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- W2785017462 abstract "Peptidoglycan (PG) is a major component of the cell wall in Enterococcus faecalis. Accurate analysis of PG composition provides crucial insights into the bacterium’s cellular functions and responses to external stimuli, but this analysis remains challenging because of various chemical modifications to PG-repeat subunits. We characterized changes to the PG composition of E. faecalis grown as planktonic bacteria and biofilm by developing “stable isotope labeling by amino acids in bacterial culture” (SILAB), optimized for bacterial cultures with incomplete amino acid labeling. This comparative analysis by mass spectrometry was performed by labeling E. faecalis in biofilm with heavy Lys (l-[13C6,2D9,15N2]Lys) and planktonic bacteria with natural abundance l-Lys, then mixing equal amounts of bacteria from each condition, and performing cell wall isolation and mutanolysin digestion necessary for liquid chromatography and mass spectrometry. An analytical method was developed to determine muropeptide abundances using correction factors to compensate for incomplete heavy Lys isotopic enrichment (98.33 ± 0.05%) and incorporation (83.23 ± 1.16%). Forty-seven pairs of PG fragment ions from isolated cell walls of planktonic and biofilm samples were selected for SILAB analysis. We found that the PG in biofilm showed an increased level of PG cross-linking, an increased level of N-deacetylation of GlcNAc, a decreased level of O-acetylation of MurNAc, and an increased number of stem modifications by d,d- and l,d-carboxypeptidases." @default.
- W2785017462 created "2018-02-02" @default.
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- W2785017462 date "2018-02-02" @default.
- W2785017462 modified "2023-10-14" @default.
- W2785017462 title "Peptidoglycan Compositional Analysis of <i>Enterococcus faecalis</i> Biofilm by Stable Isotope Labeling by Amino Acids in a Bacterial Culture" @default.
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- W2785017462 doi "https://doi.org/10.1021/acs.biochem.7b01207" @default.
- W2785017462 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5972391" @default.
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