Download MendeleyCrystal Structure of the 14-Subunit RNA Polymerase I
Fernandez-Tornero, C., Moreno-Morcillo, M., Rashid, U.J., Taylor, N.M.I., Ruiz, F.M., Gruene, T., Legrand, P., Steuerwald, U., Muller, C.W.(2013) Nature 502: 644
- PubMed: 24153184
- DOI: https://doi.org/10.1038/nature12636
- Primary Citation of Related Structures:
4C3H, 4C3I, 4C3J - PubMed Abstract:
Protein biosynthesis depends on the availability of ribosomes, which in turn relies on ribosomal RNA production. In eukaryotes, this process is carried out by RNA polymerase I (Pol I), a 14-subunit enzyme, the activity of which is a major determinant of cell growth. Here we present the crystal structure of Pol I from Saccharomyces cerevisiae at 3.0 Å resolution. The Pol I structure shows a compact core with a wide DNA-binding cleft and a tightly anchored stalk. An extended loop mimics the DNA backbone in the cleft and may be involved in regulating Pol I transcription. Subunit A12.2 extends from the A190 jaw to the active site and inserts a transcription elongation factor TFIIS-like zinc ribbon into the nucleotide triphosphate entry pore, providing insight into the role of A12.2 in RNA cleavage and Pol I insensitivity to α-amanitin. The A49-A34.5 heterodimer embraces subunit A135 through extended arms, thereby contacting and potentially regulating subunit A12.2.
Organizational Affiliation:
1] Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu 9, 28040 Madrid, Spain [2].
