Natural alkaloid Luotonin A and its affixed acceptor molecules: Serum albumin binding studies

Effective interaction of natural alkaloid Luotonin A (L) and its affixed acceptor molecules 1 and 2 with donor molecule as Bovine serum albumin (BSA) at various pH (4.0, 7.4 and 10.0) medium have been demonstrated using various conventional spectroscopic techniques. These analyses provide some valua...

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Veröffentlicht in:Journal of photochemistry and photobiology. B, Biology Biology, 2017-08, Vol.173, p.499-507
Hauptverfasser: Kesavan, Mookkandi Palsamy, Kumar, Gujuluva Gangatharan Vinoth, Anitha, Kandasamy, Ravi, Lokesh, Raja, Jeyaraj Dhaveethu, Rajagopal, Gurusamy, Rajesh, Jegathalaprathaban
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Sprache:eng
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Zusammenfassung:Effective interaction of natural alkaloid Luotonin A (L) and its affixed acceptor molecules 1 and 2 with donor molecule as Bovine serum albumin (BSA) at various pH (4.0, 7.4 and 10.0) medium have been demonstrated using various conventional spectroscopic techniques. These analyses provide some valuable features on the interaction between BSA and acceptor molecules (L, 1 and 2). From the absorption and fluorescence spectral titration studies, the formation of ground-state complexes between the acceptor molecules (L, 1 and 2) and the BSA have been confirmed. The results of the afore titrations analysis reveal that, the strong binding of receptor 1 with BSA (Kapp 5.68×104M−1; KSV 1.86×106Lmol−1; Ka 6.42×105Lmol−1; Kass 8.09×106M−1; ΔG −33.35kJ/mol) at physiological pH medium (7.4) than other receptor molecules 2 and L. The Förster resonance energy transfer (FRET) efficiency between the tryptophan (Trp) residues of BSA and acceptor molecules L, 1 and 2 during the interaction, are 28.85, 85.24 and 53.25 % respectively. The superior binding efficacy of acceptor 1 at physiological pH condition has been further confirmed by FT-IR and Raman spectral analysis methods. Moreover, theoretical docking studies of acceptors L, 1 and 2 towards HSA have been demonstrated to differentiate their binding behaviours. It reveals that, acceptor 1 has the strongest binding ability with HSA through two hydrogen bonding and the Atomic contact energy (ACE) value of −483.96kcal/mol. [Display omitted] •The natural alkaloid L and its affixed acceptor molecules 1 and 2•Their interaction with the BSA are investigated at various pH medium.•Acceptor 1 has superior BSA binding efficacy at physiological pH condition.•Docking studies of acceptors towards HSA have been demonstrated.•Acceptor 1 has strongest binding ability with HSA via two hydrogen bonding.
ISSN:1011-1344
1873-2682
DOI:10.1016/j.jphotobiol.2017.06.030