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Effect of Ficoll 70 on thermal stability and structure of creatine kinase

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Abstract

The effect of Ficoll 70 on the thermal stability and structure of creatine kinase (CK) was studied using far-UV CD spectra and intrinsic fluorescence spectra. The thermal transition curves monitored by CD spectra were fitted to a two-state model using a modified form of the van’t Hoff equation to obtain the transition temperature (T m) and enthalpy change (ΔH u) of thermally induced denaturation of CK in the absence and presence of Ficoll 70. An increase in T m with constant ΔH u was observed with increasing Ficoll 70 concentration, suggesting that Ficoll 70 enhances the thermal stability of CK. Fluorescence spectral measurements confirmed this protective effect of Ficoll 70 on CK structure. In addition, we observed a crowding-induced compaction effect on the structure of both native state and thermally denatured state of CK in the presence of Ficoll 70, which is more obvious on the structure of the denatured ensemble compared to that of the native ensemble. Our observations qualitatively accord with the predictions of previously proposed crowding theory for the effect of intermolecular excluded volume on protein stability and structure. These findings imply that the effects of macromolecular crowding are essential to our understanding of protein folding and unfolding occurring in vivo.

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Abbreviations

CK:

creatine kinase

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Correspondence to Sen Li.

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Wang, Y., He, H. & Li, S. Effect of Ficoll 70 on thermal stability and structure of creatine kinase. Biochemistry Moscow 75, 648–654 (2010). https://doi.org/10.1134/S0006297910050160

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  • DOI: https://doi.org/10.1134/S0006297910050160

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