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An improved method to extract and purify cystatin from hen egg white
1Department of Agricultural, Food and Nutritional Science (AFNS), 4-10 Ag/For Building, University of Alberta, Edmonton, Alberta, Canada T6G 2P5.
Summary
This study presents an improved method for extracting and purifying hen egg white cystatin, a cysteine proteinase inhibitor. The new technique significantly enhances purity and yield, making cystatin more accessible for health applications.
Area of Science:
- Biochemistry
- Protein purification
- Enzyme inhibition
Background:
- Hen egg white cystatin is a cysteine proteinase inhibitor with potential health benefits.
- High extraction and preparation costs limit its widespread use.
- Developing cost-effective purification methods is crucial for broader applications.
Purpose of the Study:
- To develop an improved and cost-effective method for extracting and purifying cystatin from hen egg white.
- To enhance the purity and yield of cystatin compared to conventional methods.
- To characterize the purified cystatin and assess its inhibitory activity.
Main Methods:
- Ovomucin removal followed by cation exchange chromatography.
- Affinity chromatography using a cm-papain-Sepharose column for further purification.
- Characterization using SDS-PAGE, Western-Blot, LC-MS/MS, and purity determination by HPLC.
Main Results:
- Achieved a cystatin purity of 93.3 ± 4.0%, a significant improvement from 56.6 ± 1.7%.
- Increased cystatin yield from 21.3 ± 1.2% to 33.6 ± 1.5%.
- Purified cystatin exhibited high relative inhibitory activity against papain (88 ± 7%), indicating no significant loss of function.
Conclusions:
- The developed method offers a more efficient and effective way to purify hen egg white cystatin.
- The enhanced purity and yield facilitate broader utilization of cystatin in health-related applications.
- The purification process preserves the functional activity of cystatin.
