Related Experiment Videos
Aptamer affinity chromatography: combinatorial chemistry applied to protein purification
T S Romig1, C Bell, D W Drolet
1NeXstar Pharmaceuticals, Boulder, CO 80301, USA.
Summary
DNA aptamers, which bind targets with high specificity, were used to create an affinity column for purifying a human L-selectin fusion protein. This method achieved significant purification in a single step.
Area of Science:
- Biochemistry
- Molecular Biology
- Biotechnology
Background:
- Systematic evolution of ligands by exponential enrichment (SELEX) identifies high-affinity aptamers.
- Aptamers are short DNA or RNA sequences that bind specific molecular targets.
- Affinity chromatography is a key protein purification technique.
Purpose of the Study:
- To develop and evaluate a DNA aptamer-based affinity column for purifying recombinant human L-selectin-Ig fusion protein.
- To assess the efficiency and specificity of aptamer affinity chromatography in protein purification.
Main Methods:
- A DNA aptamer specific for human L-selectin was generated using SELEX.
- The aptamer was immobilized onto a chromatography support to create an affinity column.
- Recombinant human L-selectin-Ig fusion protein was purified from Chinese hamster ovary cell-conditioned medium using the aptamer column.
Main Results:
- The aptamer affinity column effectively bound and eluted the target fusion protein using gentle conditions.
- Employing the aptamer column as an initial purification step yielded a 1500-fold purification.
- A single-step recovery of 83% was achieved, demonstrating high efficiency.
Conclusions:
- Oligonucleotide aptamers are effective reagents for affinity-based protein purification.
- Aptamer affinity chromatography offers a powerful tool for purifying specific proteins, such as L-selectin fusion proteins.
- This method provides a highly efficient and specific approach to protein purification in biotechnology and research.