Abstract
The interactions of fluoride, acetate and formate with soybean ferric leghemoglobin a have been investigated by 1H NMR spectroscopy. In the presence of fluoride or acetate leghemoglobin is locked into a high spin ferric conformation whilst the formate complex exists as an equilibrium mixture of high and low spin states. Both formate and acetate ligate directly to the iron and the different magnetic properties of the complexes are attributed to steric constraints within the heme pocket.
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