Ligand binding and protein relaxation in heme proteins: a room temperature analysis of NO geminate recombination.

Abstract

Ultrafast absorption spectroscopy is used to study heme-NO recombination at room temperature in aqueous buffer on time scales where the ligand cannot leave its cage environment. While a single barrier is observed for the cage recombination of NO with heme in the absence of globin, recombination in hemoglobin and myoglobin is nonexponential. Examination of… (More)

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