Abstract
The success rate of nucleic acids/ligands co-crystallization can be significantly improved by performing preliminary biophysical analyses. Among suitable biophysical approaches, isothermal titration calorimetry (ITC) is certainly a method of choice. ITC can be used in a wide range of experimental conditions to monitor in real time the formation of the RNA– or DNA–ligand complex, with the advantage of providing in addition the complete binding profile of the interaction. Following the ITC experiment, the complex is ready to be concentrated for crystallization trials. This chapter describes a detailed experimental protocol for using ITC as a tool for monitoring RNA/small molecule binding, followed by co-crystallization.
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Acknowledgments
This work was supported by grants from the Agence Nationale pour la Recherche (grant ANR-12-BS07-0007-03 “ClickEnARN”) and the Agence Nationale de Recherches sur le SIDA (ANRS). The authors would like to thank Vincent Olieric (Paul Scherrer Institute/Swiss Light Source, Villigen, Switzerland), Natalia Markova and Peter Gimeson (Microcal-Malvern, Uppsala, Sweden).
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Da Veiga, C., Mezher, J., Dumas, P., Ennifar, E. (2016). Isothermal Titration Calorimetry: Assisted Crystallization of RNA–Ligand Complexes. In: Ennifar, E. (eds) Nucleic Acid Crystallography. Methods in Molecular Biology, vol 1320. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-2763-0_9
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DOI: https://doi.org/10.1007/978-1-4939-2763-0_9
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