7pnt | pdb_00007pnt

Assembly intermediate of mouse mitochondrial ribosome small subunit without mS37 in complex with RbfA and Tfb1m

spinqualitylabelsall models 7pnt, resolution 3.19Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7pnt is a 10 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.19Å Ligands: 5F0, ATP, AYA, FES, K, MG, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RT02_MOUSE Required for mitoribosome formation and stability, and mitochondrial translation.[UniProtKB:Q9Y399] Publication Abstract from PubMed Mitoribosomes are essential for the synthesis and maintenance of bioenergetic proteins. Here we use cryo-electron microscopy to determine a series of the small mitoribosomal subunit (SSU) intermediates in complex with auxiliary factors, revealing a sequential assembly mechanism. The methyltransferase TFB1M binds to partially unfolded rRNA h45 that is promoted by RBFA, while the mRNA channel is blocked. This enables binding of METTL15 that promotes further rRNA maturation and a large conformational change of RBFA. The new conformation allows initiation factor mtIF3 to already occupy the subunit interface during the assembly. Finally, the mitochondria-specific ribosomal protein mS37 (ref. (1)) outcompetes RBFA to complete the assembly with the SSU-mS37-mtIF3 complex(2) that proceeds towards mtIF2 binding and translation initiation. Our results explain how the action of step-specific factors modulate the dynamic assembly of the SSU, and adaptation of a unique protein, mS37, links the assembly to initiation to establish the catalytic human mitoribosome. Mechanism of mitoribosomal small subunit biogenesis and preinitiation.,Itoh Y, Khawaja A, Laptev I, Cipullo M, Atanassov I, Sergiev P, Rorbach J, Amunts A Nature. 2022 Jun;606(7914):603-608. doi: 10.1038/s41586-022-04795-x. Epub 2022 , Jun 8. PMID:35676484 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribosome 3D structures

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