Physicochemical characterisation of dihydro-alpha-lipoic acid interaction with human serum albumin by multi-spectroscopic and molecular modelling approach Scientific paper

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Nikola Gligorijević
https://orcid.org/0000-0002-8691-2486
Vladimir Šukalović
https://orcid.org/0000-0002-0216-5760
Simeon Minić
Goran Miljuš
Olgica Nedić
https://orcid.org/0000-0003-2042-0056
Ana Penezić
https://orcid.org/0000-0002-2539-4507

Abstract

The binding of a popular food supplement and well-known anti­oxidant, dihydro-alpha-lipoic acid (DHLA) to human serum albumin (HSA) was characterised. The binding was monitored by several spectroscopic methods together with the molecular docking approach. HSA was able to bind DHLA with moderate affinity, 1.00±0.05×104 M-1. Spectroscopic data demon­strated that the preferential binding site for DHLA on HSA is IIA (Sudlow I). Both experimental and molecular docking analysis identified electrostatic (salt bridges) and hydrogen bonds as the key interactions involved in DHLA binding to HSA. Molecular docking confirmed that the Sudlow I site could accom­mo­date DHLA and that the ligand is bound to the protein in a specific conform­ation. The molecular dynamic simulation showed that the formed complex is stable. Binding of DHLA does not affect the structure of the protein, but it thermally stabilises HSA. Bound DHLA had no effect on the susceptibility of HSA to trypsin digestion. Since DHLA is a commonly used food supplement, knowledge of its pharmacokinetics and pharmacodynamic properties in an org­anism is very important. This study further expands it by providing a detailed analysis of its interaction with HSA, the primary drug transporter in the circul­ation.

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How to Cite
[1]
N. Gligorijević, V. Šukalović, S. Minić, G. Miljuš, O. Nedić, and A. Penezić, “Physicochemical characterisation of dihydro-alpha-lipoic acid interaction with human serum albumin by multi-spectroscopic and molecular modelling approach: Scientific paper”, J. Serb. Chem. Soc., vol. 86, no. 9, pp. 765-807, Aug. 2021.
Section
Biochemistry & Biotechnology

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