Summary
The several advantages that capillary electrophoresis (CE) offers in the study of protein folding, protein–ligand and protein–protein interactions, render this methodology appealing in several areas. In this chapter, a specific example is reported, where the use of affinity CE (ACE) in drug discovery is particularly advantageous over other separative and spectroscopic techniques. ACE is an analytical approach in which the migration patterns of interacting molecules in an electric field are recorded and used to identify specific binding and to estimate binding constants. A library of compounds has been tested, in free solution and with minimum sample consumption, for the affinity to two targets previously separated by CE, the native form and the partially structured intermediate of the folding of β2-microglobulin (β2-m) [Chiti et al. (J. Biol. Chem. 276:46714–46721, 2001), Quaglia et al. (Electrophoresis 26:4055–4063, 2005)]. β2-m is an intrinsically amyloidogenic protein, and its tendency to misfold is responsible for dialysis-related amyloidosis, an unavoidable complication of chronic haemodialysed patients. The criteria for choosing the compounds to be screened, the method conditions, and the possible data analysis strategies are detailed and discussed in this chapter.
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Acknowledgments
The authors would like to thank Professor Vittorio Bellotti for providing recombinant beta2-microglobulin and for continuous support and inspiration. Dr. Chiara Carazzone and Dr. Raffaella Colombo are gratefully acknowledged for their invaluable expertise in the experimental part. This work was financed by MIUR (FIRB RBNEO1529H and PRIN 2005051707).
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Quaglia, M., De Lorenzi, E. (2010). Capillary Electrophoresis in Drug Discovery. In: Roque, A. (eds) Ligand-Macromolecular Interactions in Drug Discovery. Methods in Molecular Biology, vol 572. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60761-244-5_12
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DOI: https://doi.org/10.1007/978-1-60761-244-5_12
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