Fig. 1.

General arrangement of the surface polysaccharide synthesis loci in A. baumannii . KL and OCL boundaries are shown and flanking locus genes are coloured grey. Variable sequence portions are indicated by white boxes, and conserved genes at each locus are represented by coloured arrows. (a) Organization of the KL with marked regions defining the roles of common modules. CPS export genes are in orange, and genes in dark blue are involved in the synthesis of common sugar substrates. gne1 is not always present but is often critical to the synthesis of many CPS structures. (b) Organization of the two groups (A and B) of the OC locus with marked regions defining conserved or variable portions. Genes in green encode conserved glycosyltransferases and genes in light blue are those involved in complex sugar synthesis.