5jbh

Cryo-EM structure of a full archaeal ribosomal translation initiation complex in the P-IN conformation

Loading... Status: waiting for Mol* initialization Structural highlights 5jbh is a 10 chain structure with sequence from Escherichia coli and Pyrococcus abyssi GE5. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 5.34Å Ligands: 5MU, GNP, H2U, MET, MG, OMC, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Eukaryotic and archaeal translation initiation complexes have a common structural core comprising e/aIF1, e/aIF1A, the ternary complex (TC, e/aIF2-GTP-Met-tRNAiMet) and mRNA bound to the small ribosomal subunit. e/aIF2 plays a crucial role in this process but how this factor controls start codon selection remains unclear. Here, we present cryo-EM structures of the full archaeal 30S initiation complex showing two conformational states of the TC. In the first state, the TC is bound to the ribosome in a relaxed conformation with the tRNA oriented out of the P site. In the second state, the tRNA is accommodated within the peptidyl (P) site and the TC becomes constrained. This constraint is compensated by codon/anticodon base pairing, whereas in the absence of a start codon, aIF2 contributes to swing out the tRNA. This spring force concept highlights a mechanism of codon/anticodon probing by the initiator tRNA directly assisted by aIF2. Cryo-EM study of start codon selection during archaeal translation initiation.,Coureux PD, Lazennec-Schurdevin C, Monestier A, Larquet E, Cladiere L, Klaholz BP, Schmitt E, Mechulam Y Nat Commun. 2016 Nov 7;7:13366. doi: 10.1038/ncomms13366. PMID:27819266 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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