Figure 6. Section of the charge deconvoluted ESI-FT-ICR-MS spectra (acquired in negative ion mode) of S. oralis Uo5∆cps LTA.

Repeating units (RUs) were detected with an average mass of 1299.4 Da. The RU size was determined on LTA molecules comprising a fatty acid composition with 32 carbon atoms and full saturation. The isolated LTA fraction comprised a complex mixture of molecular species as depicted in Fig. S8 and assigned molecules are summarized in Table S4.