Tayyab, Saad and Francis, Jaslene Anne and Kabir, Md Zahirul and Ghani, Hamidah and Mohamad, Saharuddin (2019) Probing the interaction of 2,4-dichlorophenoxyacetic acid with human serum albumin as studied by experimental and computational approaches. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 207. pp. 284-293. ISSN 1386-1425, DOI https://doi.org/10.1016/j.saa.2018.09.033.
Full text not available from this repository.Abstract
To characterize the binding of a widely used herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D) to the major transporter in human circulation, human serum albumin (HSA), multi-spectroscopic approaches such as fluorescence, absorption and circular dichroism along with computational methods were employed. Analysis of the fluorescence and absorption spectroscopic data confirmed the 2,4-D–HSA complex formation. A static quenching mechanism was evident from the inverse temperature dependence of the KSV values. The complex was stabilized by a weak binding affinity (Ka = 5.08 × 103 M−1 at 298 K). Quantitative analysis of thermodynamic data revealed participation of hydrophobic and van der Waals interactions as well as hydrogen bonds in the binding process. Circular dichroism and three-dimensional fluorescence spectral results showed structural (secondary and tertiary) changes in HSA as well as microenvironmental perturbation around protein fluorophores (Trp and Tyr residues) upon 2,4-D binding. Addition of 2,4-D to HSA was found to improve protein's thermal stability. Competitive displacement results as well as computational analyses suggested preferred location of the 2,4-D binding site as Sudlow's site I (subdomain IIA) in HSA.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Higher Education, Government of Malaysia and the University of Malaya: High Impact Research MoE Grant (grant number UM.C/625/1/HIR/MoE/SC/02) |
| Uncontrolled Keywords: | 2,4-Dichlorophenoxyacetic acid; Human serum albumin; Herbicide–protein interaction; Fluorescence quenching; Computational analysis |
| Subjects: | Q Science > Q Science (General) Q Science > QH Natural history |
| Divisions: | Faculty of Science > Institute of Biological Sciences |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 14 Jan 2019 06:39 |
| Last Modified: | 14 Jan 2019 06:39 |
| URI: | http://eprints.um.edu.my/id/eprint/19978 |
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