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• W3185386825 abstract "Intracellular proteins function in a complex milieu wherein small molecules influence protein folding and act as essential cofactors for enzymatic reactions. Thus protein function depends not only on amino acid sequence but also on the concentrations of such molecules, which are subject to wide variation between organisms, metabolic states, and environmental conditions. We previously found evidence that exogenous guanidine reverses the phenotypes of specific budding yeast septin mutants by binding to a WT septin at the former site of an Arg side chain that was lost during fungal evolution. Here, we used a combination of targeted and unbiased approaches to look for other cases of chemical rescue by naturally occurring small molecules. We report in vivo rescue of hundreds of Saccharomyces cerevisiae mutants representing a variety of genes, including likely examples of Arg or Lys side chain replacement by the guanidinium ion. Failed rescue of targeted mutants highlight features required for rescue, as well as key differences between the in vitro and in vivo environments. Some non-Arg mutants rescued by guanidine likely result from off-target effects on specific cellular processes in WT cells. Molecules isosteric to guanidine and known to influence protein folding had a range of effects, from essentially none for urea, to rescue of a few mutants by DMSO. Strikingly, the osmolyte trimethylamine-N-oxide rescued ∼20% of the mutants we tested, likely reflecting combinations of direct and indirect effects on mutant protein function. Our findings illustrate the potential of natural small molecules as therapeutic interventions and drivers of evolution." @default.
• W3185386825 created "2021-08-02" @default.
• W3185386825 creator A5018034028 @default.
• W3185386825 creator A5053451972 @default.
• W3185386825 creator A5059374123 @default.
• W3185386825 creator A5078040703 @default.
• W3185386825 creator A5082887631 @default.
• W3185386825 date "2021-07-17" @default.
• W3185386825 modified "2023-09-27" @default.
• W3185386825 title "Chemical rescue of mutant proteins in living Saccharomyces cerevisiae cells by naturally occurring small molecules" @default.
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