Abstract
Polychlorinated biphenyls (PCBs) are potentially hazardous to the environment because of their chemical stability and biological toxicity. In this study, we identified the binding mode of a representative PCB180 to human serum albumin (HSA) using fluorescence and molecular dynamics (MD) simulation methods. PCB180 bound exactly at subdomain IIIA of HSA based on the fluorescence study along with site marker displacement experiments. PCB180 also induced conformational changes that were governed mainly by hydrophobic forces. MD studies and free energy calculations also made important contributions to the understanding of the effects of an HSA-PCB180 system on conformational changes. The simulations on binding behavior proved that PCB180 was located only in subdomain IIIA. Hydrophobic interactions dominated the mode of binding behavior. The results obtained using the two methods correlated well with each other. Our findings provide a framework for elucidating the mechanisms of PCB180-HSA binding, and may also help in further research on the transportation, distribution, and toxicity effects of PCBs when introduced into human blood serum.
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Acknowledgments
This work was supported financially by National Natural Science Foundation of China (NO. 31000017) (NO. 21207056), the Natural Foundation of Gansu Province (1104WCGA187) and Key Laboratory of Chemistry and Quality for Traditional Chinese Medicines of the College of Gansu Province, Gansu College of Traditional Chinese Medicine (Zzy-2011-03).
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Senbiao Fang and Huanhuan Li contributed equally to this work.
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Fang, S., Li, H., Liu, T. et al. Molecular interaction of PCB180 to human serum albumin: insights from spectroscopic and molecular modelling studies. J Mol Model 20, 2098 (2014). https://doi.org/10.1007/s00894-014-2098-7
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DOI: https://doi.org/10.1007/s00894-014-2098-7