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. 2019 Jan 9;9:3301. doi: 10.3389/fmicb.2018.03301

FIGURE 1.

FIGURE 1

Schematic representation of capsule polysaccharide assembly and export in A. baumannii. Synthesis begins with the initial transferase (Itr; maroon) located in the inner membrane (IM) transferring the first sugar of the repeating unit to a lipid carrier (Und-P; green circle). Subsequent sugars are then added to the growing unit by specific glycosyltransferases (Gtr; yellow) on the cytosolic side of the inner membrane. The capsule subunit (K unit) is then transferred to the periplasm via the integral membrane protein Wzx (dark blue). The sugar subunits are polymerized by the Wzy protein (purple) and the Wza/Wzb/Wzc complex (cyan, lime, red) coordinates high level polymerization and export of the growing chain, moving them to the outer membrane (OM). For glycosylation, PglL (orange) links the K units onto selected outer membrane proteins (OMP; dark green).