Fluoro amino acids: a rarity in nature, yet a prospect for protein engineering

Biotechnology Journal
Corinna OdarBirgit Wiltschi

Abstract

Fluoro amino acids are highly valuable compounds constantly gaining relevance in diverse fields of the biosciences as well as in the pharmaceutical industry. The value of these compounds can be attributed to the properties of the extremely electronegative fluorine atom. This atom forms a highly polarized bond of extraordinary strength with carbon. The formation of the fluorine-carbon bond is challenging: its chemical synthesis demands harsh reaction conditions and to date only one class of enzyme has been found capable of introducing the fluoride ion into an organic compound. Most of these fluorinating enzymes participate in the biosynthesis of 4-fluoro-L-threonine, the only fluoro amino acid of natural origin discovered so far. Despite their scarcity in nature, fluoro amino acids are valuable tools to fluorinate proteins. The fluoro protein variants often show improved stability and folding as well as altered activity and fluorescence characteristics. This review details the biosynthesis of 4-fluoro-L-threonine with a special focus on the fluorinating enzymes. Moreover, we elaborate on the application of fluoro amino acids as building blocks for fluorinated protein variants. Insight into different techniques to incorporate flu...Continue Reading

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Feb 13, 2016·Fungal Genetics and Biology : FG & B·Birgit Wiltschi
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