<i>In Vitro</i> Site-Specific Incorporation of Fluorescent Probes into β-Galactosidase
作者:Lance E. Steward、Cynthia S. Collins、Marcella A. Gilmore、Justin E. Carlson、J. B. Alexander Ross、A. Richard Chamberlin
DOI:10.1021/ja963023f
日期:1997.1.1
Fluorescence spectroscopy is a powerful biophysical technique for studying protein structure, function, dynamics, and intermolecular interactions. Such studies are often conducted using intrinsic probes, such as tryptophan residues, or extrinsic probes introduced by post-translational modification, such as dansyl. Specificity, however, is often a concern since many proteins contain more than one tryptophan and chemical modification often will occur at more than one site. Herein we report the in vitro, site-specific incorporation of three fluorescent amino acid analogues, 5-hydroxytryptophan, 7-azatryptophan, and epsilon-dansyllysine, each of which was incorporated into beta-galactosidase at a single designated site.