Extracting Charge and Mass Information from Highly Congested Mass Spectra Using Fourier-Domain Harmonics |
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Authors: | Sean P Cleary Huilin Li Dhanashri Bagal Joseph A Loo Iain D G Campuzano James S Prell |
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Institution: | 1.Department of Chemistry and Biochemistry,1253 University of Oregon,Eugene,USA;2.Department of Chemistry and Biochemistry, Department of Biological Chemistry, University of California,UCLA/DOE Institute for Genomics and Proteomics,Los Angeles,USA;3.Amgen Discovery Research,Amgen, Inc.,South San Francisco,USA;4.Molecular Structure and Characterization,Amgen, Inc.,Thousand Oaks,USA;5.Materials Science Institute,1252 University of Oregon,Eugene,USA |
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Abstract: | Native mass spectra of large, polydisperse biomolecules with repeated subunits, such as lipoprotein Nanodiscs, can often be challenging to analyze by conventional methods. The presence of tens of closely spaced, overlapping peaks in these mass spectra can make charge state, total mass, or subunit mass determinations difficult to measure by traditional methods. Recently, we introduced a Fourier Transform-based algorithm that can be used to deconvolve highly congested mass spectra for polydisperse ion populations with repeated subunits and facilitate identification of the charge states, subunit mass, charge-state-specific, and total mass distributions present in the ion population. Here, we extend this method by investigating the advantages of using overtone peaks in the Fourier spectrum, particularly for mass spectra with low signal-to-noise and poor resolution. This method is illustrated for lipoprotein Nanodisc mass spectra acquired on three common platforms, including the first reported native mass spectrum of empty “large” Nanodiscs assembled with MSP1E3D1 and over 300 noncovalently associated lipids. It is shown that overtone peaks contain nearly identical stoichiometry and charge state information to fundamental peaks but can be significantly better resolved, resulting in more reliable reconstruction of charge-state-specific mass spectra and peak width characterization. We further demonstrate how these parameters can be used to improve results from Bayesian spectral fitting algorithms, such as UniDec. |
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