| Literature DB >> 30765567 |
Christopher D Rae1, Yuliya Gordiyenko1, V Ramakrishnan2.
Abstract
During 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.Entities:
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Year: 2019 PMID: 30765567 PMCID: PMC6440651 DOI: 10.1126/science.aav9370
Source DB: PubMed Journal: Science ISSN: 0036-8075 Impact factor: 47.728