Skip to main content
. 2018 Nov 16;9:2725. doi: 10.3389/fmicb.2018.02725

FIGURE 2.

FIGURE 2

Analysis of cytosolic extracts from wild type, ΔmupG and ΔmupGmurQ cells by LC-MS. S. aureus JE2 wild type (wt) and mutant strains were grown in LB medium for 24 h. Macromolecules were removed from the cytosolic fractions by acetone precipitation and soluble extracts were analyzed by LC-MS in negative ion-mode. Representative mass spectra from at least three independent experiments are presented as base peak chromatograms (BPC) (×105 counts per s [cps]) in black and as differential spectra (DS, BPCmutant – BPCwt) (×105 [cps]) in red. DS of both mutants revealed the intracellular accumulation of a compound (absent in the wt cells) with an observed mass of (M-H)- = 575.151 m/z in ΔmupG cells and an observed mass of (M-H)- = 575.148 m/z) in ΔmupGmurQ cells.