Abstract
The addition of HCl, at low ionic strength, to the native state of apomyoglobin, beta-lactamase, and cytochrome c caused these proteins to adopt an essentially fully unfolded conformation in the vicinity of pH 2. However, contrary to expectation, the addition of further acid resulted in refolding to a compact conformation with the properties of a molten globule. The major factor responsible for the refolding is believed to be the binding of the anion, which minimizes the intramolecular charge repulsion that initially brought about the unfolding.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Arakawa T., Hsu Y. R., Yphantis D. A. Acid unfolding and self-association of recombinant Escherichia coli derived human interferon gamma. Biochemistry. 1987 Aug 25;26(17):5428–5432. doi: 10.1021/bi00391a032. [DOI] [PubMed] [Google Scholar]
- Aune K. C., Salahuddin A., Zarlengo M. H., Tanford C. Evidence for residual structure in acid- and heat-denatured proteins. J Biol Chem. 1967 Oct 10;242(19):4486–4489. [PubMed] [Google Scholar]
- Aviram I. The interaction of chaotropic anions with acid ferricytochrome c. J Biol Chem. 1973 Mar 25;248(6):1894–1896. [PubMed] [Google Scholar]
- Babul J., Stellwagen E. Participation of the protein ligands in the folding of cytochrome c. Biochemistry. 1972 Mar 28;11(7):1195–1200. doi: 10.1021/bi00757a013. [DOI] [PubMed] [Google Scholar]
- Collins K. D., Washabaugh M. W. The Hofmeister effect and the behaviour of water at interfaces. Q Rev Biophys. 1985 Nov;18(4):323–422. doi: 10.1017/s0033583500005369. [DOI] [PubMed] [Google Scholar]
- Corbett R. J., Roche R. S. Use of high-speed size-exclusion chromatography for the study of protein folding and stability. Biochemistry. 1984 Apr 10;23(8):1888–1894. doi: 10.1021/bi00303a047. [DOI] [PubMed] [Google Scholar]
- Dyson H. J., Beattie J. K. Spin state and unfolding equilibria of ferricytochrome c in acidic solutions. J Biol Chem. 1982 Mar 10;257(5):2267–2273. [PubMed] [Google Scholar]
- Goto Y., Fink A. L. Conformational states of beta-lactamase: molten-globule states at acidic and alkaline pH with high salt. Biochemistry. 1989 Feb 7;28(3):945–952. doi: 10.1021/bi00429a004. [DOI] [PubMed] [Google Scholar]
- Hapner K. D., Bradshaw R. A., Hartzell C. R., Gurd F. R. Comparison of myoglobins from harbor seal, porpoise, and sperm whale. I. Preparation and characterization. J Biol Chem. 1968 Feb 25;243(4):683–689. [PubMed] [Google Scholar]
- Ohgushi M., Wada A. 'Molten-globule state': a compact form of globular proteins with mobile side-chains. FEBS Lett. 1983 Nov 28;164(1):21–24. doi: 10.1016/0014-5793(83)80010-6. [DOI] [PubMed] [Google Scholar]
- Stellwagen E., Babul J. Stabilization of the globular structure of ferricytochrome c by chloride in acidic solvents. Biochemistry. 1975 Nov 18;14(23):5135–5140. doi: 10.1021/bi00694a018. [DOI] [PubMed] [Google Scholar]
- Tanford C. Protein denaturation. Adv Protein Chem. 1968;23:121–282. doi: 10.1016/s0065-3233(08)60401-5. [DOI] [PubMed] [Google Scholar]
- Tsong T. Y. An acid induced conformational transition of denatured cytochrome c in urea and guanidine hydrochloride solutions. Biochemistry. 1975 Apr 8;14(7):1542–1547. doi: 10.1021/bi00678a031. [DOI] [PubMed] [Google Scholar]
- Wong K. P., Hamlin L. M. Acid denaturation of bovine carbonic anhydrase B. Biochemistry. 1974 Jun 18;13(13):2678–2683. doi: 10.1021/bi00710a003. [DOI] [PubMed] [Google Scholar]