Figure 3. Iha is expressed under iron-limiting conditions.
Iha expression was examined in outer membrane preparations of overnight cultures grown in iron-replete or iron-limiting conditions. 2 μg total outer membranes were separated by SDS-PAGE and transferred to nitrocellulose for immunoblot analysis (left) or stained with Coomassie blue (right).
(A): Addition of 10 μM FeSO4.7H2O to DMEM abolishes Iha expression in the outer membrane.
(B): Addition of the iron chelator 2,2′dipyridyl to LB results in expression of Iha in the outer membrane.