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Compactness of the molten globule in comparison to unfolded states as observed by size-exclusion chromatography

Authors
Journal
Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology
0167-4838
Publisher
Elsevier
Publication Date
Volume
1209
Issue
1
Identifiers
DOI: 10.1016/0167-4838(94)90149-x
Keywords
  • Size-Exclusion Chromatography
  • Urea And Alkylurea Denaturation
  • Unfolded State
  • Molten Globule Intermediate
  • Stefin
  • A And B
Disciplines
  • Biology

Abstract

Abstract The volumes of elution of denatured states of four proteins at high urea (8 M) and ethylurea (6 M) concentration were determined. They were found equally unfolded in both solvents. The volumes of elution of the unfolded states were compared to those of the native states and of some molten globule intermediates. It has been shown that the protein proteinase inhibitor stefin B, exhibits ‘molten globule’-like properties on acid denaturation. The high salt acidic intermediate (a molten globule) as well as the native state of stefin B eluted as dimers, at 18°C. On thermal denaturation above 42°C, the intermediate dissociated into compact monomers. The more stable stefin A, which is monomeric and does not transform into molten globule intermediates under similar perturbing conditions, was always used for comparison. The states of both, stefin A and B in 50% methanol were found to be monomeric and of native-like compactness.

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