Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (8): 1354.doi: 10.7503/cjcu20170203

• Organic Chemistry • Previous Articles     Next Articles

Characterization of the Interaction Between Esterified TAM Radical and Bovine Serum Albumin

AN Pengjiao1, YU Nannan1, SUN Ruisheng1, SUI Xiaofang2, SONG Yuguang1   

  1. 1. Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, China;
    2. First Affiliated Hospital of Jiamusi University, Jiamusi 154002, China
  • Received:2017-04-01 Revised:2017-07-12 Online:2017-08-10 Published:2017-07-12
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.31500684, 21572161), the Tianjin Research Program of Application Foundation and Advanced Technology, China(Nos.15JCYBJC23700, 15JCZDJC32300) and the National Undergraduate Training Programs for Innovation and Entrepreneurship, China(No.201510062002).

Abstract:

Fully substituted tetrathiatriarylmethyl(TAM) radicals and their derivatives are ideal electron paramagnetic resonance(EPR) spectroscopy/imaging probe and have been received much concern in NMR contrast agent or spin traps fields. This work demonstrated that an esterified TAM radical(ET-03) bound to bovine serum albumin(BSA) in aqueous solution with fluorescence, electron paramagnetic resonance(EPR) spectroscopy, UV-Vis spectroscopy and molecular docking. The results showed that ET-03 spontaneously bound to BSA. The binding between ET-03 and BSA was driven by a hydrophobic interaction and the binding site was mainly determined to be the sub-domain ⅡA(Sudlow's site Ⅰ) and the sub-domain ⅢA(Sudlow's site Ⅱ). The fluorescence quenching of BSA by ET-03 was a mixture of static and dynamic mechanism with energy transfer probably. This protein binding of the esterified TAM probe to albumin can be used to study the structure and function of albumin and also must be considered for its use as an in vivo imaging agent or spin label.

Key words: Tetrathiatriarylmethyl radical, Ester derivative, Bovine serum albumin, Fluorescent quenching, Electron paramagnetic resonance(EPR) spectroscopy

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