Fig. 4
The N-acetylated and N-long-chain-acylated triacyl structures of staphylococcal Lpp. The N-acetylation (a) is detected in S. carnosus, while the N-long-chain acylation (b) is found in S. aureus, S. epidermidis, and S. carnosus (pCX-lnt). Representative structures of each type are shown. The long-chain acylation at the α-amino group of Lpp varies in length in S. aureus and S. epidermidis. In contrast, only heptadecanoyl group is detected in S. carnosus (pCX-lnt). The sn-1 and sn-2 positions are O-acylated with various lengths of fatty acids (15:0–21:0) and exclusively O-pentadecanoic acid (15:0) in all the staphylococcal Lpps examined in this study
