Magnetic Studies on the Ferri-haem Undecapeptide of Cytochrome c
| Autor: | Ahmed M. T. Jehanli, David A. Stotter, Michael T. Wilson |
|---|---|
| Rok vydání: | 1976 |
| Předmět: |
Magnetic Resonance Spectroscopy
Titration curve Cytochrome Iron Inorganic chemistry Cytochrome c Group Heme Biochemistry Spin crossover Animals Horses Amino Acids Aqueous solution Magnetic moment biology Chemistry Cytochrome c digestive oral and skin physiology Hydrogen-Ion Concentration equipment and supplies Crystallography biology.protein Hemin Isoelectric Focusing Oligopeptides human activities |
| Zdroj: | European Journal of Biochemistry. 71:613-616 |
| ISSN: | 1432-1033 0014-2956 |
| Popis: | The pH-dependence of the magnetic moment of a ferri-haem undecapeptide, produced by peptic digestion of cytochrome c, has been measured in aqueous solution using a nuclear magnetic resonance method. Below pH 3 the magnetic moment is consistent with the presence of hydroxo-bridged dimers of high-spin iron(III). Above pH 7 the iron(III) is low-spin, the spin crossover conforming to a simple titration curve with pK 6.3 (n= 1). This transition is discussed with reference to spectrophotometric studies of ligand binding at the haem. |
| Databáze: | OpenAIRE |
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