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Eukaryotic peptide chain release factor 1 participates in translation termination of specific cysteine-poor prolamines in rice endosperm. | LitMetric

AI Article Synopsis

Article Abstract

Prolamines are alcohol-soluble proteins classified as either cysteine-poor (CysP) or cysteine-rich (CysR) based on whether they can be alcohol-extracted without or with reducing agents, respectively. In rice esp1 mutants, various CysP prolamines exhibit both reduced and normal amounts of isoelectric focusing bands, indicating that the mutation affects only certain prolamine classes. To examine the genetic regulation of CysP prolamine synthesis and accumulation, we constructed a high-resolution genetic linkage map of ESP1. The ESP1 gene was mapped to within a 20 kb region on rice chromosome 7. Sequencing analysis of annotated genes in this region revealed a single-nucleotide polymorphism within eukaryotic peptide chain release factor (eRF1), which participates in stop-codon recognition and nascent-polypeptide release from ribosomes during translation. A subsequent complementation test revealed that ESP1 encodes eRF1. We also identified UAA as the stop codon of CysP prolamines with reduced concentration in esp1 mutants. Recognition assays and microarray analysis confirmed that ESP1/eRF1 recognizes UAA/UAG, but not UGA. Our results provide convincing evidence that ESP1/eRF1 participates in the translation termination of CysP prolamines during seed development.

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http://dx.doi.org/10.1016/j.plantsci.2018.12.006DOI Listing

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