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Aptamer-enhanced laser desorption/ionization for affinity mass spectrometry.
Lawrence W Dick1, Linda B McGown
1Department of Chemistry, Duke University, Box 90346, Durham, North Carolina 27708, USA.
Analytical Chemistry
|May 29, 2004
Summary
This study presents a novel method for capturing thrombin using DNA aptamers on a MALDI surface. This technique allows for selective protein isolation and detection, with reusable aptamer surfaces for enhanced analysis.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Biotechnology
Background:
- Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) is a powerful analytical technique.
- Selective isolation of target proteins from complex biological samples remains a challenge.
Purpose of the Study:
- To develop a method for the affinity capture and isolation of thrombin using DNA aptamers for MALDI-TOF-MS analysis.
- To demonstrate the selective capture of thrombin from biological mixtures and the reusability of the aptamer-modified surface.
Main Methods:
- Covalent attachment of thrombin-binding DNA aptamers to a glass slide serving as the MALDI surface.
- Utilizing aptamer unfolding induced by a low-pH MALDI matrix for thrombin release.
- Washing steps to remove non-specific proteins and matrix/protein residues for surface reusability.
Main Results:
- Thrombin was selectively retained on the aptamer-modified surface, while albumin was removed.
- Successful selective capture of thrombin from mixtures with albumin and from human plasma (with prothrombin).
- Demonstrated reusability of the aptamer-modified surface after protein release and aptamer refolding.
Conclusions:
- The developed aptamer-based affinity capture method enables selective isolation and detection of thrombin.
- This approach offers a simple, reusable platform for protein analysis, sensing, purification, and preconcentration in biological fluids.