6q97
From Proteopedia
Structure of tmRNA SmpB bound in A site of E. coli 70S ribosome
Structural highlights
FunctionRL3_ECOLI One of two assembly inititator proteins, it binds directly near the 3'-end of the 23S rRNA, where it nucleates assembly of the 50S subunit.[HAMAP-Rule:MF_01325_B] Publication Abstract from PubMedDuring trans-translation, transfer-messenger RNA (tmRNA) and small protein B (SmpB) together rescue ribosomes stalled on a truncated mRNA and tag the nascent polypeptide for degradation. We used cryo-electron microscopy to determine the structures of three key states of the tmRNA-SmpB-ribosome complex during trans translation at resolutions of 3.7 to 4.4 angstroms. The results show how tmRNA and SmpB act specifically on stalled ribosomes and how the circularized complex moves through the ribosome, enabling translation to switch from the old defective message to the reading frame on tmRNA. How a circularized tmRNA moves through the ribosome.,Rae CD, Gordiyenko Y, Ramakrishnan V Science. 2019 Feb 15;363(6428):740-744. doi: 10.1126/science.aav9370. PMID:30765567[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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