Transcription by RNA polymerase II (Pol II) can be repressed by noncoding RNA, including the human RNA Alu. However, the mechanism by which endogenous RNAs repress transcription remains unclear. Here we present cryo-electron microscopy structures of Pol II bound to Alu RNA, which reveal that Alu RNA mimics how DNA and RNA bind to Pol II during transcription elongation. Further, we show how domains of the general transcription factor TFIIF affect complex dynamics and control repressive activity. Together, we reveal how a non-coding RNA can regulate mammalian gene expression.
We thank B. Kaczmarek and other members of the Bernecky lab for helpful discussions. We thank V.-V. Hodirnau for SerialEM data collection and support with EPU data collection. We thank D. Slade for the wild type TFIIF expression plasmid. We thank N. Thompson and R. Burgess for the 8WG16 hybridoma cell line. We thank C. Plaschka and M. Loose for critical reading of the manuscript. This work was supported by Austrian Science Fund (FWF) grant P34185. This research was further supported by the Scientific Service Units (SSU) of IST Austria through resources provided by the Lab Support Facility (LSF), Electron Microscopy Facility (EMF), Scientific Computing (SciComp), and the Preclinical Facility (PCF).
Tluckova K, Testa Salmazo AP, Bernecky C. Mechanism of mammalian transcriptional repression by noncoding RNA. doi:10.15479/AT:ISTA:14644
Tluckova, K., Testa Salmazo, A. P., & Bernecky, C. (n.d.). Mechanism of mammalian transcriptional repression by noncoding RNA. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:14644
Tluckova, Katarina, Anita P Testa Salmazo, and Carrie Bernecky. “Mechanism of Mammalian Transcriptional Repression by Noncoding RNA.” Institute of Science and Technology Austria, n.d. https://doi.org/10.15479/AT:ISTA:14644.
K. Tluckova, A. P. Testa Salmazo, and C. Bernecky, “Mechanism of mammalian transcriptional repression by noncoding RNA.” Institute of Science and Technology Austria.
Tluckova K, Testa Salmazo AP, Bernecky C. Mechanism of mammalian transcriptional repression by noncoding RNA. 10.15479/AT:ISTA:14644.
Tluckova, Katarina, et al. Mechanism of Mammalian Transcriptional Repression by Noncoding RNA. Institute of Science and Technology Austria, doi:10.15479/AT:ISTA:14644.
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