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Published on: June 6, 2018
Biophysical analysis of interaction between curcumin and alpha-2-macroglobulin
Syed Saqib Ali1, Mohammad Khalid Zia1, Tooba Siddiqui1
1Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India.
Curcumin binding to alpha-2-macroglobulin (α2M) alters protein structure and reduces its antiproteinase activity. This interaction is spontaneous and exothermic, impacting the protein's overall function.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Alpha-2-macroglobulin (α2M) is a large glycoprotein and a broad-spectrum antiproteinase.
- Curcumin, derived from turmeric, possesses antioxidant, anti-tumor, and anti-inflammatory properties.
Purpose of the Study:
- To investigate the interaction between curcumin and α2M.
- To elucidate the structural and functional consequences of this interaction.
Main Methods:
- Antiproteinase activity assay
- Circular Dichroism (CD) and FT-IR spectroscopy
- Isothermal Titration Calorimetry (ITC)
Main Results:
- Curcumin binding induces conformational changes in α2M, specifically altering β-sheet content.
- The interaction is exothermic and spontaneous, with thermodynamic parameters analyzed by ITC.
- Curcumin binding compromises the antiproteinase activity of α2M.
Conclusions:
- Curcumin binding leads to a loss of antiproteinase potential in α2M.
- The study reveals a novel interaction mechanism between a natural compound and a key protease inhibitor.
- Findings suggest potential therapeutic implications for curcumin in conditions involving α2M activity.
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