Trypsin shaving is a targeted proteomic method for identifying cell-surface exposed proteins on bacterial cells. For the identification of redox-active cell-surface proteins, trypsin-shaving datasets can be matched with surface-enhanced Raman spectra of intact cells to identify the cofactors associated with the cell-surface proteins. Together, these approaches could help resolve questions about the presence of cell-surface electron transport components in environmental microorganisms, especially microbes that oxidize and reduce metals and metalloids as electron donors and acceptors.
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