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Novel non-natural amino acids carrying a dansyl fluorescent group were designed, synthesized, and incorporated into various positions of streptavidin by using a CGGG four-base codon in an Escherichia coli in vitro translation system. 2,6-Dansyl-aminophenylalanine (2,6-dnsAF) was found to be incorporated into the protein more efficiently than 1,5-dansyl-lysine, 2,6-dansyl-lysine, and 1,5-dansyl-aminophenylalanine...
A small and highly fluorescent non-natural amino acid that contains an anthraniloyl group (atnDap) was incorporated into various positions of streptavidin. The positions were directed by a CGGG/CCCG four-base codon/anticodon pair. The non-natural mutants were obtained in excellent yields and some of them retained strong biotin-binding activity. The fluorescence wavelength as well as the intensity...
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