Western blot analysis (for conditions see
Materials and Methods) of E. coli SCS1 cell extracts (2
μl/lane) in the absence (left) or the presence (right) of
traF. Plasmids used are as follows. Lane a, pMS119EH
(vector); lane b, pRE178 (trbC+); lane c,
pRE178Δ3 (trbCΔ3+); lane d,
pRE178Δ3.05 (trbCΔ3.05+); lane e,
pRE178Δ3.1 (trbCΔ3.1+); lane f, pRE178Δ4
(trbCΔ4+); lane a′, pJH472
(traF+) and pMS119EH (vector); lane b′, pJH472
(traF+) and pRE178
(trbC+); lane c′, pJH472
(traF+) and pRE178Δ3
(trbCΔ3+); lane d′, pJH472
(traF+) and pRE178Δ3.05
(trbCΔ3.05+); lane e′, pJH472
(traF+) and pRE178Δ3.1
(trbCΔ3.1+); lane f′, pJH472
(traF+) and pRE178Δ4
(trbCΔ4+). Standard molecular mass markers
(Rainbow labeled markers, low range; Amersham Pharmacia Biotech): Lys,
lysozyme (14.3 kDa), and Apr, aprotinin (6.5 kDa). Positions of the
145-aa PreProTrbC, N-terminally cleaved ProTrbC, N- and C-terminally
processed TrbC∗, and (circular) pilin (TrbC) are indicated on the
right side of the figure.