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- W2029681303 abstract "Electrospray ionization mass spectrometry (ESI-MS) has proven to be an extremely powerful tool for studying biomolecular structures and noncovalent interactions. Here we report a method using a fully automated, chip-based nanoESI-MS system to determine the dissociation constants (Kd) for the complexes of two different proteins with their ligands. The automated nanoelectrospray system, consisting of the NanoMate and ESI chip, serves functionally as a combination of autosampler and nanoelectrospray ionization source. This system provides all the advantages of conventional nanoelectrospray plus automated, high-throughput analyses without carryover. The automated nanoESI system was used to investigate quantitative noncovalent interactions between ribonuclease A (RNase A) and cytidylic acid ligands (2‘-CMP, CTP), a well-characterized model protein−ligand complex, and between an inactive endocellulase mutant (Thermobifida fusca Cel6A D117Acd) and four oligosaccharide ligands (cellotriose, cellotetraose, cellopentaose, cellohexaose). Both titration and competitive binding approaches were performed prior to automated nanoESI-MS analysis with a Q-TOF mass spectrometer. Dissociation constants for each complex were calculated from the sum of ion peak areas of free and complexed proteins during the titration and competition experiments. The measured Kd values for the RNase A−CMP and Cel6A D117Acd−G3 complexes were found to be in excellent agreement with the available published values obtained by standard spectroscopic titration techniques. To our knowledge, this is the first report of using an ESI-MS approach to study the interactions between a cellulase and oligosaccharides. The results provide new insights for understanding the nature of cellulase−cellulose interactions." @default.
- W2029681303 created "2016-06-24" @default.
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- W2029681303 date "2003-06-03" @default.
- W2029681303 modified "2023-10-17" @default.
- W2029681303 title "Quantitative Determination of Noncovalent Binding Interactions Using Automated Nanoelectrospray Mass Spectrometry" @default.
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- W2029681303 doi "https://doi.org/10.1021/ac034089d" @default.
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