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Absorption spectra of different ligand derivative;s of kidney bean leghemoglobin alpha have been recorded. The effect of pH on the absorption spectra of kidney bean leghemoglobin alpha has been studied. The pK of the acid-alkaline transition of the heme-linked water molecule is 8.25 and the pK for the acid dissociation of the heme group is 4.03. Affinities of kidney bean leghemoglobin for two different types of ligands have been studied in comparison with soybean leghemoglobins alpha and c and sperm whale myoglobin. All these leghemoglobins have similar affinities for the small anionic ligand fluoride ion, and they are only slightly more accessible to this ligand than is sperm whale myoglobin. Differences in the primary structure or in conformation of these proteins are reflected in the affinity for the bulky ligand imidazole. The accessibility to imidazole increases in the order sperm whale myoglobin less than soybean Lbalpha less than soybean Lbc less than kidney bean Lbalpha, and also low spin Lbalpha less than high spin Lbalpha. The results are discussed with respect to the amino acid sequences of the leghemoglobins.

acta chemica scandinavica/acta chemica scandinavica. b, organic chemistry and biochemistry/acta chemica scandinavica. a, physical and inorganic chemistry/acta chemica scandinavica. series b. organic chemistry and biochemistry/acta chemica scandinavica. series a, physical and inorganic chemistry

Studies on Ligand Binding of Kidney Bean Leghemoglobin.