Brucella O-antigen
brucella o-antigen
A diblock copolymer in which one block consists of tetrasaccharide components comprising <em>N</em>-formyl-α-<small>D</small>-perosamine residues linked sequentially (1→2), (1→3) and (1→2) [α-<small>D</small>-Rha<em>p</em>4NFo-(1→2)-α-<small>D</small>-Rha<em>p</em>4NFo-(1→3)-α-<small>D</small>-Rha<em>p</em>4NFo-(1→2)-α-<small>D</small>-Rha<em>p</em>4NFo], with the second block consisting of <em>N</em>-formyl-α-<small>D</small>-perosamine residues linked solely (1→2). The percentage of (1→3) linkages compared with (1→2) ranges from 1% to 20% in different <em>Brucella</em> biovars.