Exploring the binding mechanisms of inorganic magnetic nanocarrier containing L-Dopa with HSA protein utilizing multi spectroscopic techniques

• Published in: Journal of biomolecular structure & dynamics 2021-12, Vol.39 (18), p.7160-7167
• Main Authors: Shahabadi, Nahid, Razlansari, Mahtab
• Format: Article
• Language: English
• Subjects: binding constant; HSA; L-Dopa; Multi spectroscopy
• ISSN: 0739-1102; 1538-0254
• DOI: 10.1080/07391102.2020.1806929

In this study, the interaction of Fe 3 O 4 @CaAl-LDH@L-Dopa nanoparticles (NPs) with human serum albumin (HSA) was investigated in simulated physiological conditions applying UV-visible, fluorescence, and circular dichroism (CD) spectroscopic techniques. The consequences of UV-vis and CD spectroscopy demonstrated that the interaction of HSA to Fe 3 O 4 @CaAl-LDH@L-Dopa NPs enforced some conformational alterations within HSA. The fluorescence spectroscopy analysis indicated that by enhancing temperature, the Stern-Volmer quenching constant (K sv ) was decreased, which is relevant to a static quenching mechanism. The binding constant (K b ) was 7.07 × 10 4 M −1 while the number of the binding site (n) was 0.94 which is in compromise with its binding constant. Also, thermodynamic parameters (ΔH° > 0, ΔG° < 0, and ΔS° > 0) have suggested that hydrophobic forces perform a key role in the interaction of HSA with Fe 3 O 4 @CaAl-LDH@L-Dopa NPs. Displacement studies successfully carried out using the Warfarin and Ibuprofen have predicted that the binding of Fe 3 O 4 @CaAl-LDH@L-Dopa NPs to HSA is situated at site II (subdomain IIIA). Communicated by Ramaswamy H. Sarma