Dissecting protein-induced DNA looping dynamics in real time

N Laurens, SRW Bellamy, AF Harms, YS Kovacheva, SE Halford, GJL Wuite

Research output: Contribution to journalArticle (Academic Journal)peer-review

30 Citations (Scopus)


Many proteins that interact with DNA perform or enhance their specific functions by binding simultaneously to multiple target sites, thereby inducing a loop in the DNA. The dynamics and energies involved in this loop formation influence the reaction mechanism. Tethered particle motion has proven a powerful technique to study in real time protein-induced DNA looping dynamics while minimally perturbing the DNA–protein interactions. In addition, it permits many single-molecule experiments to be performed in parallel. Using as a model system the tetrameric Type II restriction enzyme SfiI, that binds two copies of its recognition site, we show here that we can determine the DNA–protein association and dissociation steps as well as the actual process of protein-induced loop capture and release on a single DNA molecule. The result of these experiments is a quantitative reaction scheme for DNA looping by SfiI that is rigorously compared to detailed biochemical studies of SfiI looping dynamics. We also present novel methods for data analysis and compare and discuss these with existing methods. The general applicability of the introduced techniques will further enhance tethered particle motion as a tool to follow DNA–protein dynamics in real time.
Translated title of the contributionDissecting protein-induced DNA looping dynamics in real time
Original languageEnglish
Pages (from-to)5454 - 5464
Number of pages11
JournalNucleic Acids Research
Volume37 (16)
Publication statusPublished - Sep 2009

Bibliographical note

Other: First published on-line 8th July 2009

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