Schematic of proteins used to trap a late stage folding intermediate of EspP on BAM: SurA. The complex was purified directly from E. coli membranes. The location of cysteine residues on 1 of BamA (S425C) and 12 of EspP (S1299C), the latter of which is concatenated to the C-terminus of SurA via its natural 76 residue N-terminal linker, are shown (not to scale).
