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Cryo-EM structure of a pre-60S ribosomal subunit - state C
Structural highlights
FunctionZN622_HUMAN Pre-60S-associated cytoplasmic factor involved in the cytoplasmic maturation of the 60S subunit.[1] Publication Abstract from PubMedRibosome biogenesis is an elaborate and energetically expensive program that involve two hundred protein factors in eukaryotes. Nuclear export of pre-ribosomal particles is one central step which also serves as an internal structural checkpoint to ensure the proper completion of nuclear assembly events. Here we present four structures of human pre-60S particles isolated through a nuclear export factor NMD3, representing assembly stages immediately before and after nuclear export. These structures reveal locations of a dozen of human factors, including an uncharacterized factor TMA16 localized between the 5S RNA and the P0 stalk. Comparison of these structures shows a progressive maturation for the functional regions, such as peptidyl transferase centre and peptide exit tunnel, and illustrate a sequence of factor-assisted rRNA maturation events. These data facilitate our understanding of the global conservation of ribosome assembly in eukaryotes and species-specific features of human assembly factors. Structural snapshots of human pre-60S ribosomal particles before and after nuclear export.,Liang X, Zuo MQ, Zhang Y, Li N, Ma C, Dong MQ, Gao N Nat Commun. 2020 Jul 15;11(1):3542. doi: 10.1038/s41467-020-17237-x. PMID:32669547[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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