| Structural highlights
Function
[RRN6_YEAST] Acts as component of the core factor (CF) complex which is essential for the initiation of rDNA transcription by RNA polymerase I. After binding of UAF (upstream activation factor) to an upstream element of the promoter, CF is recruited in a SPT15/TBP-dependent manner to form a preinitiation complex.[1] [RRN11_YEAST] Acts as component of the core factor (CF) complex which is essential for the initiation of rDNA transcription by RNA polymerase I. After binding of UAF (upstream activation factor) to an upstream element of the promoter, CF is recruited in a SPT15/TBP-dependent manner to form a preinitiation complex.[2] [RRN7_YEAST] Component of RNA polymerase I core factor complex (CF) that acts as a SUA7/TFIIB-like factor and plays a key role in multiple steps during transcription initiation such as pre-initiation complex (PIC) assembly and postpolymerase recruitment events in polymerase I (Pol I) transcription. Binds rDNA promoters and plays a role in Pol I recruitment. After binding of UAF (upstream activation factor) to an upstream element of the promoter, CF is recruited in a SPT15/TBP-dependent manner to form a pre-initiation complex.[3] [4] [5]
Publication Abstract from PubMed
Transcription initiation at the ribosomal RNA promoter requires RNA polymerase (Pol) I and the initiation factors Rrn3 and core factor (CF). Here, we combine X-ray crystallography and cryo-electron microscopy (cryo-EM) to obtain a molecular model for basal Pol I initiation. The three-subunit CF binds upstream promoter DNA, docks to the Pol I-Rrn3 complex, and loads DNA into the expanded active center cleft of the polymerase. DNA unwinding between the Pol I protrusion and clamp domains enables cleft contraction, resulting in an active Pol I conformation and RNA synthesis. Comparison with the Pol II system suggests that promoter specificity relies on a distinct "bendability" and "meltability" of the promoter sequence that enables contacts between initiation factors, DNA, and polymerase.
Structural Basis of RNA Polymerase I Transcription Initiation.,Engel C, Gubbey T, Neyer S, Sainsbury S, Oberthuer C, Baejen C, Bernecky C, Cramer P Cell. 2017 Mar 23;169(1):120-131.e22. doi: 10.1016/j.cell.2017.03.003. PMID:28340337[6]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Lin CW, Moorefield B, Payne J, Aprikian P, Mitomo K, Reeder RH. A novel 66-kilodalton protein complexes with Rrn6, Rrn7, and TATA-binding protein to promote polymerase I transcription initiation in Saccharomyces cerevisiae. Mol Cell Biol. 1996 Nov;16(11):6436-43. PMID:8887672
- ↑ Lin CW, Moorefield B, Payne J, Aprikian P, Mitomo K, Reeder RH. A novel 66-kilodalton protein complexes with Rrn6, Rrn7, and TATA-binding protein to promote polymerase I transcription initiation in Saccharomyces cerevisiae. Mol Cell Biol. 1996 Nov;16(11):6436-43. PMID:8887672
- ↑ Knutson BA, Hahn S. Yeast Rrn7 and human TAF1B are TFIIB-related RNA polymerase I general transcription factors. Science. 2011 Sep 16;333(6049):1637-40. doi: 10.1126/science.1207699. PMID:21921198 doi:http://dx.doi.org/10.1126/science.1207699
- ↑ Blattner C, Jennebach S, Herzog F, Mayer A, Cheung AC, Witte G, Lorenzen K, Hopfner KP, Heck AJ, Aebersold R, Cramer P. Molecular basis of Rrn3-regulated RNA polymerase I initiation and cell growth. Genes Dev. 2011 Sep 22. PMID:21940764 doi:10.1101/gad.17363311
- ↑ Lin CW, Moorefield B, Payne J, Aprikian P, Mitomo K, Reeder RH. A novel 66-kilodalton protein complexes with Rrn6, Rrn7, and TATA-binding protein to promote polymerase I transcription initiation in Saccharomyces cerevisiae. Mol Cell Biol. 1996 Nov;16(11):6436-43. PMID:8887672
- ↑ Engel C, Gubbey T, Neyer S, Sainsbury S, Oberthuer C, Baejen C, Bernecky C, Cramer P. Structural Basis of RNA Polymerase I Transcription Initiation. Cell. 2017 Mar 23;169(1):120-131.e22. doi: 10.1016/j.cell.2017.03.003. PMID:28340337 doi:http://dx.doi.org/10.1016/j.cell.2017.03.003
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