The translation machinery of cells can be exploited for the incorporation of various non canonical amino acids into proteins. In this work, different fluoro-, amino-, and methyl- containing Tryptophan and Leucine analogues were incorporated into model proteins by the use of selective pressure incorporation (SPI) method. Such isosteric replacements introduced minimal local geometry changes in indole moieties, often at the level of single atomic exchange (atomic mutation) and normally do not affect 3D structures of substituted proteins, but induce significant changes in spectral and folding properties. For example, mutants of Barstar can be stabilised by incorporation of fluorinated Tryptophan analogues, while Tryptophan-fluorescence can be abolished by 4- and 7-Fluorotryptophan. Proteins substituted by toxic analogues can be specifically intracellulary delivered and after their recycling and the release of an analogue target, cells would be directed to apoptosis or necrosis.
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The translation machinery of cells can be exploited for the incorporation of various non canonical amino acids into proteins. In this work, different fluoro-, amino-, and methyl- containing Tryptophan and Leucine analogues were incorporated into model proteins by the use of selective pressure incorporation (SPI) method. Such isosteric replacements introduced minimal local geometry changes in indole moieties, often at the level of single atomic exchange (atomic mutation) and normally do not affec...
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