NDLI: Thermal denaturation of iso-1-cytochrome c variants: comparison with solvent denaturation.

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Thermal denaturation of iso-1-cytochrome c variants: comparison with solvent denaturation.

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Thermal denaturation of iso-1-cytochrome c variants: comparison with solvent denaturation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Bowler, B. E. Herrmann, L. M.
Description	Country affiliation: United States Author Affiliation: Herrmann LM ( Department of Chemistry and Biochemistry, University of Denver, Colorado 80208-2436, USA.)
Abstract	Thermal denaturation studies as a function of pH were carried out on wild-type iso-1-cytochrome c and three variants of this protein at the solvent-exposed position 73 of the sequence. By examining the enthalpy and Tm at various pH values, the heat capacity increment (delta Cp), which is dominated by the degree of change in nonpolar hydration upon protein unfolding, was found for the wild type where lysine 73 is normally present and for three variants. For the Trp 73 variant, the delta Cp value (1.15 +/- 0.17 kcal/mol K) decreased slightly relative to wild-type iso-1-cytochrome c (1.40 +/- 0.06 kcal/mol K), while for the Ile 73 (1.65 +/- 0.07 kcal/mol K) and the Val 73 (1.50 +/- 0.06 kcal/mol K) variants, delta Cp increased slightly. In previous studies, the Trp 73, Ile 73, and Val 73 variants have been shown to have decreased m-values in guanidine hydrochloride denaturations relative to the wild-type protein (Hermann L, Bowler BE, Dong A, Caughey WS. 1995. The effects of hydrophilic to hydrophobic surface mutations on the denatured state of iso-1-cytochrome c: Investigation of aliphatic residues. Biochemistry 34:3040-3047). Both the m-value and delta Cp are related to the change in solvent exposure upon unfolding and other investigators have shown a correlation exists between these two parameters. However, for this subset of variants of iso-1-cytochrome c, a lack of correlation exists which implies that there may be basic differences between the guanidine hydrochloride and thermal denaturations of this protein. Spectroscopic data are consistent with different denatured states for thermal and guanidine hydrochloride unfolding. The different response of m-values and delta Cp for these variants will be discussed in this context.
ISSN	09618368
e-ISSN	1469896X
Journal	Protein Science
Issue Number	3
Volume Number	6
Language	English
Publisher	Wiley-Blackwell (on behalf of The Protein Society)
Publisher Date	1997-03-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Cytochrome c Group Chemistry Cytochromes c Saccharomyces Cerevisiae Proteins Solvents Circular Dichroism Genetics Hot Temperature Mutagenesis, Site-directed Protein Denaturation Thermodynamics Comparative Study Research Support, U.s. Gov't, Non-p.h.s. Discipline Biochemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Biology Biochemistry

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