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[Study on the direct interaction between alkaline phophatase and Cu(II) ions by spectral analysis]
1Department of Bioengineering, Dalian University of Technology, 116012 Dalian.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|August 30, 2003
Summary
Alkaline phosphatase (AKP) interacts with copper (II) ions, which enter the active site, reducing enzyme activity. Copper ion migration within the active site was observed with increasing pH.
Area of Science:
- Biochemistry
- Enzymology
- Bioinorganic Chemistry
Context:
- Alkaline phosphatase (AKP) is a crucial enzyme involved in various biological processes.
- Understanding the interaction of metal ions with enzymes is vital for elucidating their catalytic mechanisms and regulatory pathways.
Purpose:
- To investigate the interaction between calf intestinal alkaline phosphatase (AKP) and copper (II) ions (Cu(II)).
- To determine the effect of Cu(II) on AKP activity and explore the localization of Cu(II) within the enzyme's active site.
Summary:
- Electron paramagnetic resonance (EPR), visible spectroscopy (VIS), and enzyme activity assays demonstrate direct interaction between calf intestinal alkaline phosphatase and Cu(II).
- Cu(II) ions bind to the A site of AKP's active site, leading to a decrease in enzyme activity.
- Changes in EPR signal intensity and VIS spectra with increasing pH suggest Cu(II) migration within the enzyme's active center.
Impact:
- Provides insights into the mechanism of enzyme inhibition by metal ions.
- Elucidates the dynamic behavior of metal ions within enzyme active sites.
- Contributes to the understanding of metalloenzyme structure-function relationships.