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- W2896468237 abstract "The noncanonical amino acid azidohomoalanine (Aha) is known to be an environment-sensitive infrared probe for the site-specific investigation of protein structure and dynamics. Here, the capability of that label is explored to detect protein–ligand interactions by incorporating it in the vicinity of the binding groove of a PDZ2 domain. Circular dichroism and isothermal titration calorimetry measurements reveal that the perturbation of the protein system by mutation is negligible, with minimal influence on protein stability and binding affinity. Two-dimensional infrared spectra exhibit small (1–3 cm–1) but clearly measurable red shifts of the Aha vibrational frequency upon binding of two different peptide ligands, while accompanying molecular dynamics simulations suggest that these red shifts are induced by polar contacts with side chains of the peptide ligands. Hence, Aha is a versatile and minimally invasive vibrational label that is not only able to report on large structural changes during, e.g., protein folding, but also on very subtle changes of the electrostatic environment upon ligand binding." @default.
- W2896468237 created "2018-10-26" @default.
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- W2896468237 date "2018-10-21" @default.
- W2896468237 modified "2023-09-26" @default.
- W2896468237 title "Azidohomoalanine: A Minimally Invasive, Versatile, and Sensitive Infrared Label in Proteins To Study Ligand Binding" @default.
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- W2896468237 doi "https://doi.org/10.1021/acs.jpcb.8b08368" @default.
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