Abstract:
:Numerous links exist between co-transcriptional RNA processing and the transcribing RNAPII. In particular, pre-mRNA splicing was reported to be associated with slowed RNAPII elongation. Here, we identify a site of ubiquitination (K1246) in the catalytic subunit of RNAPII close to the DNA entry path. Ubiquitination was increased in the absence of the Bre5-Ubp3 ubiquitin protease complex. Bre5 binds RNA in vivo, with a preference for exon 2 regions of intron-containing pre-mRNAs and poly(A) proximal sites. Ubiquitinated RNAPII showed similar enrichment. The absence of Bre5 led to impaired splicing and defects in RNAPII elongation in vivo on a splicing reporter construct. Strains expressing RNAPII with a K1246R mutation showed reduced co-transcriptional splicing. We propose that ubiquinitation of RNAPII is induced by RNA processing events and linked to transcriptional pausing, which is released by Bre5-Ubp3 associated with the nascent transcript.
journal_name
Elifejournal_title
eLifeauthors
Milligan L,Sayou C,Tuck A,Auchynnikava T,Reid JE,Alexander R,Alves FL,Allshire R,Spanos C,Rappsilber J,Beggs JD,Kudla G,Tollervey Ddoi
10.7554/eLife.27082subject
Has Abstractpub_date
2017-10-13 00:00:00issn
2050-084Xpii
27082journal_volume
6pub_type
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