Analysis of the effect of replacements in the ED(Y)
motif of WbbE on O:54 LPS expression. Immunoblot of anti-O:54 reactive
LPS from E. coli DH5α harboring wild-type or mutated WbbE
and wild-type WbbF. Lanes: 1, pET30a(+) (negative control); 2,
pWQ835; 3, pWQ835-180; 4, pWQ835-180, pWQ818; 5, pWQ835-180Q; 6,
pWQ835-180Q, pWQ818; 7, pWQ835-181; 8, pWQ835-181A; 9,
pWQ835-181A, pWQ818. R-LPS was not detected due to the use of
antisera adsorbed against E. coli DH5α. The migration of
S-LPS is indicated.