A Proton Magnetic Relaxation Study of Ferric Myoglobin and Haemoglobin in Water/Ethanediol Solutions (CROSBI ID 106719)
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Podaci o odgovornosti
Vuk-Pavlović, Stanimir ; Bračika, Vlasta ; Benko, Bojan ; Maričić, Siniša
engleski
A Proton Magnetic Relaxation Study of Ferric Myoglobin and Haemoglobin in Water/Ethanediol Solutions
Structural alterations of the haem vicinity of the high-spin derivatives of bovine ferric myoglobin (metmyoglobin) and human haemoglobin and the changes of the interaction with inositol hexaphosphate induced by ethanediol were monitored by solvent-proton magnetic relaxation. On addition of ethanediol up to 60% the fluoromet derivatives exhibit a gradual increase in the accessibility of the haem for the molecules from the solvent. In aquomethaemoglobin solutions with more than 25% ethanediol there is no unique explanation of proton magnetic relaxation. Ethanediol enhances the binding of inositol hexaphosphate to methaemoglobin, but the structural consequences of this binding on the haem-pockets seem to be diminished. The mechanisms of the observed structural and functional alterations of myoglobin as well as haemoglobin tetramer are discussed here.
Haemoglobin; Inositol hexaphosphate; Mixed solvent; Myoglobin; Proton magnetic relaxation
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Povezanost rada
Fizika, Kemija, Biologija