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Title: Position-dependent termination and widespread obligatory frameshifting in Euplotes translation

Journal Article · · Nature Structural & Molecular Biology
DOI:https://doi.org/10.1038/nsmb.3330· OSTI ID:1372981

The ribosome can change its reading frame during translation in a process known as programmed ribosomal frameshifting. These rare events are supported by complex mRNA signals. However, we found that the ciliates Euplotes crassus and Euplotes focardii exhibit widespread frameshifting at stop codons. 47 different codons preceding stop signals resulted in either +1 or +2 frameshifts, and +1 frameshifting at AAA was the most frequent. The frameshifts showed unusual plasticity and rapid evolution, and had little influence on translation rates. The proximity of a stop codon to the 3' mRNA end, rather than its occurrence or sequence context, appeared to designate termination. Thus, a ‘stop codon’ is not a sufficient signal for translation termination, and the default function of stop codons in Euplotes is frameshifting, whereas termination is specific to certain mRNA positions and probably requires additional factors.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1372981
Report Number(s):
PNNL-SA-123907; 453040220
Journal Information:
Nature Structural & Molecular Biology, Vol. 24, Issue 1; ISSN 1545-9993
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English

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