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Poly(dehydroalanine): Synthesis, Properties, and Functional Diversification of a Fluorescent Polypeptide
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https://doi.org/10.1021/jacs.2c00383Abstract
Via the design of a new, soluble poly(S-alkyl-l-cysteine) precursor, a route was developed for the successful preparation of long-chain poly(dehydroalanine), ADH, as well as the incorporation of dehydroalanine residues and ADH segments into copolypeptides. Based on experimental and computational data, ADH was found to adopt a previously unobserved "hybrid coil" structure, which combines the elements of 25-helical and 310-helical conformations. Analysis of the spectroscopic properties of ADH revealed that it possesses a strong inherent blue fluorescence, which may be amenable for use in imaging applications. ADH also contains reactive electrophilic groups that allowed its efficient modification to functionalized polypeptides after reactions under mild conditions with thiol and amine nucleophiles. The combined structural, spectroscopic, and reactivity properties of ADH make it a unique reactive and fluorescent polypeptide component for utilization in self-assembled biomaterials.
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