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Selection of ligands for affinity chromatography using quartz crystal biosensor
Yang Liu1, Xiaoling Tang, Feng Liu
1Key Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
Analytical Chemistry
|July 1, 2005
Summary
This study introduces a novel quartz crystal microbalance (QCM) biosensor strategy for rapidly selecting affinity ligands. Kanamycin (KM) was identified as a specific ligand for lysozyme (LZM) purification, achieving over 90% purity.
Area of Science:
- Biochemistry
- Biosensor Technology
- Affinity Chromatography
Background:
- Affinity chromatography is crucial for protein purification.
- Developing specific and efficient affinity ligands is a key challenge.
- Rapid screening methods are needed to accelerate ligand discovery.
Purpose of the Study:
- To develop a new strategy for rapid ligand selection using a QCM biosensor.
- To identify and validate kanamycin (KM) as a novel affinity ligand for lysozyme (LZM) purification.
Main Methods:
- Immobilization of kanamycin (KM) onto a quartz crystal microbalance (QCM) biosensor.
- Monitoring binding interactions of KM with proteins using QCM frequency variations.
- Kinetic analysis of KM-lysozyme (LZM) interactions using genetic algorithm software.
Main Results:
- KM-immobilized QCM sensor showed specific binding to LZM.
- Kinetic analysis yielded dissociation constants (K(D)) in the range of 10(-5) M, indicating high affinity.
- KM-affinity chromatography successfully purified LZM from chicken egg white to >90% purity.
Conclusions:
- Kanamycin (KM) is a novel and effective affinity ligand for lysozyme (LZM) purification.
- The QCM biosensor strategy enables rapid and specific selection of affinity ligands.
- This approach holds promise for selecting ligands for other valuable protein purifications.