Spectroscopy and Spectral Analysis, Volume. 29, Issue 3, 773(2009)
Study on Interaction Mechanism between Meso-Tetra-(4-Hydroxyphenyl)-Zn Porphyrin and Bovine Serum Albumin by Fluorescence Method
In the present paper,the binding reaction between meso-tetra-(4-hydroxyphenyl)-Zn porphyrin (TPP-Zn) and bovine serum albumin (BSA) was studied at different temperatures by fluorescence method.It was shown that meso-tetra-(4-hydroxyphenyl)-Zn porphyrin has a strong ability of quenching the fluorescence of bovine serum albumin.Based on the mechanisms of fluorescence quenching of bovine serum albumin caused by meso-tetra-(4-hydroxyphenyl)-Zn porphyrin,the binding constants between meso-tetra-(4-hydroxyphenyl)-Zn porphyrin and bovine serum albumin were measured under different temperatures.The experiment showed that meso-tetra-(4-hydroxyphenyl)-Zn porphyrin and bovine serum albumin have strong interactions.The binding constants of the reaction at 27 ℃,35 ℃ and 42 ℃ were 1.521×106 L·mol-1,7.048×105 L·mol-1 and 1.473×105 L·mol-1,respectively,and were decreased with increasing the temperature.The constants of maximum diffusion collision quenching rate-Kq were above 2.0×1010 L·mol-1·s-1.Therefore,the sort of quenching between meso-tetra-(4-hydroxyphenyl)-Zn porphyrin and bovine serum albumin was determined as static quenching.By the theory of Frster of non-radiation energy transfer,the binding distance and the energy transfer efficiency at 27 ℃ between meso-tetra-(4-hydroxyphenyl)-Zn porphyrin (accepter of energy) and bovine serum albumin (donor of energy) were obtained, respectively.The binding distance was 3.72 nm,which is less than 7 nm,therefore,the interaction was similar to the non-radiation energy transfer,and the static quenching was further proved.According to the thermodynamic parameters, the main sorts of binding force between meso-tetra-(4-hydroxyphenyl)-Zn porphyrin and bovine serum albumin could be judged as electrostatic force when ΔG<0,ΔH<0 and ΔS>0.
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ZHANG Li-na, CHEN Xin, XIA Yang, WU Dan, YU Jing-hua, DU Bin, WEI Qin. Study on Interaction Mechanism between Meso-Tetra-(4-Hydroxyphenyl)-Zn Porphyrin and Bovine Serum Albumin by Fluorescence Method[J]. Spectroscopy and Spectral Analysis, 2009, 29(3): 773
Received: May. 10, 2008
Accepted: --
Published Online: Dec. 15, 2009
The Author Email: Qin WEI (sdjndxwq@163.com)