7zah | pdb_00007zah

Cryo-EM structure of an archaeal aIF5B bound to the ssu translation initiation complex

spinqualitylabelsall models 7zah, resolution 2.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7zah is a 10 chain structure with sequence from Pyrococcus abyssi GE5. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 4AC, 4SU, 5MC, 5MU, 6MZ, A2M, B8H, GNP, H2U, LHH, MA6, MET, MG, OMC, OMG, OMU, PSU, UR3, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [RS3A_PYRAB] Publication Abstract from PubMed In eukaryotes and in archaea late steps of translation initiation involve the two initiation factors e/aIF5B and e/aIF1A. In eukaryotes, the role of eIF5B in ribosomal subunit joining is established and structural data showing eIF5B bound to the full ribosome were obtained. To achieve its function, eIF5B collaborates with eIF1A. However, structural data illustrating how these two factors interact on the small ribosomal subunit have long been awaited. The role of the archaeal counterparts, aIF5B and aIF1A, remains to be extensively addressed. Here, we study the late steps of Pyrococcus abyssi translation initiation. Using in vitro reconstituted initiation complexes and light scattering, we show that aIF5B bound to GTP accelerates subunit joining without the need for GTP hydrolysis. We report the crystallographic structures of aIF5B bound to GDP and GTP and analyze domain movements associated to these two nucleotide states. Finally, we present the cryo-EM structure of an initiation complex containing 30S bound to mRNA, Met-tRNAiMet, aIF5B and aIF1A at 2.7 A resolution. Structural data shows how archaeal 5B and 1A factors cooperate to induce a conformation of the initiator tRNA favorable to subunit joining. Archaeal and eukaryotic features of late steps of translation initiation are discussed. Role of aIF5B in archaeal translation initiation.,Kazan R, Bourgeois G, Lazennec-Schurdevin C, Larquet E, Mechulam Y, Coureux PD, Schmitt E Nucleic Acids Res. 2022 Jun 24;50(11):6532-6548. doi: 10.1093/nar/gkac490. PMID:35694843 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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