33 research outputs found
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Identification of gold nanoparticle-resistant mutants of Saccharomyces cerevisiae suggests a role for respiratory metabolism in mediating toxicity
Positively-charged gold nanoparticles (0.8-nm core diameter) reduced yeast
survival, but not growth, at a concentration of 10 to 100 μg/ml. Among 17 resistant
deletion mutants isolated in a genome-wide screen, highly significant enrichment
was observed for respiration-deficient mutants lacking genes encoding proteins
associated with the mitochondrion
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De novo synthesis of a sunscreen compound in vertebrates
Ultraviolet-protective compounds, such as mycosporine-like amino acids (MAAs) and related gadusols produced by some bacteria, fungi, algae, and marine invertebrates, are critical for the survival of reef-building corals and other marine organisms exposed to high-solar irradiance. These compounds have also been found in marine fish, where their accumulation is thought to be of dietary or symbiont origin. In this study, we report the unexpected discovery that fish can synthesize gadusol de novo and that the analogous pathways are also present in amphibians, reptiles, and birds. Furthermore, we demonstrate that engineered yeast containing the fish genes can produce and secrete gadusol. The discovery of the gadusol pathway in vertebrates provides a platform for understanding its role in these animals, and the possibility of engineering yeast to efficiently produce a natural sunscreen and antioxidant presents an avenue for its large-scale production for possible use in pharmaceuticals and cosmetics.This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by eLife Sciences Publications. The published article can be found at: http://elifesciences.org/Supporting information can be found at: http://elifesciences.org/content/4/e0591
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BakalinskyAlanFoodScienceTechnologyIdentificationGoldNanoparticle.pdf
Positively-charged gold nanoparticles (0.8-nm core diameter) reduced yeast
survival, but not growth, at a concentration of 10 to 100 μg/ml. Among 17 resistant
deletion mutants isolated in a genome-wide screen, highly significant enrichment
was observed for respiration-deficient mutants lacking genes encoding proteins
associated with the mitochondrion
Recommended from our members
SmithMarkFoodScienceTechnologyIdentificationGoldNanoparticle_SupplementalFile1.pdf
Positively-charged gold nanoparticles (0.8-nm core diameter) reduced yeast
survival, but not growth, at a concentration of 10 to 100 μg/ml. Among 17 resistant
deletion mutants isolated in a genome-wide screen, highly significant enrichment
was observed for respiration-deficient mutants lacking genes encoding proteins
associated with the mitochondrion
Recommended from our members
SmithMarkFoodScienceTechnologyIdentificationGoldNanoparticle.pdf
Positively-charged gold nanoparticles (0.8-nm core diameter) reduced yeast
survival, but not growth, at a concentration of 10 to 100 μg/ml. Among 17 resistant
deletion mutants isolated in a genome-wide screen, highly significant enrichment
was observed for respiration-deficient mutants lacking genes encoding proteins
associated with the mitochondrion
Recommended from our members
SmithMarkFoodScienceTechnologyIdentificationGoldNanoparticle_SupplementalFile2.pdf
Positively-charged gold nanoparticles (0.8-nm core diameter) reduced yeast
survival, but not growth, at a concentration of 10 to 100 μg/ml. Among 17 resistant
deletion mutants isolated in a genome-wide screen, highly significant enrichment
was observed for respiration-deficient mutants lacking genes encoding proteins
associated with the mitochondrion