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- W2079896726 abstract "The interaction of hemoglobin with phosphatidylserine vesicles at low ionic strength and pH conditions was studied. The fluorescence intensity of a lipid embedded probe was quenched by bound Hb but could not be reversed by an elevation of ionic strength and pH. The irreversibility of the fluorescence quenching is a time-dependent process associated with changes in the heme Soret and visible spectra. The rate of these changes was much faster for methemoglobin than for either cyanomethemoglobin or oxyhemoglobin. Elevation of ionic strength released out of the bound hemoglobin into the water phase most of the globin but only a small fraction of the heme. The data are interpreted as demonstrating the ability of phosphatidylserine vesicles to compete with globin for the heme group. When Hb binds to the liposome, heme is being transferred into the lipid phase and the rate-limiting step is the dissociation of the heme-globin complex. The fact that binding of heme to the lipid vesicles is very strong was demonstrated by the failure of hemin to interact with globin when the two were rapidly mixed in the presence of phosphatidylserine vesicles. A multi-step process is suggested to explain the results of Hb phosphatidylserine interaction." @default.
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- W2079896726 date "1982-04-01" @default.
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- W2079896726 title "The interaction of hemoglobin with phosphatidylserine vesicles" @default.
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- W2079896726 doi "https://doi.org/10.1016/0005-2736(82)90170-5" @default.
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