Effects of monovalent cations on cytochrome P-450 camphor. Evidence for preferential binding of potassium.

Abstract

Binding of monovalent cations of increasing ionic radius to ferric cytochrome P-450cam was measured. Potassium has the highest affinity for the cation binding site observed in the X-ray crystallographic structure with Kdcat = 12 mM, compared with the smaller cation lithium, (Kdcat = 37 mM) and the larger cation cesium (Kd cat = 20 mM). Coupling between… (More)

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