9t7h

Cryo-EM structure of P. abyssi 70S ribosome in complex with hibernation factor HibA (L1 stalk conformation)

spinqualitylabelsall models 9t7h, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9t7h 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. Method: Electron Microscopy, Resolution 2.1Å Ligands: 4AC, 5MC, 6MZ, A2M, B8H, LHH, MA6, MG, OMC, OMG, OMU, UR3, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9UYR4_PYRAB Publication Abstract from PubMed Ribosome hibernation preserves translation machinery during stress, yet its mechanisms in Archaea remain poorly defined. Using cryo-EM analysis, we studied hibernation pathways in Pyrococcus abyssi stressed cells. We identified HibA, a previously unrecognized family of hibernation factors widespread in Archaea. HibA consists of a bacterial-like HPF/RaiA domain fused to a Cystathionine Beta Synthase module. Unexpectedly, HibA binds to the ribosome in three different conformations, occupying the A, P and E sites of tRNAs, as well as that of mRNA, enhancing its ability to protect the ribosome from degradation. Idle ribosomes also frequently accumulate the archaeal homolog of eukaryotic ribosome maturation protein SBDS (aSBDS), suggesting that stressed archaeal cells may engage parallel hibernation routes in which aSBDS can complement HibA. Deletion of hibA in Thermococcus barophilus delays recovery from stationary phase and reduces 70S ribosome pools, establishing its role in ribosome preservation. Taxonomic profiling shows that many archaeal lineages encode distinct repertoires of ribosome-associated protection factors, underscoring the modular and multi-layered nature of archaeal hibernation systems. In addition, a comprehensive phylogenetic analysis highlights the evolutionary relationships between prevalent ribosome hibernation factors across Bacteria and Archaea. A family of ribosome hibernation factors widespread in Archaea.,Madru C, Bourgeois G, Dulermo R, Capeyrou R, Joncour G, Figuigui K, Duchateau M, Chamot-Rooke J, Duboc C, l'Haridon S, Mc Teer L, Kwapisz M, Clouet-d'Orval B, Bouvier M, Mechulam Y, Borrel G, Schmitt E, Flament D Nat Commun. 2026 Apr 27. doi: 10.1038/s41467-026-72341-8. PMID:42045235 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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