Abstract
Application of typical HDX methods to examine intrinsically disordered proteins (IDP), proteins that are natively unstructured and highly dynamic at physiological pH, is limited because of the rapid exchange of unprotected amide hydrogens with solvent. The exchange rates of these fast exchanging amides are usually faster than the shortest time scale (10 s) employed in typical automated HDX-MS experiments. Considering the functional importance of IDPs and their association with many diseases, it is valuable to develop methods that allow the study of solution dynamics of these proteins as well as the ability to probe the interaction of IDPs with their wide range of binding partners. Here, we report the application of time window expansion to the millisecond range by altering the on-exchange pH of the HDX experiment to study a well-characterized IDP; the activation domain of the nuclear receptor coactivator, peroxisome proliferator-activated receptor gamma coactivator-1 alpha (PGC-1α). This method enabled mapping the regions of PGC-1α that are stabilized upon binding the ligand binding domain (LBD) of the nuclear receptor peroxisome proliferator-activated receptor gamma (PPARγ). We further demonstrate the method’s applicability to other binding partners of the IDP PGC-1α and pave the way for characterizing many other biologically important ID proteins.
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Acknowledgments
The authors are grateful for support from Ruben Garcia-Ordonez for the protein preparation. The work was supported in part by a Pfizer postdoctoral fellowship and NIGMS (GM084041, to P.R.G.).
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Supplementary Figure 1
Deuterium buildup curves for selected regions of PGC-1α 220. The differential HDX experiment was carried out with PGC-1α 220 in the presence and absence of PPARγ LBD-Rosiglitazone at pH 6.0 (PPTX 97 kb)
Supplementary Figure 3
Measurement of thermodynamic stability (Tm) and hence the affinity between PGC-1α 220 and PPARγ. (A) and (B) Representative thermal denaturation curves using Far-UV CD spectra at pH 7.5 and pH 6.0. (C) Tabulated triplicate Tm values, average values and the standard deviation of the binary complex at pH 7.5 and pH 6.0. The differences are not statistically significant. Thermodynamic measurement using CD is performed according to [35] except the wavelength used is 230 nm (PPTX 3287 kb)
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Goswami, D., Devarakonda, S., Chalmers, M.J. et al. Time Window Expansion for HDX Analysis of an Intrinsically Disordered Protein. J. Am. Soc. Mass Spectrom. 24, 1584–1592 (2013). https://doi.org/10.1007/s13361-013-0669-y
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DOI: https://doi.org/10.1007/s13361-013-0669-y