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Denaturation Study of Bovine Serum Albumin Induced by Guanidine Chloride with Fluorescence Spectroscopy |
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DOI:10.3969/j.issn.1004-4957.年份.月份 |
KeyWord:fluorescence spectroscopy bovine serum albumin guanidine chloride denaturatio |
Author | Institution |
李向荣,闫云辉 |
新乡医学院基础医学院化学教研室 |
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Abstract: |
The interaction between guanidine chloride and bovine serum albumin(BSA) in aqueous solution as well as the denaturation process of BSA were studied with fluorescence spectroscopy at 30 ℃ and two pHs.The fluorescence spectroscopic data were analyzed with the methods described by Pace.The unfolding fraction(fu),denaturation equilibrium constant(Ku) and free energy of unfolding(ΔGu)of protein were calculated.The transition midpoint(c1/2) ,steepness of the transition region(m) and free energy of unfolding(ΔGH2O) were also obtained.The results indicated that the denaturation of BSA was induced by guanidine chloride through direct and indirect effects,the interaction between guanidine chloride and BSA was divided into three stages.When the guanidine chloride concentrations reached 60 mol?L-1,the unfolded fraction fu was about 1 and the BSA was completely denaturated. |
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