alexa Effect of hydrostatic pressure on unfolding of alpha-lactalbumin: volumetric equivalence of the molten globule and unfolded state.
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Journal of Proteomics & Bioinformatics

Author(s): Kobashigawa Y, Sakurai M, Nitta K

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Abstract The effect of pressure on the unfolding of bovine alpha-lactalbumin was investigated by ultraviolet absorption methods. The change of molar volume associated with unfolding, deltaV, was measured in the presence or absence of guanidine hydrochloride at pH 7. The deltaV was estimated to be -63 cm3/mol in the absence of a chemical denaturant. While in the presence of guanidine hydrochloride (GuHCl), it was found that deltaV was -66 cm3/mol at 25 degrees C and was independent of the concentration of GuHCl, despite the fact that the molten globule fraction in the total unfolding product decreased with the increase of GuHCl concentration. The results indicate that the volume of alpha-lactalbumin only changes at the transition from a native to a molten globule state, and almost no volume change has been found during the transition from a molten globule to the unfolded state.
This article was published in Protein Sci and referenced in Journal of Proteomics & Bioinformatics

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