Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Partially Folded States of Mutant Ubiquitin in Mild Denaturing Conditions

  • Park, Soon-Ho (Department of Biochemistry and Molecular Biology, Research Institute of Oral Sciences, College of Dentistry,Kangnung-Wonju National University)
  • Published : 2009.07.20
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Abstract

Conformational change of ubiquitin variant with valine to alanine mutation at sequence position 26 was studied by varying solvent pH. Fluorescence emission spectra indicated that this variant ubiquitin has some residual structures in acidic and basic solution as compared to denaturant-induced unfolded state. Far-UV circular dichroic spectra indicated that the base-denatured state had more secondary structure than the acid-denatured state. Near-UV circular dichroic spectra indicated that the aromatic side-chains were in the relatively more rigid environment in the base-denatured state than those in the acid-denatured state. Although it appears that the more tertiary structure present in the base-denatured state, refolding reactions measured by stopped-flow fluorescence device suggest that both the acid- and base-denatured states occur before the major folding transition state. The acid- and base-denatured states are considered to reflect the early event of protein folding process.

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