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. 2014 Apr;143(4):419–435. doi: 10.1085/jgp.201411164

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© 2014 ter Beek et al.

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Figure 4. — Arrangement of the membrane helices in ABC transporters. Viewpoints are from the outside (trans-side) along an axis perpendicular to the membrane plane. (A) The MalF and MalG subunits of the maltose transporter MalEFGK₂, (B) the BtuC dimer of the vitamin B₁₂ transporter BtuC₂D₂F, (C) the EcfT subunit (yellow) and the S-component from the ECF-HmpT transporter, and (D) the membrane domains of the TM287 and TM288 subunits of the exporter from T. maritima. TM helices are numbered according to their occurrence in the sequence, with the one located most closely to the N terminus numbered as 1. The two coupling helices in the EcfT subunit are labeled X1 and X2.