Recently, the CPS biosynthetic loci for several strains ofCampylobacter jejuni were sequenced and revealed evidence for multiple mechanisms of structural variation. In this study, the CPS structure for the HS:1 serostrain of C. jejuni was determined using mass spectrometry and NMR at 600 MHz equipped with an ultra-sensitive cryogenically cooled probe. Ana-lysis of CPS purified using a mild enzymatic method revealed a teichoic acid-like [-4)-a-d-Galp-(1–2)-(R)-Gro-(1-P]n, repeating unit, where Gro is glycerol
