Sm(Ⅲ)-HP配合物与DNA的作用机制  

Functionary Mechanism between Sm(Ⅲ) HP Complex and DNA

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作  者:赵娜[1] 王兴明[1] 黎泓波[2] 胡亚敏[1] 费丹[1] 丁立生[3] 

机构地区:[1]西南科技大学材料科学与工程学院化学系,四川绵阳621010 [2]湖南大学化学化工学院,湖南长沙410082 [3]中国科学院成都生物研究所,四川成都610041

出  处:《中山大学学报(自然科学版)》2009年第4期61-65,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基  金:国家自然科学基金资助项目(30572254)

摘  要:应用紫外-可见光谱法和荧光光谱法并以中性红(NR)作光谱探针研究了Sm(Ⅲ)HP配合物与DNA的作用机制。研究表明,血卟啉(HP)与Sm(Ⅲ)的配合比nSm(Ⅲ)∶nHP=1∶1,Sm(Ⅲ)HP配合物与DNA的结合比nSm(Ⅲ)HP∶nDNA=1∶1,Sm(Ⅲ)HP配合物与DNA的结合常数K3θ0℃=1.67×104L/mol。该过程为熵所驱动,其ΔrHm为4.86×104J/mol,ΔrSm为195.61 J/(mol.K),30℃时ΔrGm为-1.06×104J/mol。Scatchard法和探针法研究表明,Sm(Ⅲ)HP与DNA之间的结合方式主要是沟区作用。Using neutral red (NR) as a probe, functionary mechanism between Sm ( Ⅲ ) HP and DNA was studied by UV-vis and fluorescence spectroscopy. The results indicated that the binding ratio of nsm(Ⅲ) : nHP is 1 : 1, nsm(Ⅲ)HP: nDNA =1 : 1, and the binding constant of Sm ( Ⅲ ) HP complex with Herring Sperm DNA was K30℃^θ = 1.67 × 10^4 L/mol. Thermodynamic parameters of enthalpy (△rHm^θ), entropy (△rSm^θ) , and Gibbs free energy (△rGm^θ) were calculated to be 4. 86 × 104 J/mol, 195.61 J/ ( mol · K) and - 1.06 × 104 J/mol, respectively. The results suggested that the process of interaction of Sm ( Ⅲ ) HP complex and Herring Sperm DNA was driven by entropy. The results of scatchard and probe methods suggested that the primary interaction mode between Sm ( Ⅲ ) HP and DNA was groove binding.

关 键 词:Sm(Ⅲ)HP配合物 DNA 中性红 作用方式 

分 类 号:O614.337[理学—无机化学]

 

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