Figure 8. Key components for PG biogenesis in the elongasome and mature divisome of E. coli.
Lipid II is synthesized in the inner leaflet of the cytoplasmic or inner membrane (IM) and colocalizes with both the elongasome (left) and divisome (right) complexes. The exact molecular architecture of the elongasome and divisome, as well as how they insert new material into the pre-existing PG layer, remain unknown. LpoA and LpoB are lipoproteins that are anchored to the outer membrane (OM). For simplicity, PG hydrolases that are known to associate with each complex and to be important for their correct activity are not shown.