Chemical shift perturbation (CSP) is a simple NMR technique for studying the DNA binding of proteins. Titration of the unlabeled DNA into the 15N-labeled protein is monitored by acquiring a two-dimensional (2D) heteronuclear single-quantum correlation (HSQC) spectrum at each step of the titration. CSP can also provide information on the DNA-binding dynamics of proteins, as well as protein-induced conformational changes in DNA. Here, we describe the titration of DNA for the 15N-labeled Z-DNA-binding protein, monitored via 2D HSQC spectra. NMR titration data can be analyzed with the active B-Z transition model to provide the protein-induced B-Z transition dynamics of DNA.
Keywords: Chemical shift perturbation; DNA–protein interaction; Dynamics; NMR; Titration; Z-DNA; Z-DNA-binding protein.
© 2023. The Author(s), under exclusive license to Springer Science+Business Media, LLC, part of Springer Nature.