| Structural highlights
Function
[RPA43_YEAST] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Component of RNA polymerase I which synthesizes ribosomal RNA precursors. Through its association with RRN3 is involved in recruitment of Pol I to rDNA promoters. In vitro, the A13-A43 subcomplex binds single-stranded RNA.[1] [2] [RPA14_YEAST] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Component of RNA polymerase I which synthesizes ribosomal RNA precursors. A14 seems to play a role in the stability of subunits ABC23 and A43. In vitro, the A14-A43 subcomplex binds single-stranded RNA.[3]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Synthesis of ribosomal RNA (rRNA) by RNA polymerase (Pol) I is the first step in ribosome biogenesis and a regulatory switch in eukaryotic cell growth. Here we report the 12 A cryo-electron microscopic structure for the complete 14-subunit yeast Pol I, a homology model for the core enzyme, and the crystal structure of the subcomplex A14/43. In the resulting hybrid structure of Pol I, A14/43, the clamp, and the dock domain contribute to a unique surface interacting with promoter-specific initiation factors. The Pol I-specific subunits A49 and A34.5 form a heterodimer near the enzyme funnel that acts as a built-in elongation factor and is related to the Pol II-associated factor TFIIF. In contrast to Pol II, Pol I has a strong intrinsic 3'-RNA cleavage activity, which requires the C-terminal domain of subunit A12.2 and, apparently, enables ribosomal RNA proofreading and 3'-end trimming.
Functional architecture of RNA polymerase I.,Kuhn CD, Geiger SR, Baumli S, Gartmann M, Gerber J, Jennebach S, Mielke T, Tschochner H, Beckmann R, Cramer P Cell. 2007 Dec 28;131(7):1260-72. PMID:18160037[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Peyroche G, Milkereit P, Bischler N, Tschochner H, Schultz P, Sentenac A, Carles C, Riva M. The recruitment of RNA polymerase I on rDNA is mediated by the interaction of the A43 subunit with Rrn3. EMBO J. 2000 Oct 16;19(20):5473-82. PMID:11032814 doi:http://dx.doi.org/10.1093/emboj/19.20.5473
- ↑ Meka H, Daoust G, Arnvig KB, Werner F, Brick P, Onesti S. Structural and functional homology between the RNAP(I) subunits A14/A43 and the archaeal RNAP subunits E/F. Nucleic Acids Res. 2003 Aug 1;31(15):4391-400. PMID:12888498
- ↑ Meka H, Daoust G, Arnvig KB, Werner F, Brick P, Onesti S. Structural and functional homology between the RNAP(I) subunits A14/A43 and the archaeal RNAP subunits E/F. Nucleic Acids Res. 2003 Aug 1;31(15):4391-400. PMID:12888498
- ↑ Kuhn CD, Geiger SR, Baumli S, Gartmann M, Gerber J, Jennebach S, Mielke T, Tschochner H, Beckmann R, Cramer P. Functional architecture of RNA polymerase I. Cell. 2007 Dec 28;131(7):1260-72. PMID:18160037 doi:10.1016/j.cell.2007.10.051
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