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• W4386084114 abstract "Membrane proteins are often challenging targets for native top-down mass spectrometry experimentation. The requisite use of membrane mimetics to solubilize such proteins necessitates the application of supplementary activation methods to liberate protein ions prior to sequencing, which typically limits the sequence coverage achieved. Recently, infrared photoactivation has emerged as an alternative to collisional activation for the liberation of membrane proteins from surfactant micelles. However, much remains unknown regarding the mechanism by which IR activation liberates membrane protein ions from such micelles, the extent to which such methods can improve membrane protein sequence coverage, and the degree to which such approaches can be extended to support native proteomics. Here, we describe experiments designed to evaluate and probe infrared photoactivation for membrane protein sequencing, proteoform identification, and native proteomics applications. Our data reveal that infrared photoactivation can dissociate micelles composed of a variety of detergent classes, without the need for a strong IR chromophore by leveraging the relatively weak association energies of such detergent clusters in the gas phase. Additionally, our data illustrate how IR photoactivation can be extended to include membrane mimetics beyond micelles and liberate proteins from nanodiscs, liposomes, and bicelles. Finally, our data quantify the improvements in membrane protein sequence coverage produced through the use of IR photoactivation, which typically leads to membrane protein sequence coverage values ranging from 40 to 60%." @default.
• W4386084114 created "2023-08-24" @default.
• W4386084114 creator A5060482567 @default.
• W4386084114 creator A5082782774 @default.
• W4386084114 creator A5092810166 @default.
• W4386084114 date "2023-08-23" @default.
• W4386084114 modified "2023-09-26" @default.
• W4386084114 title "Infrared Photoactivation Enables Improved Native Top-Down Mass Spectrometry of Transmembrane Proteins" @default.
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• W4386084114 doi "https://doi.org/10.1021/acs.analchem.3c02788" @default.
• W4386084114 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37610409" @default.
• W4386084114 hasPublicationYear "2023" @default.
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