Protein-S-S-Glutathione Mixed Disulfides as Models of Unfolded Protein

Ruoppolo, Margherita and Freedman, Robert B. (1994) Protein-S-S-Glutathione Mixed Disulfides as Models of Unfolded Protein. Biochemistry, 33 (24). pp. 7654-7662. ISSN 0006-2960. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Mixed disulfides between glutathione and the reduced forms of disulfide-bonded proteins were generated and characterized to explore their suitability as models of the unfolded state of newly-synthesized secretory proteins. RNase T-1 and alpha-lactalbumin were reduced and converted to mixed disulfide derivatives, named GS-RNase T-1 and GS-alpha-lactalbumin, in good yield; the molecular masses of the derivatives were confirmed by electrospray mass spectrometry. The intrinsic fluorescence of the derivatives and the binding of the hydrophobic fluorescent dye ANS were characteristic of fully unfolded proteins. Fluorescence studies and enzyme activity data indicated that GS-RNase T-1 could be refolded to a nativelike state at NaCl concentrations greater than 1.5 M, as was previously demonstrated for the reduced, carboxymethylated derivative of this protein. The [NaCl]-dependent folding/unfolding equilibrium for GS-RNase T-1 was reversible and could be influenced by urea. Fluorescence studies indicated that GS-alpha-lactalbumin showed a [NaCl]-dependent partial shift toward a more nativelike state, which was enhanced by the presence of Ca2+ ions. Both of the GS derivatives stimulated the ATPase activity of BiP, with apparent affinities in the range 0.1-1.0 mM. The results indicate that these GS-S-protein mixed disulfide derivatives are ideal model unfolded proteins that can be used as substrates for detailed studies on secretory protein folding in vitro and on the interactions between unfolded proteins and facilitators of protein folding.

Item Type: Article
Subjects: Q Science > QP Physiology (Living systems) > QP517 Biochemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: P. Ogbuji
Date Deposited: 19 Jun 2009 09:28
Last Modified: 16 Jun 2014 14:17
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