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(A) Surface view of the AcrB reconstruction. Clear 3-fold symmetry can be seen from the base ((B) (cytoplasmic face)) and top ((D) (periplasmic face)) of the structure. Fitting of the AcrB crystal structure (PDB ID : 1IWG; [24]) into the reconstruction showing the excellence of fit as seen from the side (E) and top (F). Extra density can be seen surrounding the transmembrane domain of the AcrB structure, which is accounted for by the SMA/phospholipid envelope.
