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• W2122361837 endingPage "4597" @default.
• W2122361837 startingPage "4587" @default.
• W2122361837 abstract "The antizyme protein, Oaz1, regulates synthesis of the polyamines putrescine, spermidine and spermine by controlling stability of the polyamine biosynthetic enzyme, ornithine decarboxylase. Antizyme mRNA translation depends upon a polyamine-stimulated +1 ribosomal frameshift, forming a complex negative feedback system in which the translational frameshifting event may be viewed in engineering terms as a feedback controller for intracellular polyamine concentrations. In this article, we present the first systems level study of the characteristics of this feedback controller, using an integrated experimental and modeling approach. Quantitative analysis of mutant yeast strains in which polyamine synthesis and interconversion were blocked revealed marked variations in frameshift responses to the different polyamines. Putrescine and spermine, but not spermidine, showed evidence of co-operative stimulation of frameshifting and the existence of multiple ribosome binding sites. Combinatorial polyamine treatments showed polyamines compete for binding to common ribosome sites. Using concepts from enzyme kinetics and control engineering, a mathematical model of the translational controller was developed to describe these complex ribosomal responses to combinatorial polyamine effects. Each one of a range of model predictions was successfully validated against experimental frameshift frequencies measured in S-adenosylmethionine-decarboxylase and antizyme mutants, as well as in the wild-type genetic background." @default.
• W2122361837 created "2016-06-24" @default.
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• W2122361837 date "2011-02-07" @default.
• W2122361837 modified "2023-10-12" @default.
• W2122361837 title "Translational recoding as a feedback controller: systems approaches reveal polyamine-specific effects on the antizyme ribosomal frameshift" @default.
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• W2122361837 doi "https://doi.org/10.1093/nar/gkq1349" @default.
• W2122361837 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3113565" @default.
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• W2122361837 hasPublicationYear "2011" @default.
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