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. 2015 Feb 25;9(2):65–67. doi: 10.1080/19336950.2015.1017172

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© 2015 The Author(s). Published with license by Taylor & Francis Group, LLC

This is an Open Access article distributed under the terms of the Creative Commons Attribution-Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted.

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Figure 1. — (A–C) Schematic representations of channel- and alternating access based solute transporters (a and b, resp.) and a polypeptide carrier (C). (D) Cross-section of the CsgG nonamer (PDB entry: 4UV3), cut-out of the Phe-ring region and schematic model of proposed secretion mechanism. (E) Idem for the theoretical model of the PA₆₃ octamer in pore conformation (PDB entry: 1V36). CTS: co-transported solute, ATP: adenosine triphosphate, ΔΨ electric potential, HB: H-bond donor/acceptor, ϕ: Phe-ring, ΔS: entropy potential, OM: outer membrane, EM: endoplasmic membrane.