermore, loss of Rpb4 results in altered polyadenylation site usage at the RNA14 gene. Together, these results indicate that Rpb4 contributes to proper cotranscriptional 3'-end processing in vivo.

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