Title |
Screening Carbohydrate Libraries for Protein Interactions Using the Direct ESI-MS Assay. Applications to Libraries of Unknown Concentration
|
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Published in |
Journal of the American Society for Mass Spectrometry, August 2014
|
DOI | 10.1007/s13361-014-0964-2 |
Pubmed ID | |
Authors |
Elena N. Kitova, Amr El-Hawiet, John S. Klassen |
Abstract |
A semiquantitative electrospray ionization mass spectrometry (ESI-MS) binding assay suitable for analyzing mixtures of oligosaccharides, at unknown concentrations, for interactions with target proteins is described. The assay relies on the differences in the ratio of the relative abundances of the ligand-bound and free protein ions measured by ESI-MS at two or more initial protein concentrations to distinguish low affinity (≤10(3) M(-1)) ligands from moderate and high affinity (>10(5) M(-1)) ligands present in the library and to rank their affinities. Control experiments were performed on solutions of a single chain antibody and a mixture of synthetic oligosaccharides, with known affinities, in the absence and presence of a 40-component carbohydrate library to demonstrate the implementation and reliability of the assay. The application of the assay for screening natural libraries of carbohydrates against proteins is also demonstrated using mixtures of human milk oligosaccharides, isolated from breast milk, and fragments of a bacterial toxin and human galectin 3. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 19 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Ph. D. Student | 7 | 37% |
Researcher | 5 | 26% |
Student > Bachelor | 1 | 5% |
Student > Master | 1 | 5% |
Student > Doctoral Student | 1 | 5% |
Other | 0 | 0% |
Unknown | 4 | 21% |
Readers by discipline | Count | As % |
---|---|---|
Chemistry | 10 | 53% |
Biochemistry, Genetics and Molecular Biology | 2 | 11% |
Agricultural and Biological Sciences | 2 | 11% |
Immunology and Microbiology | 1 | 5% |
Unknown | 4 | 21% |