9frl

Cryo-EM structure of Saccharolobus solfataricus 30S initiation complex bound to SD mRNA with h44 in up position

spinqualitylabelsall models 9frl, resolution 2.97Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9frl is a 10 chain structure with sequence from Saccharolobus solfataricus P2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.97Å Ligands: 4AC, 4SU, 5MC, 5MU, 6MZ, A2M, C4J, H2U, MA6, MG, OMC, OMG, OMU, PSU, SPM, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RS3A_SACS2 Publication Abstract from PubMed The archaeal ribosome is of the eukaryotic type. TACK and Asgard superphyla, the closest relatives of eukaryotes, have ribosomes containing eukaryotic ribosomal proteins not found in other archaea, eS25, eS26 and eS30. Here, we investigate the case of Saccharolobus solfataricus, a TACK crenarchaeon, using mainly leaderless mRNAs. We characterize the small ribosomal subunit of S. solfataricus bound to SD-leadered or leaderless mRNAs. Cryo-EM structures show eS25, eS26 and eS30 bound to the small subunit. We identify two ribosomal proteins, aS33 and aS34, and an additional domain of eS6. Leaderless mRNAs are bound to the small subunit with contribution of their 5'-triphosphate group. Archaeal eS26 binds to the mRNA exit channel wrapped around the 3' end of rRNA, as in eukaryotes. Its position is not compatible with an SD:antiSD duplex. Our results suggest a positive role of eS26 in leaderless mRNAs translation and possible evolutionary routes from archaeal to eukaryotic translation. Structures of Saccharolobus solfataricus initiation complexes with leaderless mRNAs highlight archaeal features and eukaryotic proximity.,Bourgeois G, Coureux PD, Lazennec-Schurdevin C, Madru C, Gaillard T, Duchateau M, Chamot-Rooke J, Bourcier S, Mechulam Y, Schmitt E Nat Commun. 2025 Jan 2;16(1):348. doi: 10.1038/s41467-024-55718-5. PMID:39753558 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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