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- W2023951503 abstract "The nonspecific self-association of proteins in nanoflow electrospray ionization mass spectrometry (nanoES-MS), and the influence of experimental conditions thereon, are investigated using the protein ubiquitin (Ubq) as a model system. Extents of nonspecific protein association generally increase with protein concentration and, interestingly, with decreasing ES spray potential. The extent of self-association is also sensitive to the duration of the accumulation event in an external rf hexapole. Notably, the relative abundance of metal (Na+ and K+) adducts generally increases with the size of nonspecific Ubq multimer. This result suggests that the gaseous ions of monomeric and nonspecific multimeric Ubq have, on average, different ES droplet histories, with monomer ions originating earlier in the ES process than the nonspecific multimeric complexes. This finding forms the basis for a new method for distinguishing between specific and nonspecific protein complexes in ES-MS. A reporter molecule (Mrep), which does not bind specifically to the proteins and protein complexes of interest, is added to the ES solution at high concentration. The distribution of Mrep bound nonspecifically to gaseous ions of the proteins and protein complexes, as determined from the ES mass spectrum, is used to determine whether a given protein complex originates in solution or whether it forms from nonspecific binding during the ES process. The method is demonstrated in cases where the ions of protein complexes detected by nanoES-MS originate exclusively from nonspecific association, exclusively from specific interactions in solution, or from both specific and nonspecific interactions." @default.
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- W2023951503 date "2007-10-05" @default.
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- W2023951503 title "Method for Identifying Nonspecific Protein−Protein Interactions in Nanoelectrospray Ionization Mass Spectrometry" @default.
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- W2023951503 doi "https://doi.org/10.1021/ac0709347" @default.
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