Study of in vitro interaction between tetrabromobisphenol A and bovine serum albumin by fluorescence spectroscopy

Authors

  • Yingxin Wu,

    1. State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing, People's Republic of China
    2. School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, People's Republic of China
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  • Yan Qian,

    1. State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing, People's Republic of China
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  • Hao Cui,

    1. State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing, People's Republic of China
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  • Xiaomin Lai,

    1. State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing, People's Republic of China
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  • Xianchuan Xie,

    1. State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing, People's Republic of China
    2. Key Laboratory of Soil Environment and Pollution Remediation, Chinese Academy of Sciences, Nanjing, People's Republic of China
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  • Xiaorong Wang

    1. State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing, People's Republic of China
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  • X. Xie and X. Wang are equal contributors to this paper.

Abstract

The interaction between tetrabromobisphenol A (TBBPA) and bovine serum albumin (BSA) in simulated physiological conditions (pH = 7.4) was investigated by fluorescence spectroscopy. The results revealed that TBBPA caused the fluorescence quenching of BSA through a static quenching procedure. The binding constants (K) of TBBPA with BSA at 277, 298, and 310 K were obtained as 4.75 × 105 L/mol, 5.63 × 105 L/mol, and 6.66 × 105 L/mol, respectively. There may be two binding sites of TBBPA on BSA. The enthalpy change (ΔH), free energy change (ΔG), and entropy change (ΔS) of thermodynamic parameters indicated that the interaction between TBBPA and BSA was driven mainly by hydrophobic and electrostatic forces. Synchronous fluorescence spectra showed TBBPA binding slightly changed the conformation of BSA by decreasing its polarity and increasing its hydrophobicity. The results of the present study may provide valuable information for studying the distribution and toxicity mechanisms of TBBPA in vivo. Environ. Toxicol. Chem. 2011;30:2697–2700. © 2011 SETAC

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