Genetic Encoding of Fluoro-l-tryptophans for Site-Specific Detection of Conformational Heterogeneity in Proteins by NMR Spectroscopy
Haocheng Qianzhu,
Elwy H. Abdelkader,
Gottfried Otting
et al.
Abstract:The substitution of a single hydrogen atom in a protein by fluorine yields a site-specific probe for sensitive detection by 19 F nuclear magnetic resonance (NMR) spectroscopy, where the absence of background signal from the protein facilitates the detection of minor conformational species. We developed genetic encoding systems for the site-selective incorporation of 4fluorotryptophan, 5-fluorotryptophan, 6-fluorotryptophan, and 7fluorotryptophan in response to an amber stop codon and used them to investigate … Show more
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