5an9

Mechanism of eIF6 release from the nascent 60S ribosomal subunitMechanism of eIF6 release from the nascent 60S ribosomal subunit

5an9, resolution 3.30Å Show:Asymmetric Unit Biological Assembly Structural highlights 5an9 is a 10 chain structure with sequence from Dictyostelium discoideum and Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.3Å Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RL3_DICDI The L3 protein is a component of the large subunit of cytoplasmic ribosomes. Publication Abstract from PubMed SBDS protein (deficient in the inherited leukemia-predisposition disorder Shwachman-Diamond syndrome) and the GTPase EFL1 (an EF-G homolog) activate nascent 60S ribosomal subunits for translation by catalyzing eviction of the antiassociation factor eIF6 from nascent 60S ribosomal subunits. However, the mechanism is completely unknown. Here, we present cryo-EM structures of human SBDS and SBDS-EFL1 bound to Dictyostelium discoideum 60S ribosomal subunits with and without endogenous eIF6. SBDS assesses the integrity of the peptidyl (P) site, bridging uL16 (mutated in T-cell acute lymphoblastic leukemia) with uL11 at the P-stalk base and the sarcin-ricin loop. Upon EFL1 binding, SBDS is repositioned around helix 69, thus facilitating a conformational switch in EFL1 that displaces eIF6 by competing for an overlapping binding site on the 60S ribosomal subunit. Our data reveal the conserved mechanism of eIF6 release, which is corrupted in both inherited and sporadic leukemias. Mechanism of eIF6 release from the nascent 60S ribosomal subunit.,Weis F, Giudice E, Churcher M, Jin L, Hilcenko C, Wong CC, Traynor D, Kay RR, Warren AJ Nat Struct Mol Biol. 2015 Nov;22(11):914-9. doi: 10.1038/nsmb.3112. Epub 2015 Oct, 19. PMID:26479198 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Eukaryotic initiation factor 3D structures Ribosome 3D structures Shwachman-Bodian-Diamond Syndrome Protein