Figure 1: Structure of the A. borkumensis YdaH transporter.
From: Crystal structure of the Alcanivorax borkumensis YdaH transporter reveals an unusual topology
(a) Transmembrane topology of A. borkumensis YdaH. The transporter contains nine transmembrane helices (TMs) and two hairpins (HPs). (b) Ribbon diagram of a dimer of YdaH viewed in the membrane plane. The right subunit of the dimer is coloured using a rainbow gradient from the N terminus (blue) to the C terminus (red), whereas the left subunit is coloured grey. The YdaH dimer forms a bowl-shaped structure with a concave aqueous basin facing the intracellular solution. (c) Surface representation of the YdaH dimer sliced through the middle of the protein. Each protomer forms an internal cavity (red arrow), which is accessible to the cytoplasm. (d) Bottom view of a surface representation of the YdaH dimer, indicating a solvent accessible cavity (red circle) from each protomer of the protein. The two protomers are coloured gray and blue.
