title: A CRITICAL STUDY ON THE INTERACTIONS OF HESPERITIN WITH HUMAN HEMOGLOBIN: FLUORESCENCE SPECTROSCOPIC AND MOLECULAR MODELING APPROACH.
abstract: Hesperitin, a ubiquitous bioactive flavonoid abundant in citrus fruits is known to possess antioxidant, anti-carcinogenic, hypolipidemic, vasoprotective and other important therapeutic properties. Here we have explored the interactions of hesperitin with normal human hemoglobin (HbA), using steady state and time resolved fluorescence spectroscopy, far UV circular dicroism (CD) spectroscopy, combined with molecular modeling computations. Specific interaction of the flavonoid with HbA is confirmed from flavonoid-induced static quenching which is evident from steady state fluorescence as well as lifetime data. Both temperature dependent fluorescence measurements and molecular docking studies reveal that apart from hydrogen bonding and van der Waals interactions, electrostatic interactions also play crucial role in hesperitin-HbA interactions. Furthermore, electrostatic surface potential calculations indicate that the hesperitin binding site in HbA is intensely positive due to the presence of several lysine and histidine residues.
authors.affiliation: Saroj Mohan Institute of Technology, Hooghly, India.
authors.forename: Sandipan
authors.initials: S
authors.lastname: Chakraborty
authors.forename: Sudip
authors.initials: S
authors.lastname: Chaudhuri
authors.forename: Biswapathik
authors.initials: B
authors.lastname: Pahari
authors.forename: Jasmine
authors.initials: J
authors.lastname: Taylor
authors.forename: Pradeep K
authors.initials: PK
authors.lastname: Sengupta
authors.forename: Bidisha
authors.initials: B
authors.lastname: Sengupta