منابع مشابه
Stop codons preceded by rare arginine codons are efficient determinants of SsrA tagging in Escherichia coli.
The SsrA or tmRNA quality control system intervenes when ribosomes stall on mRNAs and directs the addition of a C-terminal peptide tag that targets the modified polypeptide for degradation. Although hundreds of SsrA-tagged proteins can be detected in cells when degradation is prevented, most of these species have not been identified. Consequently, the mRNA sequence determinants that cause ribos...
متن کاملQuantitative analysis of in vivo ribosomal events at UGA and UAG stop codons.
An in vivo translation assay system has been designed to measure, in one and the same assay, the three alternatives for a ribosome poised at a stop codon (termination, read-through and frameshift). A quantitative analysis of the competition has been done in the presence and absence of release factor (RF) mutants, nonsense suppressors and an upstream Shine-Dalgarno-like sequence. The ribosomal +...
متن کاملLeaky termination at premature stop codons antagonizes nonsense-mediated mRNA decay in <i>S. cerevisiae</i>
The Nonsense-Mediated mRNA Decay (NMD) pathway mediates the rapid degradation of mRNAs that contain premature stop mutations in eukaryotic organisms. It was recently shown that mutations in three yeast genes that encode proteins involved in the NMD process, UPF1, UPF2, and UPF3, also reduce the efficiency of translation termination. In the current study, we compared the efficiency of translatio...
متن کاملNew insights into the incorporation of natural suppressor tRNAs at stop codons in Saccharomyces cerevisiae
Stop codon readthrough may be promoted by the nucleotide environment or drugs. In such cases, ribosomes incorporate a natural suppressor tRNA at the stop codon, leading to the continuation of translation in the same reading frame until the next stop codon and resulting in the expression of a protein with a new potential function. However, the identity of the natural suppressor tRNAs involved in...
متن کاملATP hydrolysis by UPF1 is required for efficient translation termination at premature stop codons
Nonsense-mediated mRNA decay (NMD) represents a eukaryotic quality control pathway that recognizes and rapidly degrades transcripts harbouring nonsense mutations to limit accumulation of non-functional and potentially toxic truncated polypeptides. A critical component of the NMD machinery is UPF1, an RNA helicase whose ATPase activity is essential for NMD, but for which the precise function and...
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ژورنال
عنوان ژورنال: Chemistry & Biology
سال: 2003
ISSN: 1074-5521
DOI: 10.1016/s1074-5521(03)00130-3