RGD Reference Report - Comparative TFIIS-mediated transcript cleavage by mammalian RNA polymerase II arrested at a lesion in different transcription systems. - Rat Genome Database

Send us a Message



Submit Data |  Help |  Video Tutorials |  News |  Publications |  Download |  REST API |  Citing RGD |  Contact   

Comparative TFIIS-mediated transcript cleavage by mammalian RNA polymerase II arrested at a lesion in different transcription systems.

Authors: Kalogeraki, VS  Tornaletti, S  Cooper, PK  Hanawalt, PC 
Citation: Kalogeraki VS, etal., DNA Repair (Amst). 2005 Sep 28;4(10):1075-87.
RGD ID: 9693728
Pubmed: (View Article at PubMed) PMID:16046193
DOI: Full-text: DOI:10.1016/j.dnarep.2005.05.007

Upon prolonged arrest at a cyclobutane pyrimidine dimer (CPD), RNAPII can reverse-translocate, misaligning the 3'-end of the RNA from its active site. Transcription factor SII (TFIIS) is required for cleavage of the disengaged 3'-end and restoration of its correct positioning. We have previously shown in vitro that when RNAPII is arrested at a CPD, TFIIS-induced cleavage results in shortened transcripts. Here, we hypothesized that the pattern of transcript cleavage does not depend solely upon TFIIS itself, but also on some other general transcription factors (GTFs) and/or their effects on RNAPII. To test this hypothesis we compared three in vitro transcription systems which differ with respect to the mode of initiation and the requirement for GTFs. The first consisted of RNAPII and GTFs from rat liver, and required a eukaryotic promoter for initiation. The other two supported transcription in the absence of any GTFs or promoter sequences. In each case, a CPD on the transcribed strand was a complete block for RNAPII translocation. However, the effect of TFIIS on transcript cleavage varied. In the promoter-initiated system, distinct transcripts up to about 20 nucleotides shorter than the uncleaved original one were produced. In the other two systems, the transcripts were degraded nearly completely. Introduction of GTFs partially interfered with cleavage, but failed to reproduce the pattern of transcript lengths observed with the promoter-initiated system. Our results suggest that the extent of TFIIS-mediated transcript cleavage is a well-orchestrated process, depending upon other factors (or their effects on RNAPII), in addition to TFIIS itself.

Annotation

Gene Ontology Annotations    

Biological Process

Objects Annotated

Genes (Rattus norvegicus)
Tcea1  (transcription elongation factor A1)


Additional Information