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- 12Affinity
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Mapping protein-ligand interactions in the gas phase using a functional group replacement strategy: Comparison of CID and BIRD activation methods
Download2013
Klassen, John S., Kitova, Elena N., Deng, Lu
Intermolecular interactions in the gaseous ions of two protein–ligand complexes, a single chain antibody (scFv) and its trisaccharide ligand (α-D-Galp-(1→2)-[α-D-Abep-(1→3)]-α-Manp-OCH3, L1) and streptavidin homotetramer (S4) and biotin (B), were investigated using a collision-induced...
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Nonspecific interactions between proteins and charged biomolecules in electrospray ionization mass spectrometry
Download2010
Kitova, Elena N., Sun, Nian, Klassen, John S., Soya, Naoto
An investigation of the nonspecific association of small charged biomolecules and proteins in electrospray ionization mass spectrometry (ES-MS) is described. Aqueous solutions containing pairs of proteins and a small acidic or basic biomolecule that does not interact specifically with either of...
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Quantifying labile protein-ligand interactions using electrospray ionization mass spectrometry
Download2010
El-Hawiet, Amr, Klassen, John S., Kitova, Elena N., Liu, Lan
A new electrospray ionization mass spectrometry (ES-MS) approach for quantifying protein—ligand complexes that are prone to in-source (gas-phase) dissociation is described. The method, referred to here as the reference ligand ES-MS method, is based on the direct ES-MS assay and competitive ligand...
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2011
Dingle, Tanis C., Szpacenko, Adam, Ng, Kenneth K.S., Kitov, Pavel, Klassen, John S., El-Hawiet, Amr, Kitova,Elena N., Mulvey, George L., Eugenio, Luiz, Armstrong, Glen D.
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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Quantifying protein-fatty acid interactions using electrospray ionization mass spectrometry
Download2011
Liu, Lan, Kitova, Elena N., Klassen, John S.
The application of the direct electrospray ionization mass spectrometry (ESI-MS) assay to quantify interactions between bovine β-lactoglobulin (Lg) and a series of fatty acids (FA), CH3(CH2)xCOOH, where x = 6 (caprylic acid, CpA), 8 (capric acid, CA), 10 (lauric acid, LA), 12 (myristic acid, MA),...
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Thermal dissociation of streptavidin homotetramer in the gas phase: Subunit loss versus backbone fragmentation
Download2013
Deng, Lu, Klassen, John S., Kitova, Elena N., Sinelnikov, Igor
The results of time-resolved blackbody infrared radiative dissociation experiments performed on gaseous protonated ions, at charge states +15, +16 and +17, of the homotetramer streptavidin (S4) are reported. Evidence is found for three dissociation pathways involving (i) the loss of a single...
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2014
Kitova, Elena N., Klassen, John S., Michelsen, Klaus, Liu, Lan, Schnier, Paul D., Baergen, Alyson
This work explores the energetics of intermolecular H-bonds inside a hydrophobic protein cavity. Kinetic measurements were performed on the gaseous deprotonated ions (at the −7 charge state) of complexes of bovine β-lactoglobulin (Lg) and three monohydroxylated analogs of palmitic acid (PA):...
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Measuring positive cooperativity using the direct ESI-MS assay: Cholera toxin B subunit homopentamer binding to GM1 pentasaccharide
Download2014
Lin, Hong, Klassen, John S., Kitova, Elena N.
Direct electrospray ionization mass spectrometry (ESI-MS) assay was used to investigate the stepwise binding of the GM1 pentasaccharide β-D-Galp-(1→3)-β-D-GalpNAc-(1→4)[α-D-Neu5Ac-(2→3)]-β-D-Galp-(1→4)-β-D-Glcp (GM1os) to the cholera toxin B subunit homopentamer (CTB5) and to establish...
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Localizing carbohydrate binding sites in proteins using hydrogen/deuterium exchange mass spectrometry
Download2016
Kitova, Elena N., Klassen, John S., Eugenio, Luiz, Li, Jun, Ng, Kenneth, Zhang, Jingjing
The application of hydrogen/deuterium exchange mass spectrometry (HDX-MS) to localize ligand binding sites in carbohydrate-binding proteins is described. Proteins from three bacterial toxins, the B subunit homopentamers of Cholera toxin and Shiga toxin type 1 and a fragment of Clostridium...
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2015
Klassen, John S., Yao, Yuyu, Serpe, Michael J., Xu, Wenwen
Anisotropic particles have generated an enormous amount of research interest due to their applications for drug delivery, electronic displays and as micromotors. However, up till now, there is no single protocol capable of generating particles of “patchy” composition with a variety of...