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Carbonara, Katrina; Padula, Matthew P.; Coorssen, Jens R.
Electrophoresis, February 2023, 2023-Feb, 2023-02-00, 20230201, Letnik: 44, Številka: 3-4Journal Article
The goal of integrative top–down proteomics (i.e., two‐dimensional gel electrophoresis 2DE coupled with liquid chromatography and tandem mass spectrometry LC/MS/MS) is a routine analytical approach that fully addresses the breadth and depth of proteomes. To accomplish this, there should be no addition, removal, or modification to any constituent proteoforms. To address two‐decade old claims of protein losses during front–end proteome resolution using 2DE, here we tested an alternate rehydration method for immobilized pH gradient strips prior to isoelectric focusing (IEF; i.e., faceup compared to facedown) and quantitatively assessed losses during the front–end of 2DE (rehydration and IEF). Using a well‐established high‐resolution, quantitative 2DE protocol, there were no detectable proteoform losses using the alternate faceup rehydration method. Although there is a <0.25% total loss of proteoforms during standard facedown rehydration, it is insignificant in terms of having any effect on overall proteome resolution (i.e., total spot count and total spot signal). This report is another milestone in integrative top–down proteomics, disproving long‐held dogma in the field and confirming that quantitative front–end 2DE/LC/MS/MS is currently the only method to broadly and deeply analyze proteomes by resolving their constituent proteoforms.
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