Abstract
Binding of the drug phenosafranine to hemoglobin (Hb) in aqueous solutions was investigated by fluorescence, UV/vis and circular dichroism (CD) spectral methods at pH=7.4. The fluorescence data showed that fluorescence quenching of Hb by phenosafranine is the result of formation of a phenosafranine–Hb complex with a 1:1 molar ratio. Thermodynamic analysis implied that hydrophobic, electrostatic and hydrogen bond interactions are all involved in stabilizing the complex. The molecular distance (r=4.29 nm) between the donor (Hb) and acceptor (phenosafranine) was calculated according to Förster’s theory. The features of phenosafranine-induced secondary structure changes of Hb have been studied by synchronous fluorescence, CD and three-dimensional fluorescence spectroscopy. This study improves our knowledge of the interaction dynamics of phenazinium drugs to the physiologically important protein Hb.
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Abbreviations
- Hb:
-
hemoglobin
- Trp:
-
tryptophan
- Tyr:
-
tyrosine
- Phe:
-
phenylalanine
- CD:
-
circular dichroism
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Liu, W., Ding, F. & Sun, Y. Characterization of Phenosafranine–Hemoglobin Interactions in Aqueous Solution. J Solution Chem 40, 231–246 (2011). https://doi.org/10.1007/s10953-010-9647-1
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DOI: https://doi.org/10.1007/s10953-010-9647-1