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Updated: Apr 1, 2026
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Published on: November 10, 2021
Controlled ionic-induced self-assembly of phycocyanin: Structure, binding mechanism, and molecular dynamics
Yangjing Li1, Zhicong Wang1, Hanxiong Liu1
1SKL of Marine Food Processing & Safety Control, National Engineering Research Center of Seafood, Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, Liaoning 116034, China; School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China.
This study enhances phycocyanin (PC) stability by incorporating copper ions (Cu2+), creating stable PC assemblies. This novel approach improves structural integrity for diverse applications.
Area of Science:
- Biochemistry
- Materials Science
Background:
- Phycocyanin (PC) is a valuable phycobiliprotein with significant nutritional and bioactive properties.
- Enhancing the structural stability of PC is crucial for its application in various industries.
Purpose of the Study:
- To develop a novel method for enhancing phycocyanin structural stability using metal ion incorporation.
- To investigate the effect of copper ions (Cu2+) on phycocyanin assembly and stability.
Main Methods:
- Copper ions (Cu2+) were introduced to phycocyanin at varying metal-to-protein ratios (50:1 to 300:1).
- Circular Dichroism (CD) spectroscopy was used to analyze changes in secondary structure.
- Isothermal Titration Calorimetry (ITC) was employed to study the interaction between Cu2+ and PC.
Main Results:
- Regular phycocyanin assemblies were formed, with Cu150@PC exhibiting enhanced structural order.
- CD analysis showed a 9% increase in α-helix and a 15% reduction in β-sheet content, indicating improved secondary structure stability.
- ITC confirmed strong interactions between Cu2+ and PC, with Cu2+ binding inducing conformational changes that promote assembly.
Conclusions:
- Copper ion incorporation effectively enhances the structural stability and assembly of phycocyanin.
- The findings provide a foundation for developing stable phycocyanin-based products for biotechnology, pharmaceuticals, and the food industry.
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