5mc6

Cryo-EM structure of a native ribosome-Ski2-Ski3-Ski8 complex from S. cerevisiaeCryo-EM structure of a native ribosome-Ski2-Ski3-Ski8 complex from S. cerevisiae

5mc6, resolution 3.80Å Show:Asymmetric Unit Biological Assembly Structural highlights 5mc6 is a 10 chain structure with sequence from Saccharomyces cerevisiae S288C. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.8Å Ligands: Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RL31A_YEAST Publication Abstract from PubMed Ski2-Ski3-Ski8 (Ski) is a helicase complex functioning with the RNA-degrading exosome to mediate the 3'-5' messenger RNA (mRNA) decay in turnover and quality-control pathways. We report that the Ski complex directly associates with 80S ribosomes presenting a short mRNA 3' overhang. We determined the structure of an endogenous ribosome-Ski complex using cryo-electron microscopy (EM) with a local resolution of the Ski complex ranging from 4 angstroms (A) in the core to about 10 A for intrinsically flexible regions. Ribosome binding displaces the autoinhibitory domain of the Ski2 helicase, positioning it in an open conformation near the ribosomal mRNA entry tunnel. We observe that the mRNA 3' overhang is threaded directly from the small ribosomal subunit to the helicase channel of Ski2, primed for ongoing exosome-mediated 3'-5' degradation. The cryo-EM structure of a ribosome-Ski2-Ski3-Ski8 helicase complex.,Schmidt C, Kowalinski E, Shanmuganathan V, Defenouillere Q, Braunger K, Heuer A, Pech M, Namane A, Berninghausen O, Fromont-Racine M, Jacquier A, Conti E, Becker T, Beckmann R Science. 2016 Dec 16;354(6318):1431-1433. PMID:27980209 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribosome 3D structures 3D sructureseceptor for activated protein kinase C 1