| Autor: |
Robby, Fritzsch, Paul M, Donaldson, Gregory M, Greetham, Michael, Towrie, Anthony W, Parker, Matthew J, Baker, Neil T, Hunt |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
Analytical chemistry. 90(4) |
| ISSN: |
1520-6882 |
| Popis: |
Two-dimensional infrared spectroscopy (2D-IR) is well established as a specialized, high-end technique for measuring structural and solvation dynamics of biological molecules. Recent technological developments now make it possible to acquire time-resolved 2D-IR spectra within seconds, and this opens up the possibility of screening-type applications comparing spectra spanning multiple samples. However, such applications bring new challenges associated with finding accurate, efficient methodologies to analyze large data sets in a timely, informative manner. Here, we demonstrate such an application by screening 2016 2D-IR spectra of 12 double-stranded DNA oligonucleotides obtained in the presence and absence of binding therapeutic molecule Hoechst 33258. By applying analysis of variance combined with principal component analysis (ANOVA-PCA) to 2D-IR data for the first time, we demonstrate the ability to efficiently retrieve the base composition of a DNA sequence and discriminate ligand-DNA complexes from unbound sequences. We further show accurate differentiation of the induced-fit and rigid-body binding modes that is key to identifying optimal binding interactions of Hoechst 33258, while ANOVA-PCA results across the full sequence range correlate directly with thermodynamic indicators of ligand-binding strength that require significantly longer data acquisition times to obtain. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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