4v8t

Cryo-EM Structure of the 60S Ribosomal Subunit in Complex with Arx1 and Rei1Cryo-EM Structure of the 60S Ribosomal Subunit in Complex with Arx1 and Rei1

4v8t, resolution 8.10Å Show:Asymmetric Unit Biological Assembly Structural highlights 4v8t is a 10 chain structure with sequence from Saccharomyces cerevisiae S288C. This structure supersedes the now removed PDB entries 4b6a and 4b6b. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 8.1Å Ligands: Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RL2A_YEAST Publication Abstract from PubMed Eukaryotic ribosome biogenesis requires many protein factors that facilitate the assembly, nuclear export and final maturation of 40S and 60S particles. We have biochemically characterized ribosomal complexes of the yeast 60S-biogenesis factor Arx1 and late-maturation factors Rei1 and Jjj1 and determined their cryo-EM structures. Arx1 was visualized bound to the 60S subunit together with Rei1, at 8.1-A resolution, to reveal the molecular details of Arx1 binding whereby Arx1 arrests the eukaryotic-specific rRNA expansion segment 27 near the polypeptide tunnel exit. Rei1 and Jjj1, which have been implicated in Arx1 recycling, bind in the vicinity of Arx1 and form a network of interactions. We suggest that, in addition to the role of Arx1 during pre-60S nuclear export, the binding of Arx1 conformationally locks the pre-60S subunit and inhibits the premature association of nascent chain-processing factors to the polypeptide tunnel exit. Cryo-EM structures of Arx1 and maturation factors Rei1 and Jjj1 bound to the 60S ribosomal subunit.,Greber BJ, Boehringer D, Montellese C, Ban N Nat Struct Mol Biol. 2012 Nov 11. doi: 10.1038/nsmb.2425. PMID:23142985 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribosome 3D structures