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Effects of urea, metal ions and surfactants on the binding of baicalein with bovine serum albumin()

The interaction of baicalein with bovine serum albumin (BSA) was investigated with the help of spectroscopic and molecular docking studies. The binding affinity of baicalein towards BSA was estimated to be in order of 10(5) M(−1) from fluorescence quenching studies. Negative ΔH° (−5.66±0.14 kJ/mol)...

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Detalles Bibliográficos
Autores principales: Roy, Atanu Singha, Dinda, Amit Kumar, Pandey, Nitin Kumar, Dasgupta, Swagata
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Xi'an Jiaotong University 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5762607/
https://www.ncbi.nlm.nih.gov/pubmed/29403991
http://dx.doi.org/10.1016/j.jpha.2016.04.001
Descripción
Sumario:The interaction of baicalein with bovine serum albumin (BSA) was investigated with the help of spectroscopic and molecular docking studies. The binding affinity of baicalein towards BSA was estimated to be in order of 10(5) M(−1) from fluorescence quenching studies. Negative ΔH° (−5.66±0.14 kJ/mol) and positive (ΔS°) (+79.96±0.65 J/mol K) indicate the presence of electrostatic interactions along with the hydrophobic forces that result in a positive ΔS°. The hydrophobic association of baicalein with BSA diminishes in the presence of sodium dodecyl sulfate (SDS) due to probable hydrophobic association of baicalein with SDS, resulting in a negative ΔS° (−40.65±0.87 J/mol K). Matrix-assisted laser desorption ionization/time of flight (MALDI--TOF) experiments indicate a 1:1 complexation between baicalein and BSA. The unfolding and refolding phenomena of BSA were investigated in the absence and presence of baicalein using steady-state and fluorescence lifetime measurements. It was observed that the presence of urea ruptured the non-covalent interaction between baicalein and BSA. The presence of metal ions (Ag(+), Mg(2+), Ni(2+), Mn(2+), Co(2+)and Zn(2+)) increased the binding affinity of ligand towards BSA. The changes in conformational aspects of BSA after ligand binding were also investigated using circular dichroism (CD) and Fourier transform infrared (FT-IR) spectroscopic techniques. Site selectivity studies following molecular docking analyses indicated the binding of baicalein to site 1 (subdomain IIA) of BSA.