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. 2016 Oct 31;6:35860. doi: 10.1038/srep35860

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Vitamin B-12 transport by Ton-B dependent systems occurs closely to reactions of the 1,2-propanediol degradation pathway, which is confined by BMC-shell like proteins. BMC-A encoded proteins are shown in blue color. Proteins are localised based on prediction (all but the BMC-shell marker), microscopic evidence (of BMC, and ExbD*) and literature (TonB-dependent transport system, Pdu proteins). OM, outer membrane; CM, cytoplasmic membrane; TBDT, TonB-dependent transporter; hp, hypothetical protein; unchar.exo.sacch, uncharacterized protein exopolysaccharide synthesis. Propenediol degradation pathway and localization of Pdu proteins relative to BMC-shell is assumed based on characterized BMCs⁴¹.