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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 95 (1973), S. 904-908 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1293-1304 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The molar magnetic susceptibility of ferrihemoglobin solutions, as a function of pH and temperature using the nmr technique of Evans, in water and 5% t-butanol has been determined. Results suggest that within a small pH region, the conventional analysis of magnetic susceptibility in terms of high-spin and low-spin contributions breaks down. The implication of this is discussed in terms of possible conformational change involving two subspecies. The effect of t-butanol is also discussed in terms of the t-butanol effect on water.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 1147-1167 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Interest in the thermodynamics of the iron-binding site in hemoproteins has increased in recent years due to refinements in x-ray crystallographic studies of hemoproteins [see Deathage, J. F., Lee, R. S., Anderson, C. M. & Moffat, K. (1976) J. Mol. Biol. 104, 687-706; Heidner, E. J., Ladner, R. C. & Perutz, M. F. (1976) J. Mol. Biol. 104, 707-722; Deathage, J. F., Lee, R. S. & Moffat, K. (1976) J. Mol. Biol. 104, 723-728; Ladner, R. C., Heidner, E. J. & Perutz, M. F. (1976) J. Mol. Biol. 114, 385-414; Fermi, G. & Perutz, M. F. (1977) J. Mol. Biol. 114, 421-431; Takano, T. (1977) J. Mol. Biol. 110, 537-568 and 569-589], the synthesis and x-ray analysis of model heme compounds [see Scheidt, W. R. (1977) Acc. Chem. Res. 10, 339-345; Kastner, M. E., Scheidt, W. R., Mashino, T. & Reed, C. A. (1978) J. Am. Chem. Soc. 100, 666-667; Mashiko, T., Kastner, M. E., Spartalian, K., Scheidt, W. R. & Reed, C. A. (1978) J. Am. Chem. Soc. 100, 6354-6362; Hill, H. A. O., Skite, P. P., Buchler, J. W., Luchr, H., Tonn, M., Gregson, A. K. & Pellizer, G. (1979) Chem. Commun. 4, 151-152; and Scheidt, W. R., Cohen, I. A. & Kastner, M. E. (1979) Biochemistry 18, 3546-3556], and the numerous data on heme-protein interactions that account for the differences observed in ligand binding between the various species of animals. Numerous probes have been used and provide information about the structure and thermodynamics of the binding site, but no single probe can provide the complete picture [see Iizuka, T. & Yonetani, T. (1970) Adv. Biophys. 1, 157-182; Smith, D. W. & Williams, R. J. P. (1970) Struct. Bond. 7, 1-45; and Spiro, T. G. (1975) Biochim. Biophys. Acta 416, 169-189].
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have studied the binding of azide ion to ferrihemoglobin at elevated temperatures. Up to a temperature of 45°C there is no difference in the ligand binding behavior of hemoglobin when compared with the results obtained at lower temperatures. The compensation temperature Tc of 290.6 ± 5.3°K, obtained in this study within the temperature range 303-318°K, confirms that the compensation pattern obtained by Lumry and Rajender is not dependent on the temperature range of the experiment but an intrinsic property of the protein conformation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1305-1307 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Measurements of the magnetic susceptibility of guinea pig, human A, and pigeon ferrihemoglobins as a function of pH at 30°C demonstrate maxima very near the extrema found for the standard enthalpies and standard entropies of ligand binding, i.e., at the so-called “characteristic pH” values, which are very different for these three species. Ligand binding is dependent on spin state, at least through the characteristic pH behavior, which is not yet understood.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The binding of azide ion to horse-heart myoglobins has been studied at pH 6.98 and at various temperatures. The results show that the azide complex is not completely loe spin and that the spin population is strongly dependent on temperature. We have shown that with some assumption it is possible to calculate the approximate fraction of high and low spin present at any temperature from the absorbance measurements. Corrections to the spin contribution at pH 6.98 to these values has been calculated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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