|
|||||
|
|
Binding of rare earth metal complexes with an ofloxacin derivative to bovine serum albumin and its effect on the conformation of protein |
|
| Authors: | Min Xu Feng-Juan Chen Liang Huang Pin-xian Xi Zheng-zhi Zeng |
| Institution: | a Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Lanzhou University, Lanzhou 730000, China b State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China c College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China |
| Abstract: | The water-soluble Pr (Ⅲ) and Nd (Ⅲ) complexes with an ofloxacin derivative have been prepared and characterized. The single-crystal X-ray diffraction showed that the Pr (III) and Nd (III) complexes have the similar molecular structure. Under physiological pH condition, the effects of PrL(NO3)2(CH3OH)](NO3) and NdL(NO3)2(CH3OH)](NO3) on bovine serum albumin (BSA) were examined using fluorescence spectroscopy in combination with UV-vis absorbance and circular dichroism (CD) spectra. The result reveals that the quenching mechanism of fluorescence of BSA by two complexes is a static quenching process and the number of binding sites is about 1 for both. The thermodynamic parameters (ΔH=−14.52 kJ mol−1, ΔS=56.54 J mol−1 K−1 for PrL(NO3)2(CH3OH)](NO3) and ΔH=−24.63 kJ mol−1, ΔS=22.07 J mol−1 K−1 for NdL(NO3)2(CH3OH)](NO3)) indicate that hydrophobic and electrostatic interactions are the main binding force in the complexes-BSA system. The binding average distance between complexes and BSA was obtained on the basis of Förster's theory. In addition, it was proved by the CD spectra that the BSA secondary structure was changed in the presence of complexes in an aqueous solution. |
| Keywords: | Rare earth metal complexes Bovine serum albumin Fluorescence spectroscopy Circular dichroism spectra |
| 本文献已被 ScienceDirect 等数据库收录！ | |