A rapid method for detecting protein-nucleic acid interactions by protein induced fluorescence enhancement
| Authors | |
|---|---|
| Year of publication | 2016 |
| Type | Article in Periodical |
| Magazine / Source | Scientific Reports |
| MU Faculty or unit | |
| Citation | |
| web | http://www.nature.com/articles/srep39653 |
| Doi | http://dx.doi.org/10.1038/srep39653 |
| Field | Biochemistry |
| Keywords | SINGLE-MOLECULE; ENDONUCLEASE XPF-ERCC1; TRANSCRIPTION FACTORS; DNA INTERACTIONS; BINDING; REPAIR; POLYMERASE; INHIBITORS; ANISOTROPY; MECHANISM |
| Description | Many fundamental biological processes depend on intricate networks of interactions between proteins and nucleic acids and a quantitative description of these interactions is important for understanding cellular mechanisms governing DNA replication, transcription, or translation. Here we present a versatile method for rapid and quantitative assessment of protein/nucleic acid (NA) interactions. This method is based on protein induced fluorescence enhancement (PIFE), a phenomenon whereby protein binding increases the fluorescence of Cy3-like dyes. PIFE has mainly been used in single molecule studies to detect protein association with DNA or RNA. Here we applied PIFE for steady state quantification of protein/NA interactions by using microwell plate fluorescence readers (mwPIFE). We demonstrate the general applicability of mwPIFE for examining various aspects of protein/DNA interactions with examples from the restriction enzyme BamHI, and the DNA repair complexes Ku and XPF/ERCC1. These include determination of sequence and structure binding specificities, dissociation constants, detection of weak interactions, and the ability of a protein to translocate along DNA. mwPIFE represents an easy and high throughput method that does not require protein labeling and can be applied to a wide range of applications involving protein/NA interactions. |
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