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Skip to Search Results- 20Electrospray ionization mass spectrometry
- 12Affinity
- 11Complexes
- 10Carbohydrates
- 7Affinities
- 6Binding
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2011
El-Hawiet, Amr, Klassen, John S., Armstrong, Glen D., Dingle, Tanis C., Eugenio, Luiz, Mulvey, George L., Szpacenko, Adam, Ng, Kenneth K.S., Kitova,Elena N., Kitov, Pavel
The binding of recombinant fragments of the C-terminal cell-binding domains of the two large exotoxins, toxin A (TcdA) and toxin B (TcdB), expressed by Clostridium difficile and a library consisting of the most abundant neutral and acidic human milk oligosaccharides (HMOs) was examined...
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Screening anti-cancer drugs against tubulin using catch-and-release electrospray ionization mass spectrometry
Download2016
Kitova, Elena N., Klassen, John S., Winter, Philip, Tuszynski, Jack A., Darestani, Reza R.
Tubulin, which is the building block of microtubules, plays an important role in cell division. This critical role makes tubulin an attractive target for the development of chemotherapeutic drugs to treat cancer. Currently, there is no general binding assay for tubulin–drug interactions. The...
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2016
Klassen, John S., Yao, Yuyu, Kitova, Elena N., Richards, Michele R.
The results of an investigation into the influence of sulfolane, a commonly used supercharging agent, on electrospray ionization mass spectrometry (ESI-MS) measurements of protein–ligand affinities are described. Binding measurements carried out on four protein–carbohydrate complexes, lysozyme...
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Identifying nonspecific ligand binding in electrospray ionization mass spectrometry using the reporter molecule method
Download2009
Kitova, Elena N., Sun, Jiangxiao, Sun, Nian, Klassen, John S.
The application of the reporter molecule (Mrep) method for identifying nonspecific complexes in the ES-MS analysis of protein-ligand and DNA-ligand interactions in vitro is described. To test the reliability of the method, it was applied to the ES-MS analysis of protein-carbohydrate complexes...
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2015
El-Hawiet, Amr, N. Kitova, Elena N., Klassen, John S.
The affinities of the most abundant oligosaccharides found in human milk for four bacterial exotoxins (from Vibrio cholerae and pathogenic Escherichia coli) were quantified for the first time. Association constants (Ka) for a library of 20 human milk oligosaccharides (HMOs) binding to Shiga toxin...
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2012
Klassen, John S., Lin, Hong, Kitova, Elena N., Ng, Kenneth K., Johnson, M. A., Eugenio, Luiz
Electrospray ionization mass spectrometry (ESI-MS) measurements were performed under a variety of solution conditions on a highly acidic sub-fragment (B3C) of the C-terminal carbohydrate-binding repeat region of Clostridium difficile toxin B, and two mutants (B4A and B4B) containing fewer acidic...
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Quantifying protein-carbohydrate interactions using liquid sample desorption electrospray ionization mass spectrometry
Download2015
N. Kitova, Elena N., Shams-Ud-Doha, Km, Yao, Yuyu, Klassen, John S., Daneshfar, Rambod
The application of liquid sample desorption electrospray ionization mass spectrometry (liquid sample DESI-MS) for quantifying protein–carbohydrate interactions in vitro is described. Association constants for the interactions between lysozyme and β-D-GlcNAc-(1 → 4)-β-D-GlcNAc-(1 → 4)-D-GlcNAc and...
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Protein-glycolipid interactions studied in vitro using ESI-MS and nanodiscs: Insights into the mechanisms and energetics of binding
Download2015
Nikjah, Sanaz, Boraston, Alisdair B., Lin, Hong, Kitova, Elena N., Li, Jun, Pluvinage, Benjamin, Han, Ling Han, Klassen, John S.
Electrospray ionization-mass spectrometry (ESI-MS) analysis combined with the use of nanodiscs (NDs) to solubilize glycolipids (GLs) has recently emerged as a promising analytical method for detecting protein–GL interactions in vitro and, when applied to libraries of GLs, ranking their...
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Dissociation kinetics of the streptavidin-biotin interaction measured using direct electrospray ionization mass spectrometry analysis
Download2013
Deng, Lu, Klassen, John S., Kitova, Elena N.
Dissociation rate constants (koff) for the model high affinity interaction between biotin (B) and the homotetramer of natural core streptavidin (S4) were measured at pH 7 and temperatures ranging from 15 to 45 °C using electrospray ionization mass spectrometry (ESI-MS). Two different approaches...
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Structure and stability of carbohydrate-lipid interactions: Methylmannose polysaccharide-fatty acid complexes
Download2016
Mayer, Paul M., Richards, Michele R., Lowary, Todd L., Renaud, Justin, Klassen, John S., Tieleman, D. Peter, Kitova, Elena N., Liu, Lan, Siuda, Iwona
We report a detailed study of the structure and stability of carbohydrate–lipid interactions. Complexes of a methylmannose polysaccharide (MMP) derivative and fatty acids (FAs) served as model systems. The dependence of solution affinities and gas-phase dissociation activation energies (Ea) on FA...