Neisseria gonorrhoeae type IV pili undergo multisite, hierarchical modifications with phosphoethanolamine and phosphocholine requiring an enzyme structurally related to lipopolysaccharide phosphoethanolamine transferases - Aas, FE; Egge-Jacobsen, W; Winther-Larsen, HC; Lovold, C; Hitchen, PG; Dell, A; Koomey, M (JOURNAL OF BIOLOGICAL CHEMISTRY, 2006)