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- W2902307150 abstract "We report a novel method named LITPOMS (ligand titration, fast photochemical oxidation of proteins and mass spectrometry) to characterize protein-ligand binding stoichiometry, binding sites, and site-specific binding constants. The system used to test the method is melittin–calmodulin, in which the peptide melittin binds to calcium-bound calmodulin. Global-level measurements reveal the binding stoichiometry of 1:1 whereas peptide-level data coupled with fitting reveal the binding sites and the site-specific binding affinity. Moreover, we extended the analysis to the residue level and identified six critical binding residues. The results show that melittin binds to the N-terminal, central linker, and C-terminal regions of holo-calmodulin with an affinity of 4.6 nM, in agreement with results of previous studies. LITPOMS, for the first time, brings high residue-level resolution to affinity measurements, providing simultaneously qualitative and quantitative understanding of protein-ligand binding. The approach can be expanded to other binding systems without tagging the protein to give high spatial resolution." @default.
- W2902307150 created "2018-12-11" @default.
- W2902307150 creator A5031479644 @default.
- W2902307150 creator A5054440913 @default.
- W2902307150 creator A5056480326 @default.
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- W2902307150 date "2018-11-27" @default.
- W2902307150 modified "2023-10-06" @default.
- W2902307150 title "Protein-Ligand Interaction by Ligand Titration, Fast Photochemical Oxidation of Proteins and Mass Spectrometry: LITPOMS" @default.
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- W2902307150 doi "https://doi.org/10.1007/s13361-018-2076-x" @default.
- W2902307150 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6438201" @default.
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