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. 2014 Jun 5;9(6):e97903. doi: 10.1371/journal.pone.0097903

Figure 3. Sequence and topology of MtrD, AcrB and MexB.

Figure 3

Alignment of the amino acid sequences of MtrD, AcrB and MexB were done using CLUSTAL W (*, identical residues; :, >60% homologous residues). Secondary structural elements are indicated: TM, transmembrane helix; Nα and Nβ, helix and strand, respectively, in the N-terminal half; Cα and Cβ, helix and strand, respectively, in the C-terminal half. The MtrE docking domain is divided into two sub-domains, DN and DC; whereas the pore domain is divided into four sub-domains, PN1, PN2, PC1 and PC2. The sequence and topology of MtrD are shown at the top.