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. Author manuscript; available in PMC: 2009 Dec 1.
Published in final edited form as: Curr Opin Struct Biol. 2008 Nov 5;18(6):726–733. doi: 10.1016/j.sbi.2008.09.007

Figure 1. Alternating-access in ABC importers.

Figure 1

A. Structures of the inward-facing molybdate/tungstate transporter AfModBC-A (left) and the outward-facing maltose transporter MalFGK2-E (right). For each, the binding protein is colored in purple, the transmembrane subunits are colored in blue and yellow, and the ATPase subunits are colored in red and green. Translocation substrates, tungstate and maltose, are shown in CPK format while ATP is shown in ball-and-stick format. B. A model for alternating-access in ABC importers, modified from [8].