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. 2015 Jul 7;5:11927. doi: 10.1038/srep11927

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(A) Cut-away cartoon models viewed from the side, showing the barrel-occluding N-terminal domains. (B) Internal surfaces of the channels. The hydrophobic part of the OM is shown as a grey bar of ~25 Å wide (C). Surface views from the side, with residues in the Pput2725 lateral patch and on both sides of the TodX lateral opening colored green. The hydrophobic part of the OM (M) is delineated by horizontal lines. In all panels, Pput2725 and TodX are drawn to scale. (D) Possible models for substrate transport by COG4313 channels. Transport may occur either via a “classical” channel through the N-terminal domain into the periplasmic space (left), or via a lateral opening into the OM (right).