A. InvE expression in Δp invE:: p araBAD strain MS5512. ΔpinvE:: paraBAD strain MS5512 and wild-type strain MS390 were grown overnight in LB medium containing chloramphenicol and 50 μM arabinose, washed twice with fresh LB medium, and then inoculated into YENB media containing increasing concentrations of arabinose and cultured at 37°C with or without 150 mM NaCl, as indicated. Strains (ΔpinvE::paraBAD, MS5512; Wt, wild-type strain MS390), concentration of NaCl (0 mM or 150 mM) and concentration of arabinose (0, 0.2, 0.5, 1.0 mM) are indicated above the panels. Primers and antibodies used in the experiments are indicated on the right side of the panels. B. Stability of InvE protein. ΔinvE strain MS1632 carrying the expression plasmid pBAD-invE was grown in YENB media containing ampicillin and 100 μM arabinose, with or without 150 mM NaCl, at 37°C. When cultures reached an A600 of 0.8, rifampicin was added. Cells were harvested at 10 min intervals for a period of 40 min. Whole cell cultures (10 μl) were analysed by Western blot using anti-InvE and -IpaB antibodies.