Further Evidence that a Cell Wall Precursor [C55-MurNAc-(Peptide)-GlcNAc] Serves as an Acceptor in a Sorting Reaction

ABSTRACT Previous studies suggested that a Gly-containing branch of cell wall precursor [C55-MurNAc-(peptide)-GlcNAc], which is often referred to as lipid II, might serve as a nucleophilic acceptor in sortase-catalyzed anchoring of surface proteins in Staphylococcus aureus. To test this hypothesis, we first simplified the procedure for in vitro biosynthesis of Gly-containing lipid II by using branched UDP-MurNAc-hexapeptide isolated from the cytoplasm of Streptomyces spp. Second, we designed a thin-layer chromatography-based assay in which the mobility of branched but not linear lipid II is shifted in the presence of both sortase and LPSTG-containing peptide. These results and those of additional experiments presented in this study further suggest that lipid II indeed serves as a natural substrate in a sorting reaction.

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