Fig. 5.
The SecM signal peptide specifies intermediate targeting kinetics. MC4100 were transformed with a plasmid (pHL36, pMY10-11) encoding the indicated HA-tagged OmpA derivative. Cells were subjected to pulse-chase labeling after the addition of IPTG and immunoprecipitations were performed using anti-HA and anti-OmpC antisera. p, precursor; m, mature. A separate aliquot of cells transformed with pHL36 was removed and treated with 2 mM sodium azide (NaN3) 2 min prior to labeling to show the position of the OmpC precursor.