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碱性磷酸酶与Cu(Ⅱ)相互作用的谱学研究
Study on the Direct Interaction between Alkaline Phophatase and Cu(Ⅱ) Ions by Spectral Analysis
【摘要】 本文通过顺磁共振法、可见光谱法及酶活性测量研究从小牛肠粘膜提纯的碱性磷酸酶 (AKP)在pH5 8条件下与外加的Cu(Ⅱ )离子直接相互作用。结果发现 :外加Cu(Ⅱ )离子进入AKP活性中心位点 ,取代了活性中心位点的Zn(Ⅱ ) ,使酶活性下降。随着pH值的升高 ,Cu(Ⅱ )在活性位点间发生迁移 ,形成同一亚基上两个铜的抗铁磁性偶合 ,导致EPR垂直分量信号强度下降和可见光谱最大吸收峰位置的变化。
【Abstract】 In this paper,the results of EPR,VIS and enzyme activity show that alkaline phophatase from calf intest directly interacted with additional Cu(Ⅱ).The added Cu(Ⅱ) enter into A site of active sites of AKP which decrease enzyme activity.With increase of pH value,the decrease in the intensity of the Cu(Ⅱ) EPR signal and the change of place signal in VIS were observed.These results suggest that Cu(Ⅱ) migrate in the active center of the enzyme.
【关键词】 EPR谱;
碱性磷酸酶;
Cu(Ⅱ);
相互作用;
【Key words】 EPR spectroscopy; Alkaline phosphatase; Cu(Ⅱ) ions; Interaction;
【Key words】 EPR spectroscopy; Alkaline phosphatase; Cu(Ⅱ) ions; Interaction;
- 【文献出处】 光谱学与光谱分析 ,Spectroscopy and Spectral Analysis , 编辑部邮箱 ,2001年04期
- 【分类号】O621
- 【被引频次】3
- 【下载频次】99